Chevrolet Silverado / GMC Sierra. Service manual — part 259

Fig. 86: View Of Oil Fill Tube
Courtesy of GENERAL MOTORS CORP.

16. Remove the oil fill cap from the oil fill tube.

17. Remove the oil fill tube from the rocker cover, if required.

18. Discard the oil fill tube.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

19. Clean and inspect the rocker arm cover. Refer to Valve Rocker Arm Cover Cleaning and

Inspection.

Installation Procedure

IMPORTANT:

All gasket surfaces should be free of oil or other foreign
material during assembly.

DO NOT reuse the valve rocker arm cover gasket.

The valve rocker arm cover bolt grommets may be reused.

If the oil fill tube has been removed from the rocker arm
cover, install a NEW fill tube during assembly.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 87: View Of Oil Fill Tube
Courtesy of GENERAL MOTORS CORP.

1. Lubricate the O-ring seal of the NEW oil fill tube with clean engine oil.

2. Insert the NEW oil fill tube into the rocker arm cover.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Rotate the tube clockwise until locked in the proper position.

3. Install the oil fill cap into the tube.

Rotate the cap clockwise until locked in the proper position.

Fig. 88: Rocker Arm Cover Gasket
Courtesy of GENERAL MOTORS CORP.

4. Install a NEW rocker cover gasket (1) into the valve rocker cover lip.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2