Crankshaft Main Bearings

Crankshaft main bearings (6333), crankshaft thrust main bearings (6337) and connecting rod bearings (6211) are selective fits. Refer to Section 03-00.

Removal

1. Drain the crankcase. Remove the oil level dipstick (6750). Remove the oil pan (6675), oil pump (6600) and related parts. Refer to Oil Pan/Oil Pump Screen Cover and Tube in the In-Vehicle Service portion of this section.

2. Replace one crankshaft main bearing or crankshaft thrust main bearing at a time, leaving other crankshaft main bearings securely fastened. Remove the crankshaft main bearing cap to which new crankshaft main bearings or crankshaft thrust main bearings are to be installed.

3. Insert Main Bearing Insert Tool TOOL-6331-E or equivalent in oil hole in crankshaft (6303).

4. Rotate the crankshaft in the direction of engine rotation to force crankshaft main bearing or crankshaft thrust main bearing out of block.

5. Clean the crankshaft journals. Inspect journals and thrust faces (crankshaft thrust main bearing) for nicks, burrs or bearing pickup that would cause premature bearing wear.

   
   
   
   
   

Installation

1. To install upper half of crankshaft main bearing or crankshaft thrust main bearing, place plain end of crankshaft main bearing or crankshaft thrust main bearing over crankshaft on locking tang side of cylinder block (6010) and partially install crankshaft main bearing or crankshaft thrust main bearing so Main Bearing Insert Tool TOOL-6331-E or equivalent can be inserted into oil hole in crankshaft. With Main Bearing Insert Tool TOOL-6331-E or equivalent in oil hole, rotate the crankshaft in the opposite direction of engine rotation until the crankshaft main bearing or crankshaft thrust main bearing seats itself. Remove the tool.

2. Fit the crankshaft main bearings or crankshaft thrust main bearings with Plastigage®. Refer to Section 03-00.

3. After the crankshaft main bearing or crankshaft thrust main bearing has been fitted, apply light coat of specified engine oil to journal and crankshaft main bearings or crankshaft thrust main bearings. Install the crankshaft main bearing cap. Tighten the crankshaft main bearing cap bolts to 129-142 Nm (95-105 lb-ft).

4. Repeat the procedure for remaining crankshaft main bearings or crankshaft thrust main bearings requiring replacement.

5. If the rear crankshaft main bearing is to be replaced, remove the rear crankshaft main bearing cap. Remove and discard the crankshaft rear oil seal (6701).

6. Clean rear journal oil seal groove and mating surfaces of cylinder block and rear crankshaft main bearing cap.

7. Install the new crankshaft rear oil seal. Refer to Crankshaft Rear Oil Seal in the In-Vehicle Service portion of this section.

8. Refer to Crankshaft Rear Oil Seal in the In-Vehicle Service portion of this section for procedure used in sealing the rear crankshaft main bearing cap. After sealing, install the rear crankshaft main bearing cap. Tighten rear crankshaft main bearing cap bolts to 129-142 Nm (95-105 lb-ft).

9. If thrust bearing cap (No. 3) has been removed, install as follows:

   1. Install the thrust bearing cap with bolts finger-tight.
   2. Pry the crankshaft forward against the thrust surface of upper half of crankshaft thrust main bearing.
   3. Hold the crankshaft forward and pry crankshaft thrust main bearing cap to rear. This aligns thrust surfaces of both halves of crankshaft thrust main bearing.
   4. Retain forward pressure on crankshaft.
   5. Tighten cap bolts to 129-142 Nm (95-105 lb-ft).
      
      Tightening Crankshaft Thrust Main Bearing Cap
      
      
      
      
      

10. Clean the oil pump screen cover and tube (6622). Prime the oil pump by filling the inlet opening with oil and rotate the oil pump intermediate shaft (6A618) until oil emerges from the outlet opening.

11. Install the oil pan and oil pump. Refer to Oil Pan/Oil Pump Screen Cover and Tube in the In-Vehicle Service portion of this section.

12. Fill the crankcase. Start the engine (6007) and check for oil pressure. Operate the engine at fast idle and check for oil leaks.