Blog y artículos técnicos

Cómo se fabrican nuestras piezas, artículos técnicos y guías de aprovisionamiento para compradores mayoristas.

Drawing: a two-column comparison: on the left, under the heading “From Turkey”, a truck, and on the right, under “From China”, a ship loaded with containers, both approaching a loading ramp in the middle; on the ramp are a coiled hose with a fitting on each end and a bent steel tube; below, the two columns show the same four signs in the same order: a customs booth, a document, a vehicle and a wall clock; their names are written once in the middle: customs duty, document, mode of transport, time difference; the magnifier shows a plain document with placeholder lines and a blank stamp

14 de octubre de 2026Números OEM y aprovisionamiento

Sourcing hoses and tubes from Turkey or China: duty, transport and time difference

Four differences an EU buyer can check in official sources: customs duty, A.TR and origin, mode of transport, and the time difference.

Drawing: on the left a paper quality certificate with a seal and a signature, on the right a screen showing the lookup record of the same certificate; the record has three rows: who the certificate was issued to, for which address and scope, and its status today; the status row is marked in blue and reads active, the paper has no status row; an arrow from the certificate to the screen shows the comparison; the magnifier shows the number on the certificate above the number in the record, with a match sign between them

13 de octubre de 2026Números OEM y aprovisionamiento

How to verify a supplier’s IATF 16949 or ISO 9001 certificate

Where to verify a supplier’s IATF 16949 or ISO 9001 certificate, what to check on it, what non-accredited means, and what to do if it is not found.

Drawing: the boost hose that should sit on the turbo outlet pipe has come off its joint, the loose clamp has slipped sideways along the pipe and air is escaping through the gap; the turbo wheel is spinning too fast, soot has built up in the particulate filter on the exhaust line; the second hose, from the intercooler to the engine, is sound and its clamps are in place; the magnifier shows the separated joint: the pipe, the slipped clamp on it, the open end of the hose and the air escaping in between

12 de octubre de 2026Turismos y comerciales ligeros

Boost hose leak or burst: the symptoms, and does it damage the engine?

A burst or leaking boost hose costs power and brings a whistle and black smoke. The turbo and the DPF take the damage; a pressure or smoke test finds the leak.

Drawing: five stops on a single timeline running left to right: a technical drawing waiting for approval with a bent sample tube beside it, a bundle of tubes, crates waiting in a queue, a tube bending machine and a wrapped pallet; the first stretch of the line is blue and thick, and the bracket above it shows that this part is in the buyer’s hands; the magnifier shows the drawing with its approval box still empty, an hourglass and the sample tube

11 de octubre de 2026Números OEM y aprovisionamiento

What drives lead time on custom hose and tube orders?

What lead time is, what it is made of on a custom hose or tube order, which part the buyer controls, and how to have it written into a quotation.

Drawing: a thin jet of oil leaves a pinhole in the body of a hydraulic hose that is fixed to the machine with two clamps, hits a piece of cardboard standing beside the hose and leaves a stain; no hand holds the cardboard; the magnifier shows the pinhole in the hose wall and the point where the jet comes out

10 de octubre de 2026Mangueras hidráulicas

Hydraulic fluid injection injury: why a pinhole leak is dangerous and what to do in the first hour

A jet of oil under pressure can pierce skin. Why the wound misleads, what to do at once and how to look for a leak, from HSE and DGUV guidance.

Drawing: a turbocharger in section; the oil feed pipe is undone at the turbo and lifted clear, only a thread of oil reaches the turbo, and the shaft and bearings run dry and hot; the magnifier shows the filter inside the banjo bolt blocked with carbon

7 de octubre de 2026Tuberías de aceite del turbo

Blocked turbo oil feed pipe: symptoms, checks, and can you just clean it?

A blocked feed pipe has no symptom of its own. How to prove it at the pipe and at the turbo, and when a cleaned pipe is acceptable.

Drawing: four parts one below the other on the left: a bent steel pipe with a nut at each end, a straight steel tube of the same diameter without fittings, a hose with a fitting at each end and a small hydraulic cylinder; an arrow runs from each to a separate folder on the right: the bent pipe to the engine part folder, the straight tube to the steel tube folder, the hose to the rubber or plastic hose folder, the cylinder to the hydraulic cylinder folder; the magnifier shows the tariff code field on the tab of one folder, drawn as short dashes, not digits

6 de octubre de 2026Números OEM y aprovisionamiento

HS codes for injector pipes, hydraulic hoses and cab tilt parts: how to find the right one

Which HS heading covers injector pipes, hydraulic hoses, cab tilt cylinders and pumps, shown with published EU, Turkish and US customs decisions.

Drawing: two brake pipe ends side by side, shown cut down the middle; on the left a double flare, an open funnel whose rim is folded inward into two layers, on the right a bubble flare with a domed end, each with a nut slid onto the pipe behind it; the magnifier shows the domed end held in a double flare port, with the gap left between them marked in red

5 de octubre de 2026Tubos de acero

Brake line flare types: SAE double flare vs DIN / ISO bubble flare

A brake pipe ends in an SAE double flare or a DIN / ISO bubble flare. How to tell them apart, why they do not mix, and which flaring mistakes leak.

Drawing: the path of the fuel, left to right: tank with a vent hole in its cap, suction pipe, lift pump bolted to the engine (priming lever on top, glass sediment bowl and strainer underneath), filter and injection pump; the outlet pipe of the lift pump is disconnected and fuel runs from the outlet into a container; the magnifier shows the inside of the pump: spring, diaphragm, inlet and outlet valves, with a split in the diaphragm marked in red

3 de octubre de 2026Tuberías de inyección y combustible

Diesel lift pump: what it does and how to tell when it is failing

What a diesel lift pump does, the symptoms of a failing one, flow and pressure tests from two tractor manuals, and how to tell pump from line.

Drawing: engine on the left, radiator in the middle, coolant reservoir on the right; a thin overflow hose runs from the pressure cap on top of the radiator down into the reservoir, and the arrows beside it show coolant going to the reservoir when hot and back to the radiator when cooling; the upper radiator hose between the engine and the radiator has collapsed in the middle and is marked in red; the magnifier shows the cap in section: a large spring-loaded pressure valve with a small vacuum valve in its centre

30 de septiembre de 2026Turismos y comerciales ligeros

Bad radiator cap symptoms: what pressure it should hold, and why hoses swell or collapse

How to spot a failing radiator cap, what pressure it should hold, why hoses swell or collapse, and how a cap is tested.

Drawing: an old-type farm tractor from the side in pale outline; four lines leave the steering unit under the steering wheel: the T line returns to the oil tank at the front of the engine, the P line comes from the pump, and the L and R hoses go to the two ends of the steering cylinder at the front axle; the L and R hoses carry marking bands at their ends; the magnifier shows the four ports of the unit up close with the letters T, P, L and R

28 de septiembre de 2026Tractores

Fitting power steering to a tractor: hoses, pipes and which port goes where

Where the P, T, L and R ports of the steering unit go, which hose suits which line, what crossed lines do, and how to bleed on first start.

Drawing: an engine on the left and a plate-type oil cooler on the right; between them two blue hoses carrying coolant and two amber hoses carrying oil; oil drips from the crimp of the lower oil hose and has left a stain on the ground; the magnifier shows the inside of the cooler: oil passes into the coolant through a hole, marked in red, in the plate that separates the oil channel from the coolant channel

25 de septiembre de 2026Camiones

Oil cooler and transmission cooler line leaks: symptoms, oil in the coolant, and what happens if a line bursts

A leaking line puts oil on the outside; oil in the coolant points to a leak inside the cooler. Symptoms, what a burst does, and what to check.

Drawing: side view of a brake pipe and its line nut screwed into the end of a brake hose; a flare-nut wrench sits on the nut, the rust ring where the nut meets the pipe is marked in red, and a straight marker line is drawn along the pipe, with a red arrow beside it for the case where the pipe turns too; the magnifier shows two wrenches side by side: the open-end wrench presses on only two flats of the nut, the flare-nut wrench wraps almost all the way round it

23 de septiembre de 2026Tubos de acero

How to free a seized or rounded line nut on brake, fuel and turbo oil lines

A seized line nut is freed in order: clean, soak, flare-nut wrench, tighten a touch first. If the pipe turns or the nut rounds off, cut and replace the pipe.

Drawing: side view of a tractor unit with its cab tilted fully forward; behind it the cab’s drive position in dashed outline, above it the arc the cab travels, with top dead centre marked at the top of the arc; the tilt cylinder under the cab and the hand pump on the chassis; the magnifier shows the pump’s two-position selector valve set to tilt, with the pump lever fitted

22 de septiembre de 2026Camiones

How to tilt a truck cab: Mercedes-Benz, Volvo FH, DAF XG

How to tilt and lower a truck cab: preparation, selector valve, pumping and locking, with maker notes for Mercedes-Benz, Volvo FH and DAF XG.

Drawing: a short hydraulic hose assembly; both ends are seen from the side: the ferrule crimped onto the hose, with lengthwise die marks, and the fitting below it; the right-hand end sits between the two jaws of a pair of calipers: the jaws hold the crimped ferrule from both sides; the magnifier shows the same ferrule between the caliper jaws, with an arrow from jaw to jaw marking the crimp diameter

20 de septiembre de 2026Mangueras hidráulicas

How is a hydraulic hose assembly made? Skiving, crimping and checking the crimp

A hydraulic hose assembly is cut, skived, crimped and measured. Which ends need skiving, how the crimp diameter is checked, how the assembly is tested.

Drawing: a car seen from above; the brake fluid reservoir at the front and the pipes running from it to the brakes at the four wheels; an open service book in the middle with dotted arrows reaching out to the four wheels, and no order numbers on the wheels; the magnifier shows the bleed screw at one wheel: a clear hose pushed onto the screw, its end dipped in a jar of brake fluid, with air bubbles in the hose and in the jar

18 de septiembre de 2026Turismos y comerciales ligeros

How to bleed brakes: one person, two people, and the order on a car with ABS

Bleeding brakes after a hose or pipe change: the two-person pedal method, three one-person methods, wheel order and the scan tool step on cars with ABS.

Drawing: the path of the fuel, left to right: tank, primary filter, transfer pump bolted under the injection pump, secondary filter with a gauge on it, and the injection pump; the arrow below shows the order of checks, from the primary filter to the transfer pump; in the magnifier the gauge needle is in the red low zone, next to the blue zone for enough pressure

15 de septiembre de 2026Caterpillar

Cat fuel transfer pump: what it does, how it fails, and where it sits on the 3306, 3406 and C7

What the Cat fuel transfer pump does, where it sits on the 3306, 3406 and C7, how it fails, where pressure is read, and why the filter comes first.

Drawing: two brake pipes side by side, held to the chassis by clips; the coating of the upper steel pipe has blistered in places and the pipe is covered in red rust patches, while the surface of the lower copper-nickel pipe is clean; the magnifier shows the steel pipe in cross-section: rust has started where the coating is broken and the pipe wall has thinned there

13 de septiembre de 2026Tubos de acero

Copper-nickel or steel? Brake line materials and corrosion

Brake pipes are coated steel, copper-nickel or stainless; plain copper is never used. Where steel pipe rusts and how inspection grades the corrosion.

Drawing: a wheel seen from the side, with a hot brake disc and the caliper gripping it, and heat lines above the wheel; the flexible brake hose runs from the caliper to its mounting on the body and looks sound from outside; the magnifier shows the hose cut lengthwise: the outer cover is intact, the inner liner has bulged and narrowed the passage, the fluid gets through towards the caliper but the arrow in the return direction is cut off in front of the bulge

10 de septiembre de 2026Turismos y comerciales ligeros

Collapsed brake hose symptoms: a dragging wheel, pulling to one side, an overheated brake

A collapsed brake hose can trap pressure at one wheel: it drags, runs hot and the car pulls. The test that separates it from a seized caliper.

Drawing: four injectors side by side on top of an engine; a clear hose runs down from the return port on top of each injector into one of four clear chambers hanging side by side in front of the engine; in three chambers the fuel stands at the same level, in one it is clearly higher, and that chamber and its injector are marked in red; the magnifier shows the push-fit return connector on top of an injector with its clip and O-ring, and diesel seeping from the joint and dripping down the side of the injector

8 de septiembre de 2026Tuberías de inyección y combustible

Injector leak-off line: what it does, why it leaks, and when the injector is to blame

When a common-rail leak-off line leaks, check the clip and O-ring first. How a leak-off test is done, how to read it, and where the sources disagree.

Drawing: the rear half of an old farm tractor from the side; the lift arms at the back are down; the levers beside the seat and the dipstick on the side of the housing are blue, they are checked first; inside the housing, oil and the pump at the bottom, the upright standpipe rising from the pump and the small cap in front of the seat; the magnifier shows the O-ring and the back-up washer on the end of the standpipe, with the cap taken off and the pipe pulled up

7 de septiembre de 2026Tractores

Massey Ferguson 135 / 240 hydraulic lift not working: standpipe, O-rings and the order of checks

Lift will not raise, raises slowly or will not hold a load: levers, oil and implement first, then the standpipe O-rings, the pump last.

Drawing: two hydraulic hoses in side view, one above the other; the body of the damaged upper hose is wrapped in tape and held by two clamps, oil drips from the edge of the wrap, and a red cross stands next to it; the new hose assembly below has a crimped fitting at each end, with a blue tick next to it; the magnifier shows the edge of the wrap: the tear in the cover and the wire braid are still there under the tape, and oil seeps out of the tear

4 de septiembre de 2026Mangueras hidráulicas

Can you repair a hydraulic hose? When a repair is acceptable and when it is not

A hydraulic hose is not patched or spliced. Used ends stay out of a new assembly; tape and clamps are for low-pressure hose only, until it is changed.

Drawing: the same brake pedal drawn three times in side view: on the left a spongy pedal that springs, in the middle a low pedal resting close to the floor, on the right a pedal that sinks towards the floor while it is held; at the far right the brake hose running down to the wheel brake, and the magnifier shows the spot where the hose swells under pressure

2 de septiembre de 2026Turismos y comerciales ligeros

Spongy or sinking brake pedal: air, a hose or the master cylinder?

A spongy, a low and a sinking brake pedal are three different faults: air, a swelling hose, a leak or the master cylinder. What to check, in order.

Drawing: three stops from left to right joined by one dashed line: a pallet of wrapped cartons on a factory loading ramp, the same pallet being lowered onto a ship by a crane at the port of shipment, and a truck waiting at the port of destination; the place where risk passes is marked in red: the seller’s premises under EXW, on board the ship at the port of shipment under FOB and CIF; a blue bracket shows that under CIF the seller pays freight and insurance as far as the port of destination; the magnifier shows the moment the pallet comes down on the ship’s deck

30 de agosto de 2026Números OEM y aprovisionamiento

EXW, FOB and CIF explained: Incoterms® rules for parts importers

Who arranges freight, insurance and customs under EXW, FOB and CIF, where risk passes, and which rule fits cartons, pallets and part loads.

Drawing: two bends of the same steel tube side by side, seen from the side; on the left a wide-radius bend with an arrow from the centre of the arc to the tube centerline showing the bend radius, on the right a tight-radius bend whose outer arc has collapsed inward and whose inner arc has wrinkled, both marked in red; the magnifier shows the cross-section of the tight bend: an oval ring instead of a round one, thin on the outer side and thick on the inner side

28 de agosto de 2026Tubos de acero

Tube bend radius: minimum radius, ovality and wall thinning

Bend radius is measured to the tube centerline and stated in tube diameters. Bend too tight and the tube flattens, thins outside and wrinkles inside.

Drawing: at the top an old steel line with a nut at each end and a stained surface, and below it a new line with the same bends and the same ends; dashed lines align the bends of the two lines one above the other; beside them a drawing sheet showing only the plain outline of the line; the magnifier shows the nutted ends of the two lines one above the other, with the same end form and the same nut

25 de agosto de 2026Números OEM y aprovisionamiento

Discontinued lines: having a pipe made from a sample or a part number

How to have a discontinued or classic-vehicle injector, fuel or steering pipe made from a sample, drawing or part number, and why a minimum quantity applies.

Drawing: four hose ends side by side, seen end-on, each with a different clamp on it: a worm-drive clamp with its screw housing and screw head, a spring clamp with its two ends bent outward, a T-bolt clamp with its bolt and nut, and an ear clamp with its ear crimped shut; under each one its name and the hose it is found on; the magnifier shows, in a side view cut down the middle, the bulge on the fitting the hose slides over and the clamp seated just behind it

24 de agosto de 2026Mangueras hidráulicas

Hose clamp types: worm-drive, spring, T-bolt and where each one is used

Worm-drive, spring, T-bolt and ear clamps: which hose each one holds, why a clamp works loose and when it can be reused, with figures from maker documents.

Drawing: a flexible brake hose lying horizontally in the middle, with a thin straight line running along its length; its left end is connected to the corner of the caliper, its right end sits in the bracket on the body and is held by a clip; beyond the bracket are the steel brake pipe and its nut, the nut not yet tightened, with thread showing in the gap; the magnifier shows the bracket, the clip and the pipe nut up close, and a single arrow shows that the nut is tightened last

22 de agosto de 2026Turismos y comerciales ligeros

Replacing brake hoses: the order of work, how long it takes and what drives the cost

Replacing a brake hose: the order of work, the labour time in two carmakers’ documents, five cost items, and how the car brakes if a hose bursts.

Drawing: the path of the fuel in a single row, left to right: tank with the lift pump inside, filter, high-pressure pump and fuel rail; the needle of the gauge on top of the rail sits below the mark for the desired pressure; the low-pressure side from the tank to the pump is framed in blue as the place to check first, and the high-pressure pump is left for last; the magnifier shows a filter blocked with dirt, with little fuel coming out

19 de agosto de 2026Tuberías de inyección y combustible

P0087, fuel rail pressure too low: what to check on a common-rail diesel, and in what order

What P0087 means, when it sets, and the order of checks on a common-rail diesel: filters, low-pressure line, lift pump, pipes and injector return.

Drawing: two unions side by side at the same scale, shown cut down the middle; on the left a flared union, with the flared ends of two brake lines seated inside it behind the nuts; on the right a compression fitting, where only a ferrule ring squeezes each plain line end; the magnifier shows the ferrule and the plain line passing through the nut, with an arrow beside the line showing the direction in which it can separate

17 de agosto de 2026Tubos de acero

How to splice a brake line, and can you use a compression fitting on one?

Compression fittings do not belong on brake lines. A splice is cut back to sound tube, flared and joined with a flared union. What inspection rules say.

Drawing: a side view of the tractor’s rear hydraulic outlet facing the tip of the hose from the implement, with a red cross in the gap between them; the cylinder at the other end of the hose lies on the ground, warming in the sun; the magnifier shows the hose tip in section: the oil in the hose presses the check valve onto its seat and holds it shut

14 de agosto de 2026Mangueras hidráulicas

Hydraulic coupler won’t connect: how to relieve the pressure trapped in the hose

A coupler that won’t connect has oil under pressure behind it. How to relieve it on a tractor or skid steer, and why not to strike the tip.

Drawing: two brake hoses of the same length with the same end fittings, one above the other: the rubber hose on top is swollen under pressure, the steel braided hose below is not; the magnifier shows the weak point of the braided hose, where it enters the swaged collar

12 de agosto de 2026Turismos y comerciales ligeros

Braided brake lines vs rubber: are stainless steel brake hoses worth it?

Braided stainless brake lines shorten pedal travel but add no braking force. How they differ from rubber, what DOT means, where they fail.

Drawing: four fitting ends in section, side by side: banjo, tapered thread, flat face with O-ring, flared cone; on each one the place where it seals is marked in the same blue: the two washers on the banjo, the thread itself on the tapered thread, the O-ring in the face on the flat-face end, the cone faces on the flare; the magnifier shows two cones whose threads engage but whose angles differ, with a thin gap left between them

11 de agosto de 2026Racores y selección

Hydraulic fitting types: JIC, ORFS, BSP, NPT, metric, and 37° versus 45° flare

A fitting is identified by where it seals, not by its thread. JIC, ORFS, BSP, NPT and metric ends, why 37° and 45° flares do not mix, how to measure.

Drawing: a hydraulic clutch circuit in side view: on the left the pedal resting on the floor (its normal position in dashed lines), the master cylinder and its reservoir; on the right the slave cylinder and the release fork on the transmission housing; the clutch hose joining the two has a red tear in the middle with drops of fluid below it; the magnifier shows the fluid running out through the tear in the hose

9 de agosto de 2026Camiones

What happens when a clutch hose bursts, and how to bleed a hydraulic clutch (trucks included)

A burst clutch hose drains the fluid: the pedal drops and the gears will not engage. Bleeding afterwards by pedal, by pressure bleeder and on a truck servo.

Drawing: side view of a six-cylinder in-line diesel engine in the middle; the fuel line from the small tank on the left runs under the engine to a water separator with a drain valve underneath, then up to the transfer pump on the side of the engine; air bubbles that got in at the drain valve travel along the line towards the pump; the suction side, from the tank to the pump, is marked with a blue bracket under the line; the magnifier shows air being drawn in at a drain valve that is not shut tight

7 de agosto de 2026Caterpillar

Cat 3126, C7 or C9 not getting fuel, air in the fuel system: what to check and in what order

Cat 3126, C7 or C9 not getting fuel or losing prime: suction line, water separator, transfer pump, return check valve, and how to prime the system.

Drawing: side view of a section of an excavator boom and the boom cylinder; two hydraulic hoses run from the machine body to the cylinder. The upper hose leaves its fitting straight, its clamp sits on the straight section, the bend starts after that and the lay line on the hose runs straight. The lower, red hose is bent tightly directly behind its fitting and its lay line spirals; the magnifier shows oil spraying from the hose where it has burst at this tight bend

4 de agosto de 2026Mangueras hidráulicas

Why do hydraulic hoses burst on an excavator, and how do you replace one?

Why hydraulic hoses burst on an excavator, and the order for replacing one: relieve the pressure, remove, route, bleed the air and check for leaks.

Drawing: a hydraulic steering circuit; in the fluid reservoir, which has a steering wheel symbol on its cap, the fluid is below the minimum line; next to it the belt-driven pump, and at the bottom the rack with a bellows at each end; the pressure hose runs from the pump down to the rack and the return hose from the rack back to the reservoir; at the fitting on the pump end of the pressure hose there is a wet, cracked patch with one drop of fluid under it; the magnifier shows this patch

2 de agosto de 2026Turismos y comerciales ligeros

Heavy steering and power steering fluid loss: is it the hose, the pump or the rack?

Hydraulic steering turns heavy when fluid is lost, and fluid is only lost through a leak. How to rule out EPS and check hoses, pump and rack.

Drawing: at the top a plain tube bender seen from above, its tooling in blue; two arrows leave the machine, one down to a single bent steel tube on the left, one down to a batch of the same tube nested in a row on the right; below them the same set-up box is whole on the left and cut into thin slices on the right, one slice for each tube; the magnifier shows the bender tooling: the bend die, the clamp holding the tube and the tube bent around the die

30 de julio de 2026Números OEM y aprovisionamiento

What is MOQ? How a minimum order quantity is set for spare parts

What MOQ means, why manufacturers set a minimum order quantity, what sets it for custom hoses and tubes, what lead time depends on, and what to ask.

Drawing: a wheel and axle seen from behind; the chassis above, with a rigid brake pipe clipped beneath it; the flexible brake hose leaving the end of the pipe sags onto the axle and runs on to the brake caliper beside the wheel; the point of contact is marked in red; the magnifier shows the surface of the hose: on the left only cracks and chafe marks, on the right the outer cover worn through and the reinforcement (cords) showing beneath it

28 de julio de 2026Camiones

When does a brake hose need replacing? What counts as a defect at inspection

Inspection texts set no interval for a brake hose; they judge its condition. Exposed cords, bulging or a leak fail the test. Categories and a checking order.

Drawing: a hydraulic steering circuit; the steering gear, with its column and wheel on top, the pump and the fluid reservoir are joined by three lines: the supply line from reservoir to pump, the pressure line from pump to gear and the return line from the gear back to the reservoir; a bulge on the pressure line is marked in red, with fluid dripping from it; the magnifier shows the cracked, sweating surface of the hose

14 de julio de 2026Camiones

What happens when a truck power steering hose bursts? Replacement and bleeding

A burst hose drains the fluid and the assist goes; the truck still steers, heavily. Warning signs, what matters at replacement, and how to bleed.

Drawing: a fuel pipe running over the hot exhaust manifold on the side of an engine; diesel leaking from the fitting in the middle of the pipe drips onto the manifold, which is drawn in red and gives off heat; in the corner an inspection sheet with one line marked with a cross; the magnifier shows the drop hanging under the fitting and a piece of cardboard held beneath it to find the leak, with a wet patch on it

30 de junio de 2026Tuberías de inyección y combustible

Is a diesel leak dangerous, and will it pass inspection?

A diesel leak can ignite on hot parts and, under pressure, penetrate skin. How the MOT manual and Turkey’s defect table class it, and what to do.

Drawing: a banjo joint in section; a hollow banjo bolt passes through the ring end of the pipe and screws into the housing, with a washer on each face of the ring, and the oil comes from the engine along the pipe and through the bolt into the housing; the magnifier shows a new washer above an old one that took the imprint of the faces when it was tightened

16 de junio de 2026Racores y selección

Banjo bolts, washers and gaskets: copper or aluminium, reuse, and sealant

Banjo bolt washers are renewed every time, in the specified material, with no sealant. Copper versus aluminium, annealing, and why no general torque exists.

Drawing: two lengths of hydraulic hose of the same type, one above the other, one thin and one thick; a line of print, drawn as small boxes, runs along each of them; the pressure gauge beside the thin hose reads high and the one beside the thick hose reads low; the magnifier shows the four boxes of the layline: type, size, working pressure marked in red, and date of manufacture

2 de junio de 2026Racores y selección

How to read a hydraulic hose pressure rating: what the layline tells you

The layline gives type, size and working pressure. What 1SN, 2SN and 4SP mean, how pressure changes with size, and whether a 3000 psi hose will do.

Drawing: a discharge line falling without a dip from the compressor beside the engine to the air dryer on the chassis, with an air tank behind the dryer; the compressor is marked in red; the magnifier shows the line in cross-section: a thick layer of carbon coats the inner wall and only a narrow air passage is left in the middle

19 de mayo de 2026Camiones

Compressor discharge line: carbon, oil and slow air build-up

Carbon in the line between compressor and air dryer slows air build-up. Makers’ rules for length, bore and slope, when to replace it, what to check first.

Drawing: on a bench, the vehicle’s workshop manual and a cab tilt hand pump with its reservoir on top and the filler plug taken out; beside it two glass jars: clear oil in one, oil turned milky in the other, with water drops in it, marked in red; the magnifier looks into the reservoir through the filler opening: the oil covers the piston

5 de mayo de 2026Camiones

Cab tilt oil: which fluid goes in, and why it turns milky

Which oil goes in a cab tilt pump, is ATF allowed, and why does it turn milky? Fluids, level check and oil change from the makers’ own documents.

Drawing: the fuel path of an old-type tractor engine from left to right: tank, glass-bowl pre-filter, lift pump with lever, filter, injection pump and the injector fed by a steel pipe; the filter screw, pump screw and injector union are marked first, then, last, with a single arrow above them running from the tank to the injectors; the magnifier shows fuel with bubbles coming out around a loosened screw

21 de abril de 2026Tractores

Bleeding a tractor fuel system: Massey Ferguson and Ford

Bleed from the tank towards the injectors. Bleed points and order for the Massey Ferguson 240 and Ford 2000–5000, from the makers’ books.

Drawing: a bent steel pipe and a short hose with a fitting at each end on a bench; beside them a checklist with all five boxes ticked: where each operation is done, quality certificate, sample approval, batch records, customs document; next to the list a sealed certificate and a closed shipping carton with a blank label; the magnifier shows the sealed certificate with its scope section marked in blue

31 de marzo de 2026Números OEM y aprovisionamiento

Sourcing pipes and hoses from Turkey: how to evaluate a manufacturer

How to evaluate a pipe or hose manufacturer in Turkey from a distance: in-house processes, certificate checks, sample approval, A.TR and origin documents.

Drawing: a plain diesel engine seen from the side with a small identification plate on its valve cover; behind it stands a second engine that looks the same, with a plate in a different colour; the magnifier shows the plate: the top row holds the boxes of the serial number, the first three in another colour as the prefix; the bottom row holds the boxes of the arrangement number; the boxes are empty

17 de marzo de 2026Caterpillar

Identify your Cat engine before ordering parts: serial prefix and arrangement number

Where the serial number is on a Cat machine and engine, what the prefix tells you, and why the arrangement number decides which parts fit.

Drawing: a cylinder in section; the piston inside the liner and, below it, the cooling jet with its thin tube, bolted to the block; the oil stream leaves the tip of the tube and enters the inlet port in the underside of the piston; the magnifier shows two cases side by side: the stream from a straight tube enters the port, the stream from a bent tube misses it

24 de febrero de 2026Caterpillar

Cat piston cooling nozzle: what it does, alignment, and what happens when it blocks

What a Caterpillar piston cooling nozzle does, why its aim matters, what a bent or blocked jet does to the piston, and what to check on a 3406.

Drawing: a tractor unit with its cab lowered; on the chassis a hand pump with its lever moving, a full reservoir on top and two hoses running from the pump to the cylinder; the magnifier shows air bubbles in the oil inside the hose

9 de febrero de 2026Camiones

How to bleed a cab tilt pump

A lever that moves while the cab stays put means air or low oil. The manufacturers’ bleed sequences, the reservoir rule and the safety points.

Drawing: a plain truck on the left, labelled vehicle series; arrows fan out from it to the right, each to an injector pipe bent to a different shape; a small number tag is tied to every pipe, with the numbers drawn as short dashes, not digits; the magnifier enlarges one tag and shows the same number written two ways, one above the other: run together on top, split into groups with spaces below

27 de enero de 2026Números OEM y aprovisionamiento

Mercedes injector pipe part numbers: which number fits which vehicle series?

How Mercedes-Benz injector pipe numbers are written, where to find them, and which number matches which truck, bus and van series.

Drawing: a line with no part number lying on a bench, with a nut at each end and three bends; a thread pitch gauge sits in the mouth of one nut, the jaws of a caliper grip a straight leg, a rule beside the line measures between the corners of two bends, and one of those bends carries an angle mark; the magnifier shows the cone end with its nut, the seat marked in blue

13 de enero de 2026Números OEM y aprovisionamiento

How to identify a line with no part number: nut thread, seat, diameter, length, bends

How to describe an injector, fuel or oil line with no readable part number: tube diameter, nut thread, seat type, length, bends and what to send with them.

Drawing: the path of the fuel on a diesel engine, left to right: tank, filter with a bleed screw on top, high-pressure pump, fuel rail and injector; the low-pressure side from the tank to the pump is marked, and the nut of the high-pressure line running from the fuel rail down to the injector is marked in red; the magnifier shows fuel with bubbles coming out around the loosened bleed screw

4 de diciembre de 2025Tuberías de inyección y combustible

How to bleed a diesel fuel system after a filter or line change

Mechanical pump: bleed screw, hand primer, then the line nuts. Common rail: the electric pump fills the system and the high-pressure lines stay tight.

Drawing: a turbocharger seen from the exhaust side and the steel oil feed line that leaves the engine, runs right beside the turbo and joins the top of it with a banjo bolt; heat radiates from the turbo, a heat shield wraps the part of the line nearest the turbo, there is burnt oil residue on the turbo housing and the pipe is dry; the magnifier shows the banjo end in section: the O-ring where the pipe enters the banjo is marked in red, with a fine oil mist around it

18 de noviembre de 2025Tuberías de aceite del turbo

Mini Cooper S (R56, N14) turbo oil feed line leak: why it leaks and what to check when replacing it

On the N14 the turbo oil feed line leaks at the O-ring joint on its banjo end. Signs, effect on the turbo, the heat shield bulletin and replacement.

Drawing: two hoses taking the same turn, one inside the other, each with a fitting at both ends; the upper one, a steel-braided PTFE hose, passes a hot part that gives off heat and takes the turn in a wide bend, while the rubber hose below takes the same turn more tightly; the magnifier shows a PTFE hose bent too sharply, in section: the liner has collapsed inwards at the bend and narrowed the passage

4 de noviembre de 2025Racores y selección

PTFE hose or rubber hose? Temperature, fluid, bending and service life

What temperature a PTFE hose takes, why it kinks, why fuel needs a conductive liner and how long it keeps on the shelf, set against rubber hose.

Drawing: the suction side of a fuel system, left to right: tank, the pipe leaving the tank, a rubber hose with two clamps, filter, a clear hose and the pump; the loose clamp, the crack in the hose and the filter seal are marked in red, blue arrows show air getting in at those points, and bubbles travel along the clear hose towards the pump; the magnifier shows air being drawn in through a hairline crack in the wall of the hose, with bubbles in the fuel

30 de octubre de 2025Tuberías de inyección y combustible

Air in a diesel fuel line: hard starting caused by pipes and hoses

When air keeps coming back, look for a leak: hoses, clamps, filter seals or the return line. The symptoms, and four ways to find where it gets in.

Drawing: a tractor unit with its cab tilted forward; the tilt cylinder under the cab, the hand pump on the chassis and the two hoses between them; the magnifier shows the push and pull hoses at the cylinder

23 de septiembre de 2025Camiones

Cab tilt hoses: choosing the right one, replacing it, and which end goes where

The two hoses do different jobs and cannot be swapped. Finding a hose by OE reference, a table of lengths and threads, replacement steps and the bleed sequence.

Drawing: a turbocharger housing and a piston side by side on a bench; the nameplate on the turbo housing is enlarged in the magnifier and carries two number lines, one above the other: the vehicle maker’s number and the supplier’s number; on the piston the part number is marked on the crown and the casting number on the skirt, with a note that it is the number of the rough part; the numbers are shown as short dashes, not digits

9 de septiembre de 2025Números OEM y aprovisionamiento

What is an OEM part number, where is it written, and how do you find a part by it?

What an OEM (OE) part number is, where it sits on the part, how it differs from casting and supplier numbers, and how to search a catalogue by it.

Drawing: a high-pressure pump on the left, an injector on the right and, between them, a jacketed fuel pipe that looks like one thick pipe; a window opened in the pipe shows the thin high-pressure pipe inside it and a crack in that pipe; a thin leak-off line runs from the lower end of the pipe down to a small collecting tank, and a red alarm lamp is lit beside the tank; the magnifier shows the cracked high-pressure pipe, the outer pipe around it and the fuel from the crack staying inside the outer pipe

26 de agosto de 2025Tuberías de inyección y combustible

Jacketed (double-wall) fuel injection pipes on marine diesel engines: what SOLAS requires

SOLAS wants the high-pressure fuel pipes between pump and injector jacketed. The rule’s wording, which ships it covers, the 375 kW exception and upkeep.

Drawing: a single turbocharger in section, drawn without its pipes or the engine; four causes are written on its four sides: dirty oil, a foreign object from the intake or the exhaust, overspeed and a dry first start; the magnifier shows the air-side wheel from the front, with a blade chipped by a nut that got in

12 de agosto de 2025Tuberías de aceite del turbo

The new turbo failed again: what to check besides the oil pipes

A turbo that fails again with new oil pipes was killed by something still on the engine: dirty oil, debris, overspeed or a dry first start.

Drawing: an injection pump on the left and four injectors in a row on the right; one line runs from the pump to each injector, the line to the near injector loops around on its way and the line to the far injector goes straight there; below, the same four lines are drawn straight with their ends level, all four the same length; the magnifier shows a shortened line that does not reach its seat, leaving a gap

15 de julio de 2025Tuberías de inyección y combustible

Why are injector lines the same length? Can they be shortened or bent?

Why injector lines are made the same length, and why they are not shortened or bent: Bosch’s rule on line dimensions and Perkins’ advice on fitting.

Drawing: a tractor unit with its cab stuck part-way; the places to check are marked in order: cab lock, selector valve, oil level and, last, the hand pump; the magnifier shows the tilt cylinder in section with oil leaking past the piston

19 de junio de 2025Camiones

Cab won’t tilt, won’t lower or creeps down: pump, cylinder or hose?

Which part is at fault when a cab will not tilt, lower or hold? A symptom table, the pump pressure test and the rule that spares the pump.

Drawing: on the left an open cardboard box with its flaps up and no printing or label on it; beside it two steel injector lines standing side by side: the old line with a stained surface, and the new line of the same length with the same bends and a protective cap on each end; dashed lines match the bends of the two lines, and the place where the clamp sits is marked on both; the magnifier shows one end of the new line with its cap taken off: the nut, the cone and the open hole through it

20 de mayo de 2025Caterpillar

Buying an injector or fuel line for a Caterpillar engine: what to check

What to check when you buy a line for a Caterpillar engine: the right number, capped ends, the cone, the old line, clamps, paperwork, first start.

Drawing: a cracked injector line running from the fuel rail to the injector, patched with a sleeve, yet diesel keeps dripping from under the patch; below it a new line bent to the same shape waits to take its place; the magnifier shows the patch in section: the crack runs through the wall of the line from the inner wall to the outside, and the patch stays on the outside

6 de mayo de 2025Tuberías de inyección y combustible

Can a cracked fuel or hydraulic line be repaired?

A cracked injector line is replaced, not repaired. Why welding, brazing and unions fail, and what changes on supply, return and hydraulic lines.

Drawing: the top of an in-line diesel engine with the valve cover shown cut open; the outer line from the pump joins an adapter in the head with a nut, the adapter passes through the head, and under the cover a short inner line joins the adapter to the injector; fuel leaking at the outer nut runs down the side of the engine, while fuel leaking at the inner end stays under the cover; the magnifier shows the O-ring at the end of the inner line where it enters the adapter, with fuel seeping past it and dripping

8 de abril de 2025Caterpillar

Cat 3406B and 3406C injector line leaking at the head: O-ring, inner line and bleeding

On the Cat 3406B and 3406C the injector line passes through an adapter in the head. Where to look for the leak, what the O-ring does, how to bleed.

Drawing: a bent injector line running from the fuel rail to the injector, with a clamp at mid length; the magnifier shows a crack starting right behind the nut

11 de marzo de 2025Tuberías de inyección y combustible

Why do injector lines crack?

Not from pressure but from fatigue: vibration, assembly strain and material. What the clamps do, the right fitting order, and why a cracked line is never repaired.

Drawing: a single hydraulic hose in side view, gently curved, with a fitting at each end; three signs of damage are marked in red along it, from left to right: a section where the cover is worn away and the wire braid shows, a blister, and fine cracks; the magnifier shows the right-hand end: the hose has slipped out of the ferrule, leaving its old seat exposed, and a drop of oil hangs at the end of the ferrule

11 de febrero de 2025Racores y selección

When to replace a hydraulic hose: the failure signs

The signs that a hydraulic hose must be replaced and what causes them, DGUV’s 6-year guide value, and why a leak is never traced by hand.

Drawing: an injector line running from the fuel rail to the injector, with diesel dripping from behind the nut at the injector end; the magnifier shows the inside of the nut: the cone on the line sits in its seat metal to metal, with no gasket, and a scratch on the sealing face lets the fuel out

15 de enero de 2025Tuberías de inyección y combustible

Injector line leaking at the nut: tighten, clean or replace?

More torque is not the fix. Check the torque once, then the sealing faces and the alignment; on common rail fit a new line. The order of work.

Drawing: three injectors side by side on top of a tractor engine with the thin leak-off line running across their tops; the two on the left are joined by a steel pipe with banjo bolts and washers, on the right short rubber hoses with clamps run between nipples, and the line goes back to the tank on the right; a crushed washer on the middle injector and a cracked hose end at the right-hand nipple are marked in red, with diesel dripping below them; the magnifier shows the cracked hose end with a new washer beside it

17 de diciembre de 2024Tractores

Tractor injector leak-off line leaks: hose, washer or injector?

When a tractor’s leak-off line leaks, check the hose, the clamps and the banjo washers first. What the line does, where to look and how to refit it.

Drawing: a turbocharger in section; the oil feed pipe comes up from the engine, runs over the hot exhaust side and reaches the shaft, the return pipe drains the oil back to the engine; the magnifier shows a pipe narrowed by carbon

18 de noviembre de 2024Tuberías de aceite del turbo

Should you replace the oil pipes when you fit a new turbo?

Yes. The feed pipe is renewed with every turbo; the return pipe is renewed or proven clear. Why, on which engines it is critical, and the order of work.

Drawing: three steps from left to right with two arrows between them: a riveted serial number plate, an open parts book in the middle and, on the right, a bent injector pipe with a nut at each end and a part number tag tied to it; one page of the book shows a plain diagram of four injector pipes, the other page holds lines of numbers; the magnifier shows two lines of the book: two separate numbers for the same cylinder, one used before and one after, with a small serial number plate on the dividing line between them; the numbers are shown as short dashes, not digits

22 de octubre de 2024Tractores

Finding the right pipe for a Massey Ferguson or Ford tractor by part number

Find the pipe by number, not model name: serial numbers, the parts book, what Massey Ferguson and Ford numbers look like, sets and single pipes.

Drawing: the path the air takes to the engine, from the air filter to the turbo, through the turbo hose to the intercooler and on to the engine; the crankcase breather hose leaves the engine, joins the intake between the filter and the turbo and feeds oil vapour into it; oil pooled in the bottom of the intercooler is marked in red; the magnifier shows the thin oil film on the inside of the turbo hose

8 de octubre de 2024Tuberías de aceite del turbo

Is oil in the turbo hose normal? Telling a normal film from a fault

Some oil is normal and comes from the crankcase ventilation. With pooled oil, blue smoke or oil consumption: the order of checks, turbo last.

Drawing: a turbocharger in section; the oil return pipe is narrowed at one point, so oil fills the bearing housing and seeps past both ends of the shaft into the exhaust side and the air side; the magnifier shows the seal ring on the shaft with oil passing it

3 de septiembre de 2024Tuberías de aceite del turbo

Turbo leaking oil and blue smoke: return pipe, seals or crankcase pressure?

A turbo that leaks oil is often sound. Return pipe, crankcase pressure, air filter, oil level; what oil at each end points to, and the order of checks.

Drawing: the same steel tube in four states from top to bottom, with arrows between the steps: a straight tube cut to length; the tube with its nuts on and a cone pressed on each end; the tube bent; the finished line with a cap on each end. The magnifier shows the end of the tube in section: the pressed cone, the nut behind it and the bore left open inside

13 de agosto de 2024Tuberías de inyección y combustible

How a diesel injection line is made: from steel tube to finished part

How a diesel injection line is made: seamless steel tube, cutting, cone forming, bending, autofrettage, coating and cleaning, with the reason for each step.

Drawing: above the threaded seat in the engine, two banjo bolts for the end of the oil feed pipe are shown side by side in section; one still has the small wire-mesh filter inside, the other has had it removed; either can go into the same seat; the magnifier shows the filter clean and starting to clog

24 de julio de 2024Tuberías de aceite del turbo

The banjo filter in the 1.6 HDi / TDCi turbo oil feed pipe: keep it or remove it?

Turbo suppliers, the vehicle maker’s service note and workshops disagree on the 1.6 HDi banjo bolt filter. Who says what, and what to do.

Drawing: a plain side view of an inline diesel engine and the path the fuel takes: tank, water separator, transfer pump, filter base, the supply line entering the head at the front of the engine, and the return line leaving the head at the rear and going back to the tank through the filter base; the suction side from the tank to the pump is blue, everything after the pump is amber; the magnifier shows the loose drain valve under the water separator and the air bubbles drawn in there, rising through the fuel

9 de julio de 2024Caterpillar

Cat 3406E and C15 losing prime or hard starting: a fuel line and return line checklist

A Cat 3406E or C15 that loses prime is checked on the suction side first. The fuel path, the valves, field tests and Caterpillar’s priming steps.

Drawing: an injector line removed from the injector and pulled back, its cone facing the empty seat in the injector; the magnifier shows a new cone above a used cone: the used one is marked and its bore has narrowed

13 de junio de 2024Tuberías de inyección y combustible

Can injector lines be reused once they have been removed?

On common rail most makers want a new pipe every time; on older mechanical engines a sound pipe goes back. How to judge the cone and when to scrap the pipe.

Drawing: an old-type farm tractor from the side in pale outline (large rear wheel with its fender, small front wheel, long hood, upright exhaust, steering wheel, seat); two steel pipes run down from the steering pump and its oil reservoir at the front of the engine to the steering cylinder at the front axle, with a short flexible hose at each end; oil drips from a nut at the pump, and the place of the clamp that holds the two pipes together is empty and marked in red; the magnifier shows the nut slid back and oil seeping from a hairline crack in the pipe right where the nut sat

21 de mayo de 2024Tractores

Tractor power steering line leaks: Ford 2000–5000 and Massey Ferguson 50 and 65

Check the connections, the steel pipe and the hose. Order of checks, clamps, topping up and bleeding, from Ford’s 2000–5000 service manual.

Drawing: a part tag tied to a pipe and, below it, the format of the part number as boxes: a digit, a letter, a dash and four digits; the same sequence is written again without the dash and the two are marked as the same number, with a note that a leading zero is never dropped; the magnifier shows two look-alike shapes: zero and the letter O

16 de abril de 2024Caterpillar

How to read a Caterpillar part number: 1W-7121 or 1W7121?

1W-7121 and 1W7121 are one number. What the dash, a leading zero and 0R mean, and why old and new Cat numbers have no cross reference table.

19 de marzo de 2024Números OEM y aprovisionamiento

Genuine, OEM, matching quality, aftermarket: what the spare-part terms mean

What genuine, OEM, OES, matching quality and aftermarket mean on a spare part: the official definitions and what to check.

Drawing: a fuel rail on top of the engine with steel high-pressure pipes running down to three injectors; the union of one pipe is wet, diesel has pooled at the foot of that injector, and a fine mist and a smell rise above the union; the diagnostic tool beside the engine shows no fault code; the magnifier shows a hairline crack in the pipe right next to the union, with diesel seeping from it

20 de febrero de 2024Tuberías de inyección y combustible

Common-rail pipe leak: symptoms and what to do

A leaking common-rail pipe shows as diesel smell, wet fuel or mist, sometimes with no fault code. Symptoms, risk and the order of work from maker documents.

Drawing: the fuel lines on a diesel engine with a mechanical injection pump; a thin blue low-pressure line leaves the tank on the left, passes the filter and the transfer pump and enters the injection pump in the middle; four dark, thick high-pressure lines leave the top of the pump, each bent to a different shape, and run up to the cylinder head; the thin line returning from the pump to the tank is drawn dashed; the magnifier shows the end of a removed line with a blank tag tied to it and a cap on its end

23 de enero de 2024Caterpillar

Cat 3208 and 3304 fuel lines: which line goes where, and how a 3304/3306 is bled

The fuel route from tank to nozzle and back on the Cat 3208 and 3304, what the book asks for when a line comes off, and bleeding a 3304/3306.

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