Crankshaft Main Bearing
Main Bearing Clearance1. Remove the bearing caps and measure the oil clearance.
2. Remove the main bearing cap fixing bolts in the sequence shown in the illustration.
Arrange the removed main bearing caps in the cylinder number order.
Remove the main bearings.
3. Remove the crankshaft.
Remove the main bearings.
4. Clean the upper and lower bearings as well as the crankshaft main journal.
5. Check the bearings for damage or excessive wear.
The bearings must be replaced as a set if damage or excessive wear is discovered during inspection.
6. Set the upper bearings and the thrust washers to their original positions.
Carefully install the crankshaft.
7. Set the lower bearings to the bearing cap original position.
8. Apply plastigage to the crankshaft journal unit as shown in the illustration.
Note: Do not set the plastigage on the oil hole.
9. Install main bearing caps, oil gallery and crank case bolts in the order shown, and tighten each bolt to the specified torque.
Note: Do not apply engine oil to the crank case side bolts.
Main bearing cap bolts.
Torque: 39 Nm (29 ft. lbs.)
Oil gallery fixing bolts.
Torque:
1st step: 29 Nm (21 ft. lbs.)
2nd step: 55° - 65°
Crank case side bolts
Torque: 39 Nm (29 ft. lbs.)
Note: Do not allow the crankshaft to rotate.
10. Remove the main bearing caps in the sequence shown in the illustration.
11. Measure the plastigage width and determine the oil clearance. If the oil clearance exceeds the specified limit, replace the main bearings as a set and/or replace the crankshaft.
Standard: 0.019 mm - 0.043 mm (0.0007 inch - 0.0017 inch)
Limit: 0.08 mm (0.0031 inch)
12. Clean the plastigage from the bearings and the crankshaft. Remove the crankshaft and the bearings.