Chevrolet Silverado / GMC Sierra. Manual — part 166
Fig. 553: Exhaust Valve Oil Stem Seal
Courtesy of GENERAL MOTORS CORP.
1. Assemble the valve into the proper valve guide.
IMPORTANT: The exhaust valve oil stem seal has the letters EX (1) molded
into the top of the seal. The exhaust valve oil stem seal
material is brown in color (2) with a white stripe (3) painted
onto the outside diameter of the seal, or the material may be
red in color (2) with no paint stripe. The intake valve oil seal
is black in color.
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
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. 554: 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.
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.
CAUTION: Refer to SAFETY GLASSES CAUTION .
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
Fig. 555: Identifying Valve Components
Courtesy of GENERAL MOTORS CORP.
6. Install the valve spring (3).
7. Install the valve spring cap (2) onto the valve spring (3), over the valve stem.
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
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