Chevrolet Silverado / GMC Sierra. Service manual — part 2198

Fig. 46: View Of Pushrods
Courtesy of GENERAL MOTORS CORP.

4. Install the pushrods.

IMPORTANT: Ensure the pushrods seat properly to the valve lifter sockets.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

Fig. 47: Identifying Offset Intake Rocker Arm & Non-Offset Rocker Arm
Courtesy of GENERAL MOTORS CORP.

5. Install the rocker arms and bolts.

The intake rocker arms (1) have an offset design.

IMPORTANT:

Ensure the pushrods seat properly to the ends of the
rocker arms.

DO NOT tighten the rocker arm bolts at this time.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

Fig. 48: View Of Camshaft & Crankshaft Sprocket Alignment Marks
Courtesy of GENERAL MOTORS CORP.

6. Rotate the crankshaft until number 1 piston is at top dead center of compression stroke.

In this position, cylinder number 1 rocker arms will be off lobe lift, and the crankshaft

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

sprocket key will be at the 1:30 position. The camshaft and crankshaft sprocket alignment
marks (1, 2) will be in the 12 o'clock position. If viewing from the rear of the engine, the
additional crankshaft pilot hole, non-threaded, will be in the 10:30 position.

The engine firing order is 1, 8, 7, 2, 6, 5, 4, 3.

Cylinders 1, 3, 5 and 7 are left bank.

Cylinders 2, 4, 6, and 8 are right bank.

7. With the engine in the number 1 firing position, tighten the following valve rocker arm

bolts:

Tighten:

Tighten the exhaust valve rocker arm bolts 1, 2, 7, and 8 to 30 N.m (22 lb ft).

Tighten the intake valve rocker arm bolts 1, 3, 4, and 5 to 30 N.m (22 lb ft).

8. Rotate the crankshaft 360 degrees.

9. Tighten the following valve rocker arm bolts:

Tighten:

Tighten the exhaust valve rocker arm bolts 3, 4, 5, and 6 to 30 N.m (22 lb ft).

Tighten the intake valve rocker arm bolts 2, 6, 7, and 8 to 30 N.m (22 lb ft).

VALVE ROCKER ARM COVER INSTALLATION - LEFT SIDE

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado