Chevrolet Silverado / GMC Sierra. Manual — part 612

Courtesy of GENERAL MOTORS CORP.

3. Install the right cylinder head.

Fig. 124: Cylinder Head Bolt Tightening Sequence
Courtesy of GENERAL MOTORS CORP.

4. Install the NEW M12 cylinder head bolts. Reuse the M8 bolts.

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 .

2008 Chevrolet Silverado 1500

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

Tighten the M12 cylinder head bolts in three steps:

Tighten:

1. 1st step 50 N.m (37 lb ft)

2. 2nd step 80 N.m (59 lb ft)

3. 3rd step tighten 60 degrees using J 45059

4. 4th step tighten 60 degrees using J 45059

5. Install the M8 bolts.

Tighten: Tighten the M8 cylinder head bolts to 25 N.m (18 lb ft).

EXHAUST MANIFOLD INSTALLATION - LEFT SIDE

2008 Chevrolet Silverado 1500

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

Fig. 125: View Of Left Exhaust Manifold & Gasket
Courtesy of GENERAL MOTORS CORP.

1. Install the exhaust manifold gasket.

2. Install the exhaust manifold.

2008 Chevrolet Silverado 1500

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