D379, D398, D399 INDUSTRIAL & MARINE ENGINES Caterpillar

start by:

a) remove fuel injection valves

1. Remove coolant from engine.

2. Remove precombustion chamber (1) with wrench (A).

3. Remove the gaskets from precombustion chambers.

Install Precombustion Chambers

1. Put 5P3931 Anti-Seize Compound on threads of the precombustion chamber (2).

2. Put a small amount of grease on gasket (3) to hold gasket on chamber.

3. Put liquid soap on the seal (1) and bore in the cylinder head.

4. Tighten precombustion chamber with wrench (A) to a torque of 225 ± 15 lb. ft. (300 ± 20 N·m).

5. Fill the engine with coolant to correct level.

end by:

a) install fuel injection valves