Selami Kumru

Статьи автора Selami Kumru в блоге RSS Kumru Automotive.

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 октября 2026 г.Гидравлические шланги

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: 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 октября 2026 г.Стальные трубки

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 октября 2026 г.Топливные трубки и трубки форсунок

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: 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 сентября 2026 г.Стальные трубки

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: 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 сентября 2026 г.Гидравлические шланги

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: 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 сентября 2026 г.Стальные трубки

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: 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 сентября 2026 г.Топливные трубки и трубки форсунок

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: 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 сентября 2026 г.Гидравлические шланги

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: 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 августа 2026 г.Стальные трубки

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: 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 августа 2026 г.Гидравлические шланги

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: 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 августа 2026 г.Топливные трубки и трубки форсунок

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 августа 2026 г.Стальные трубки

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 августа 2026 г.Гидравлические шланги

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: 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 августа 2026 г.Фитинги и подбор

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: 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 августа 2026 г.Гидравлические шланги

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 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 июня 2026 г.Топливные трубки и трубки форсунок

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 июня 2026 г.Фитинги и подбор

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 июня 2026 г.Фитинги и подбор

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: 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 декабря 2025 г.Топливные трубки и трубки форсунок

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: 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 ноября 2025 г.Фитинги и подбор

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 октября 2025 г.Топливные трубки и трубки форсунок

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 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 августа 2025 г.Топливные трубки и трубки форсунок

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: 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 июля 2025 г.Топливные трубки и трубки форсунок

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.

Чертёж: треснувшая трубка форсунки, идущая от топливной рампы к форсунке, с надетой в качестве заплаты гильзой, но из-под заплаты продолжает капать дизельное топливо; под ней ждёт замены новая трубка, изогнутая так же; в лупе заплата в разрезе: трещина проходит сквозь стенку трубки от внутренней стенки наружу, а заплата остаётся снаружи

6 мая 2025 г.Топливные трубки и трубки форсунок

Можно ли отремонтировать треснувшую топливную или гидравлическую трубку?

Треснувшую трубку форсунки заменяют, а не ремонтируют. Почему не держат сварка, пайка и муфты и что меняется для подающих, обратных и гидравлических линий.

Чертёж: изогнутая трубка форсунки от топливной рампы к форсунке, посередине хомут; в лупе видна трещина, которая начинается сразу за гайкой

11 марта 2025 г.Топливные трубки и трубки форсунок

Почему трескаются трубки форсунок?

Не от давления, а от усталости: вибрация, монтажные напряжения и материал. Роль хомутов, порядок монтажа и почему треснувшую трубку не ремонтируют.

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 февраля 2025 г.Фитинги и подбор

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 января 2025 г.Топливные трубки и трубки форсунок

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.

Чертёж: одна и та же стальная труба в четырёх состояниях сверху вниз, между этапами стрелки: прямая труба, отрезанная в размер; труба с надетыми гайками и высаженным конусом на каждом конце; изогнутая труба; готовая трубка с колпачком на каждом конце. В лупе виден разрез конца трубы: высаженный конус, за ним гайка и открытое отверстие внутри

13 августа 2024 г.Топливные трубки и трубки форсунок

Как изготавливают трубку форсунки дизельного двигателя: от стальной трубы до готовой детали

Как изготавливают трубку форсунки: бесшовная труба, резка, конус, гибка, автофретирование, покрытие и очистка, с причиной каждого этапа.

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 июня 2024 г.Топливные трубки и трубки форсунок

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: 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 февраля 2024 г.Топливные трубки и трубки форсунок

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.

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