Removal and Replacement

REMOVAL - CRANKSHAFT MAIN BEARINGS
1. Remove the oil pan.
2. Identify main bearing caps before removal.

Fig.62:

3. Remove bearing caps one at a time. Remove upper half of bearing by inserting Special Main Bearing Tool C-3059 (Fig. 62) into the oil hole of crankshaft.
4. Slowly rotate crankshaft clockwise, forcing out upper half of bearing shell.

INSTALLATION - CRANKSHAFT MAIN
BEARINGS

NOTE: One main bearing should be selectively fitted while all other main bearing caps are properly tightened.

1. For main bearing fitting procedure, Refer to CRANKSHAFT MAIN BEARINGS - STANDARD PROCEDURE
2. Start bearing in place, and insert Main Bearing Tool C-3059 into oil hole of crankshaft (Fig. 62).
3. Slowly rotate crankshaft counterclockwise sliding the bearing into position. Remove Special Main Bearing Tool C-3059.

Fig.63:

4. Inspect main cap bolts for stretching (Fig. 63). Replace bolts that are stretched.

NOTE: The main cap bolts should be examined before reuse. Bolt stretch can be checked by holding a scale or straight edge against the threads. If all the threads do not contact the scale the bolt must be replaced (Fig. 63).

5. Install each main cap and tighten bolts finger tight.
6. Tighten number 1, 3 and 4 main cap bolts to 41 Nm (30 ft. lbs.) + 1/4 turn.
7. Rotate the crankshaft until the number 6 piston is at TDC.
8. To ensure correct thrust bearing alignment the following procedure must be done:
a. Move crankshaft all the way to the rear of its travel.
b. Then, move crankshaft all the way to the front of its travel.
c. Wedge an appropriate tool between the rear of the cylinder block and rear crankshaft counterweight. This will hold the crankshaft in its most forward position.
d. Tighten the # 2 thrust bearing cap bolts to 41 Nm (30 ft. lbs.) + 1/4 turn. Remove the holding tool.
9. Install oil pan.
10. Fill engine crankcase with proper oil to correct level.