Furkan Kumru

Статьи автора Furkan Kumru в блоге RSS Kumru Automotive.

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 сентября 2026 г.Caterpillar

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: 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 августа 2026 г.Caterpillar

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: 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 марта 2026 г.Caterpillar

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 февраля 2026 г.Caterpillar

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.

Чертёж: слева открытая картонная коробка с поднятыми клапанами, без надписей и этикетки; рядом две стальные трубки форсунок бок о бок: старая трубка с пятнистой поверхностью и новая трубка той же длины с теми же гибами и защитным колпачком на каждом конце; штриховые линии сопоставляют гибы двух трубок, а место посадки хомута отмечено на обеих; в лупе виден один конец новой трубки со снятым колпачком: гайка, конус и открытое отверстие в нём

20 мая 2025 г.Caterpillar

Покупка трубки форсунки или топливной трубки для двигателя Caterpillar: что проверить

Что проверить при покупке трубки для двигателя Caterpillar: номера, колпачки, конус, сравнение со старой трубкой, хомуты, документы, первый запуск.

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 апреля 2025 г.Caterpillar

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 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 июля 2024 г.Caterpillar

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: 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 апреля 2024 г.Caterpillar

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.

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 января 2024 г.Caterpillar

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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