Tools Required

1. Remove the valve rocker arms.

Refer to Valve Rocker Arm and Push Rod Replacement .




2. Remove the spark plugs. Refer to Spark Plug Replacement in Engine Electrical.



3. Install the J 22794 into the spark plug hole.

Caution: Wear safety glasses in order to avoid eye damage.

4. Apply compressed air in order to hold the valves in place.



5. Install the valve rocker arm nut.
6. Use the J 5892-D in order to compress the valve spring.



7. Use the J 38606 if clearance does not permit use of J 5892-D.



8. Remove the valve stem keys (1).
9. Carefully release the valve spring tension.
10. Remove the J 5892-D or the J 38606 .
11. Remove the valve spring cap (3) and the valve spring (4).
12. Remove the valve stem oil seal (2).

Tools Required

Important: The exhaust valve oil 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 on the outside diameter of the seal.

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 guide with clean engine oil GM P/N 12345610 or equivalent.
4. Assemble the valve stem oil seal onto the valve stem.

Install the valve stem oil seal onto the valve guide using the J 42073 .

Install the valve stem oil seal onto the valve guide until the J 42073 bottoms against the valve spring seat.




5. Inspect the valve stem oil seal. The valve stem oil seal should not be bottomed against the valve guide. Ensure there is a 12 mm (0.03937-0.07874 in) gap between the bottom edge of the valve stem oil seal and the valve guide.



6. Install the valve spring (4).



7. Use the J 5892-D in order to compress the valve spring.



8. Use the J 38606 if clearance does not permit use of J 5892-D.
9. Install the valve stem keys.

Use grease in order to hold the valve stem keys in place.

10. Carefully release the valve spring pressure. Ensure that the valve stem keys stay in place.



11. Remove the J 5892-D or J 38606 and the J 22794 .



12. Install the spark plugs. Refer to Spark Plug Replacement in Engine Electrical.



13. Install the valve rocker arms. Refer to Valve Rocker Arm and Push Rod Replacement .