SHAFT 3T5851 - Caterpillar

Fuel leaked or spilled onto hot surfaces or electrical components can cause a fire.
Do not allow dirt to enter the fuel system. Thoroughly clean the area around a fuel system component that will be disconnected. Fit a suitable cover over disconnected fuel system component.
Fuel injectors are subject to tip wear. Tip wear is a result of fuel contamination. Tip wear can cause the following problems:
Increased fuel consumption
Black smoke
Misfire
Rough runningFuel injectors should be cleaned, inspected, tested, and replaced, if necessary. Refer to Special Instruction, SEHS7292 for using the 8S-2245 Injector Cleaning Tool Gp. Consult your Caterpillar dealer about cleaning the fuel injectors and testing the fuel injectors.
Never wire brush or scrape a fuel injection nozzle. Wire brushing or scraping a fuel injection nozzle will damage the finely machine orifice. Proper tools for cleaning and testing the fuel injection nozzles can be obtained from Caterpillar dealers.
The following items are symptoms of a malfunction of the fuel injectors:
Abnormal engine operation
Smoke emission
Engine knockEach fuel injector must be isolated one at a time in order to determine the malfunctioning fuel injector.
Start the engine.
Loosen each fuel line nut one at a time at the fuel injection pump. A cloth or similar material must be used in order to prevent fuel from spraying on the hot exhaust components. Tighten each nut before loosening the next nut.
A faulty fuel injector may be identified when a fuel line nut is loosened and the following conditions are present:
The exhaust smoke is partially eliminated or the exhaust smoke is completely eliminated.
Engine performance is not affected.A fuel injector that is suspected of being faulty should be removed. A new fuel injector should be installed in the cylinder in order to determine if the removed fuel injector is faulty.Removal and Installation of the Fuel Injection Nozzles
For the removal and the installation of fuel injectors, special tooling is required. Refer to the Service Manual for more information. Consult your Caterpillar dealer for assistance.