Chevrolet Silverado / GMC Sierra. Service manual - part 51

Fig. 146: View Of Crankshaft Balancer Alignment Mark & Engine Front Cover
Alignment Tab
Courtesy of GENERAL MOTORS CORP.

5. Rotate the crankshaft balancer to position the crankshaft balancer alignment mark (1) 57-63

degrees clockwise or counterclockwise from the engine front cover alignment tab (2).

IMPORTANT: Once the rocker arms are installed and properly torqued, no

additional valve lash adjustment is required.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

6. Tighten the rocker arm bolts.

Tighten: Tighten bolts to 30 N.m (22 lb ft).

7. 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. See Special Tools.

J 38606 Valve Spring Compressor. See Special Tools.

J 5892-D Valve Spring Compressor. See Special Tools.

J 42073 Valve Stem Oil Seal Installer. See Special Tools.

Removal Procedure

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 147: Installing J 22794 Into Spark Plug Hole
Courtesy of GENERAL MOTORS CORP.

1. Remove the required valve rocker arms. Refer to Valve Rocker Arm and Push Rod

Replacement.

2. Remove the required spark plugs. Refer to Spark Plug Replacement .

3. Install the J 22794 into the spark plug hole. See Special Tools.

4. Connect a shop air supply hose and apply compressed air in order to hold the valves in

place.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 148: Installing J 5892-D Under Washer On Rocker Arm Bolt
Courtesy of GENERAL MOTORS CORP.

5. Install a flat washer onto the removed rocker arm bolt.

6. Install the bolt and rocker arm for the valve spring requiring removal.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado