3408 TRUCK ENGINE Caterpillar

(17)Fuel Injection Nozzles

Whenever an engine performs in such a manner that a fuel injection valve is suspected of causing trouble, test all fuel injection valve by loosening the fuel injection line nut at the pump.

When a nut is loosened and the exhaust smoking is completely or partially eliminated and the irregularity in running is not affected, this identifies the probable location of a defective fuel injector.

Your authorized dealer has the proper tools for cleaning and testing fuel injection valves.

To Remove Injector:

1. Clean dirt from around valve cover and remove the cover.

2. Disconnect the clip and lead wire from the glow plug (PC only).

3. Remove the fuel injection line at the valve housing.

Immediately install plugs in the fuel line nuts to prevent dirt from entering the fuel injection line.

4. Remove the valve retainer nut, and nozzle assembly.

To Install:

1. Screw the valve body into the nozzle assembly.

2. Insert the nozzle assembly and valve body, as a unit, into the precombustion chamber.

3. Install the retainer nut and tighten to 55 lb.ft. (71 N·m).

4. Connect the fuel injection line and tighten. Install clip and lead wire to the glow plug (PC only).

5. Install the valve cover.

(18)Air Compressor

1. Inspect the performance of the air compressor.

2. Rebuild or replace the air compressor if needed.

3. Thoroughly inspect all connections. Before placing the vehicle in use, make certain all connections are tight.

(19)Engine Mounting Bolts

Tighten the engine mounting bolts. See the BOLT TORQUE CHART.

(20)Crankshaft Seal

1. Inspect for front seal leakage.

2. Inspect for rear seal leakage.

(21)Water Pump

1. Inspect the water pump. Rebuild it, or install a new pump if necessary.

Your authorized dealer is familiar with worn replacement limits and rebuild procedures.

(22)Vibration Damper

Inspect for separation of rubber ring between inner hub and flywheel ring.