Chevrolet Silverado / GMC Sierra. Service manual — part 1972

Fig. 263: View Of Pushrods
Courtesy of GENERAL MOTORS CORP.

4. Install the pushrods.

IMPORTANT: Make sure that 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. 264: View Of Rocker Arms & Bolts
Courtesy of GENERAL MOTORS CORP.

5. Install the rocker arms and bolts.

IMPORTANT: Make sure that the pushrods seat properly to the ends of the

rocker arms. DO NOT tighten the rocker arm bolts at this
time.

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

and 7 are the left bank. Cylinders 2, 4, 6 and 8 are the right
bank.

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

6. Rotate the crankshaft until the number one piston is at top dead center (TDC) of the

compression stroke. In this position, the number one cylinder rocker arms will be off lobe
lift.

7. With the engine in the number one firing position, tighten the following rocker arm bolts:

Tighten:

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

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

8. Rotate the crankshaft 360 degrees.

9. Tighten the following rocker arm bolts:

Tighten:

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

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

10. Install the number one cylinder spark plug. Refer to Spark Plug Replacement .

11. Install the rocker arm cover. Refer to Valve Rocker Arm Cover Replacement - Left Side

or Valve Rocker Arm Cover Replacement - Right Side.

VALVE STEM OIL SEAL AND VALVE SPRING REPLACEMENT

Tools Required

J 22794 Spark Plug Port Adapter

J 38606 Valve Spring Compressor

Removal Procedure

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

Fig. 265: View Of Spark Plug Wire & Boot
Courtesy of GENERAL MOTORS CORP.

1. Remove the rocker arm. Refer to Valve Rocker Arm and Push Rod Replacement.

2. Disconnect the spark plug wire at the spark plug.

Twist each plug wire boot 1/2 turn.

Pull only on the boot in order to remove the wire from the spark plug.

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