Component Checks

To withdraw the bearing caps, spread the engine block side walls using the engine block spreading tool (Refer to '303-664 (Crankshaft Rear Oil Seal Install)', page 20-1-5), tensioned to 25 Nm.

To avoid overstriking engine block walls, do not exceed 25 Nm. on engine block spreader bolt.

1. Remove the side bolts (x14).
2. Remove the outer bolts (x14) from the main bearing caps.

Record positions of the stud bolts at No. 3 and 6 main bearing caps.

1. Remove the inner bolts (x14) from the main bearing caps.

Retain all components in order for installation to their original locations, if serviceable.

9. Remove the crankshaft from the engine.
10. Remove the thrust washers from No. 4 main bearing.
11. Remove the upper bearing shells from all the main bearings.

If serviceable, retain all bearings, in order, for refitting to their original locations.

Component Checks

1. Examine the crankshaft journals for wear, scuffing or other defects. Replace the crankshaft if un-serviceable.
2. Examine all bearing shells and thrust washers for wear, scuffing or other defects. Replace if un-serviceable.
3. If required, measure the diameter of the crankshaft main and big end bearings.
   Compare results with data in engine specifications.
   • The finished diameter of crankshaft main bearing bores is indicated by numbers stamped on engine block face
   • The finished diameter of crankshaft main bearing journals are indicated by seven letters, stamped in bearing number sequence, on No.1 counter weight
4. Refer to Main Bearing Grade Chart in Engine Specifications if the main bearings are to be replaced.

Installation

1. Install the upper bearing shells and thrust washers (No 4 bearing). Check the oil feed hole alignment.

The thrust washers are installed with the groove facing the crankshaft.

2. Install the crankshaft into the upper main bearings.