2008 6.6L Duramax – CRANKSHAFT AND BEARING INSTALLATION – Installation

1. Install the upper crankshaft bearings into the cylinder block. The bearing halves to be inserted into the crankshaft      main bearing saddle have a wide groove and oil hole in the center of the bearing (1).
2. Install the lower crankshaft bearings into the crankshaft bearing caps. The bearing halves to be inserted into the          crankshaft main bearing caps do NOT have an oil hole or groove in the bearing (2).

3. Install the upper thrust bearings to the cylinder block. There are two thrust bearings (1 and 3) in the cylinder                block and one lower thrust bearing in the No. 5 crankshaft bearing cap (2).
4. Lubricate the crankshaft bearing surfaces with engine oil.
5. Install the crankshaft into the cylinder block.
6. Install the No. 5 crankshaft bearing cap with the lower thrust bearing (2).

7. Install the remaining four crankshaft bearing caps.

8 . Install the NEW crankshaft bearing cap bolts.
9. Tighten the crankshaft bearing cap bolts in the proper sequence.
Tighten:
• 1st step 98 N.m (72 lb ft).
• 2nd step 132 N.m (97 lb ft).
• 3rd step 30 degrees using J 45059 .

10. Clean the crankshaft bearing side cap bolt threads, sealing flange and mounting holes with GM P/N 12377981              (Canadian P/N 10953463) or equivalent. Dry the bolts and mounting holes with compressed air.
11. Apply GM P/N 12346004 (Canadian P/N 10953480) to the threads and sealing flange of the bolts.
12. Install the ten bolts.
Tighten: Tighten the crankshaft bearing cap side bolts to 70 N.m (52 lb ft).

13. Install the oil pressure sensor.
Tighten: Tighten the oil pressure sensor to 41 N.m (30 lb ft).