Chevrolet Silverado / GMC Sierra. Service manual — part 2138

Fig. 88: Compressing Valve Spring Using
Courtesy of GENERAL MOTORS CORP.

IMPORTANT:

With the components at room temperature, remove the
spark plugs from the cylinder head.

Mark, organize, or sort the cylinder head components for

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

1. Remove the spark plugs from the cylinder heads.

2. Use the J 8062 in order to compress the valve spring.

Fig. 89: Valve Stem Keys, Valve Spring Cap & Valve Spring
Courtesy of GENERAL MOTORS CORP.

assembly. Return the components to their original
location 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

3. Remove the valve stem keys (225).

4. Remove the valve spring cap (224).

5. Remove the valve spring (223).

6. Remove the valves (228).

7. Remove the valve stem oil seal (222). Refer to Separating Parts .

Fig. 90: Locating Cylinder Head Core Hole Plug
Courtesy of GENERAL MOTORS CORP.

8. Remove the cylinder head core hole plugs (216), 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. 91: Locating Coolant Temperature Sensor
Courtesy of GENERAL MOTORS CORP.

9. Remove the coolant temperature sensor (725) from the left cylinder head.

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