58. Crankshaft and Bearing Installation

Crankshaft and Bearings Installation





Important: The upper main bearings have an oil groove and oil holes, the lower bearings do not have oil grooves or oil holes.

1. Install the upper main bearings into the cylinder block and lubricate with engine oil.





2. Install the lower main bearings into the lower crankcase and lubricate with engine oil.





Important: Install the upper thrust bearing washers (1) with the oil groove (2) facing outward.

3. Install the TWC upper thrust bearing washers into the cylinder block and lubricate with engine oil.





4. Carefully place the crankshaft (1) on to the main bearings in the cylinder block.





5. Thoroughly clean and remove any oil residue from the cylinder block mating surfaces.

Important: Avoid applying an excessive amount of sealant to the surface.

6. Apply a continuous bead of GM P/N i2345997 or equivalent sealant to the cylinder block mating rails.
7. Carefully place the lower crankcase assembly on to the cylinder block.
8. Gently tap the lower crankcase into place with a suitable tool.





Important: Gradual and uniform tightening is important for the lower crankcase bolts.

9. Install the long 8 mm bolt (3) finger tight.
10. Install the 8 mm bolts (2) finger tight.
11. Install the 10 mm bolts (1) finger tight.

Notice: Refer to Fastener Notice in Service Precautions.

12. Progressively torque the 10 mm main bearing cap bolts using TWC steps in the sequence shown.
1st Pass
- Tighten the main bearing cap bolts to 42 Nm (31 ft. lbs.).
2nd Pass
- Tighten the main bearing cap bolts to 58 Nm (42 ft. lbs.).
13. Progressively torque the lower crankcase bolts using TWC steps.
1st Pass
- Tighten the lower crankcase bolts to 19 Nm (14 ft. lbs.).
2nd Pass
- Tighten the lower crankcase bolts to 27 Nm (20 ft. lbs.).
14. Inspect that the crankshaft rotates smoothly by hand.