C3.4 Engines for Caterpillar Built Machines Caterpillar

Illustration 1	g00987933

(1) Cylinder bore

Bore the cylinder to the oversize dimension if the cylinder has uneven wear. Refer to Table 2.

The permissible distortion of the contact surface of the gasket is given below.

Maximum at assembly ... 0.05 mm (0.0020 inch)

Repair limit ... 0.20 mm (0.0079 inch)

(2) Main bearing cap bolts

Use the following procedure to install the main bearing cap bolts:

1. Apply clean engine oil to the bearings and install the bearings to the caps.

   Note: Apply Tooling (A) to the corners of the cylinder block for the rear main bearing cap. After the rear main bearing cap is installed, remove any excess sealant from the inside of the recess for the rear oil seal. Excess sealant prevents the correct seating of the rear oil seal.

2. Install the cap to the crankcase so that the rear face of the cap is even with the rear face of the crankcase.

3. Apply clean engine oil to the threads of the main bearing cap bolts.

   Tighten the main bearing cap bolts to the following torque. ... 98 to 108 N·m (72 to 80 lb ft)

Illustration 2	g01007113

(3) Rear main bearing cap

(4) Main bearing caps should have a marking that indicates placement and orientation.

(5) Front main bearing cap

Illustration 3	g01007117

(6) Seal for the front and rear main bearing caps.

(7) The seals for the front and the rear main bearing caps have a curve at one end. The curved side must be installed toward the side of the engine. The curved end is inserted first into the hole. Use Tooling (B) to correctly install the seals.

(8) Before installing the seals, inject a small quantity of Tooling (A) in the holes for the seals.

Illustration 4	g01353554

(9) Inside diameter of the lifter bore

Standard at assembly ... 14.000 to 14.018 mm (0.5512 to 0.5519 inch)

Service limit ... 14.100 mm (0.5551 inch)