Crankshaft Main Bearing

MAIN BEARING CAPS

CAUTION: There are different sets main bolts supplied with this engine. Each bolt set has a different torque value and engine damage could result if bolts are not torqued correctly. The bolts are not interchangeable.





If your bolt heads look like this (1,2), Go to step 1. If your bolt heads do not look like this (1,2), Go to step 2.




CAUTION: Before tightening bolts, you must identify the bolt head to obtain the correct torque value. Failure to identify the bolts correctly, could result in improperly tightened bolts which could result in engine damage.

1. Tighten bolts using a three step method, in the sequence shown.
- Tighten bolts to 15 Nm (11 ft. lbs.)
- Tighten bolts to 27 Nm (20 ft. lbs.)
- Rotate an additional 45°.

2. Tighten bolts using a three step method, in the sequence shown.
- Tighten bolts to 15 Nm (11 ft. lbs.)
- Tighten bolts to 45 Nm (33 ft. lbs.)
- Rotate an additional 45°.








STANDARD PROCEDURE - MAIN BEARING SELECTION

NOTE: There are three different possibilities for the upper main bearings and five different lower main bearings. The upper and lower bearing shells are not interchangeable.




The lower main bearing identification (2) is stamped in the nose of the crankshaft (3). There are 5 different bearing sizes available 0 through 4.







The upper main bearing shell identification (1) is located in the middle of cylinder block on the right side of the engine. There are three different size bearings available. The bearing class is read downward from top and corresponds to the front journal to the rear journal on the bottom.