Tools Required

1. Remove the valve rocker arm cover(s). Refer to Valve Rocker Arm Cover Replacement .
2. Remove the rocker arm and the push rod. Refer to Valve Rocker Arm and Push Rod Replacement .
3. Remove the spark plug. Refer to Spark Plug Replacement in Engine Electrical.



4. Install the J 23590 to the spark plug port and apply compressed air in order to hold the valves closed.



5. Install the J 38606 on the valve spring.



6. Compress the valve spring using the J 38606 .
7. Remove the valve locks.
8. Remove the valve spring and cap.



9. Remove the valve stem oil seal.
10. Inspect the valve spring for bent, cracked or broken parts. Replace the valve spring if faulty. Refer to Cylinder Head Cleaning and Inspection .

Tools Required

1. Place the oil seal over the stem until the seal begins to contact the valve guide.

Notice: Use hand pressure only when installing the valve stem oil seal using the J 41512. Using too much force may cause damage to the oil seal and possibly lead to excessive oil consumption.

Important: The color of the replacement seal may not be the same color as the original seal. Install the seals in their correct location based on GM part and package description. Make sure that the seal is fully seated on the valve guide.

2. Push the valve stem oil seal over the valve guide using the J 42863 until the tool bottoms on the valve spring seat.



3. Install the J 38606 on the valve spring.



4. Compress the valve spring using the J 38606 .
5. Install the valve spring and cap.
6. Install the valve locks.
7. Release the valve spring.




Important: Make sure that the valve locks are seated.

8. Release the air pressure and remove the J 23590 .
9. Install the spark plug. Refer to Spark Plug Replacement in Engine Electrical.
10. Install the push rod and the valve rocker arm. Refer to Valve Rocker Arm and Push Rod Replacement .
11. Install the valve rocker arm cover(s). Refer to Valve Rocker Arm Cover Replacement .