Chevrolet Silverado / GMC Sierra. Service manual — part 53

1. Assemble the valve into the proper valve guide.

2. Select the proper valve stem oil seal for the specific valve guide.

3. Lubricate the valve stem oil seal and the outside diameter of the valve guide with clean

engine oil.

4. Assemble the valve stem oil seal onto the valve stem.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 152: Valve Stem Oil Seal Proper Installation Position
Courtesy of GENERAL MOTORS CORP.

5. Using the J 42073 , install the valve stem oil seal onto the valve guide. See Special Tools.

1. Tap the valve stem oil seal onto the valve guide until the J 42073 bottoms against the

valve spring seat. See Special Tools.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

2. Inspect the valve stem oil seal. The valve stem oil seal should not be bottomed against

the valve guide.

There should be a 1-2 mm (0.03937-0.07874 in) gap between the bottom edge of the
valve stem oil seal and the valve guide.

Fig. 153: Identifying Valve Components
Courtesy of GENERAL MOTORS CORP.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

6. Install the valve spring (3).

7. Install the valve spring cap (2) onto the valve spring (3), over the valve stem.

CAUTION: Compressed valve springs have high tension against the

valve spring compressor. Valve springs that are not
properly compressed by or released from the valve spring
compressor can be ejected from the valve spring
compressor with intense force. Use care when
compressing or releasing the valve spring with the valve
spring compressor and when removing or installing the
valve stem keys. Failing to use care may cause personal
injury.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado