SPROCKET 4304192 - Caterpillar

Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Start By:
Remove valve cover mechanism.
Back out the accumulator.
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Disconnect harness assembly (1).
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Remove bolt (2).
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Remove fuel/fluids from the cylinder. Turning over (cranking) an engine with a fuel injector removed could result in personal injury or death from fluids escaping at high velocity.
Use Tooling (A) to remove fuel injector (4) and injector clamp (3).Note: Only pry on the underside of injector clamp (3).Note: Plug the fuel inlet port on the fuel injector and place the fuel injector and the accumulator in separate sealed bags immediately upon removal. Using separate sealed bags will prevent contamination.Note: Plug the fuel injector port in the cylinder head.Installation Procedure
Wipe the high-pressure fuel inlet on the injector and the outlet of accumulator off with a clean towel. Wiping these areas will prevent potential debris from causing sealing problems.
Remove all carbon deposits from the angled surface at the bottom of the cylinder head bore for the fuel injector. Failure to clean this area may prevent the fuel injector from seating properly. This could result in failure of the fuel injector due to leakage of exhaust gas into the fuel passage.
Install fuel injector (4) in the reverse order of removal.
It is important to clean the cylinder head bore for the fuel injector before you install the fuel injector. Use the following procedure to clean the bore.Note: A fine grade of Scotch Brite material is recommended for cleaning the cylinder head bore for the fuel injector. The product is available as Tooling (F).
Place a 38 mm (1.5 inch) square piece of Scotch Brite material on the end of Tooling (B).Note: It should not be necessary to use a power tool to clean the cylinder head bore for the fuel injector.
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Hold the brush with Tooling (C). Insert the brush into bore (6). Rotate the Scotch Brite material against the lower surface of bore (7). Continue cleaning until the surface is smooth and shiny.Note: Tooling (D) is recommended for cleaning loose particles from the bore. The vacuum is operated with pressurized air.
Remove all loose particles from the bore.
Remove any fuel / fluid that may have accumulated before installing the fuel injector.
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Obtain new O-ring seals (8). Coat the O-ring seals and coat the cylinder head bore for the fuel injector with Tooling (E).Note: Press the fuel injector into the bore of the cylinder head. Do not strike the fuel injector. Center the solenoid between the valve springs.
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Fuel injector clamp (3) has orientation pads and alignment tab that fit onto machined injector slots. Fuel injector clamp (3) must be used to draw the fuel injector into the cylinder head bore.
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Tighten bolt (2) to a torque of 65 7 N m (48 5 lb ft).