Chevrolet Silverado / GMC Sierra. Manual — part 262

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

compression stroke.

In this position, cylinder number one rocker arms will be off lobe lift, and the crankshaft
sprocket key will be at the 1:30 position.

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

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

Cylinder 2,4,6 and 8 are the right bank.

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

bolts:

Tighten:

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

Tighten the 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 valve rocker arm bolts:

Tighten:

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

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

10. Install the valve 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

Special Tools

J 22794 Spark Plug Port Adapter. See Special Tools.

J 38606 Valve Spring Compressor. See Special Tools.

Removal Procedure

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2