Chevrolet Silverado / GMC Sierra. Service manual — part 2149

Fig. 120: View Of Valve Rocker Arm Cover
Courtesy of GENERAL MOTORS CORP.

1. Inspect the oil fill tube (423) for a loose fit or damage.

2. Inspect the covers (505) for the following conditions:

IMPORTANT:

Do not use the valve rocker arm cover gasket again.
Install a NEW gasket during assembly.

Remove the ignition coils before cleaning the cover in
solvent. Do not submerge the ignition coils in solvent.

Do not remove the oil fill tube from the covers unless
service is required. If the tube is removed from the
cover, install a NEW tube (423) and seal (422) during
assembly.

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

Scoring or damage to the gasket surfaces

Ventilation system passages for restrictions

Threaded bolt holes for damage or debris

OIL PAN CLEANING AND INSPECTION

Fig. 121: View Of Oil Filter Fitting
Courtesy of GENERAL MOTORS CORP.

1. Remove the oil filter fitting (438), as required.

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. 122: View Of Oil Pressure Relief Valve Components
Courtesy of GENERAL MOTORS CORP.

2. Remove the active fuel management oil pressure relief valve (455) and washer.

3. Inspect the oil pressure relief valve for proper operation. Lightly depress the valve (2). The

valve spring (1) should seat the valve to the proper closed position.

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. 123: View Of Oil Level Sensor & O-Ring
Courtesy of GENERAL MOTORS CORP.

4. Remove the oil level sensor (727) and O-ring (728).

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