Chevrolet Silverado / GMC Sierra. Service manual — part 600

Fig. 82: View Of Crankshaft Bearing Cap & Bolts
Courtesy of GENERAL MOTORS CORP.

7. Install the remaining four crankshaft bearing caps.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 83: Main Bearing Bolt
Courtesy of GENERAL MOTORS CORP.

NOTE:

This component uses bolts with a preapplied molybdenum
disulfide coating for thread lubrication. Do not remove the
coating or use any additional lubricant. Improperly lubricated
threads will adversely affect the bolt torque and clamp load.
Improper bolt torque and clamp load can lead to engine
damage.

NOTE:

Refer to Fastener Notice .

IMPORTANT: There are two different length crankshaft bearing cap bolts in

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

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 .

production depending on the counter bore of the threaded
hole/block. Using the wrong bolt may lead to improper thread
engagement, bottoming out or improper clamp load. Look at
the bolt head surface to determime which bolt was used in
production. The bolt head will have either a raised circle (1)
or it will be unmarked (2). Replace the bolt with the same
type.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 84: View Of Crankshaft Bearing Cap Side Bolts
Courtesy of GENERAL MOTORS CORP.

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).

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado