2008 6.6L Duramax – VALVE ROCKER ARM COVER CLEANING AND INSPECTION – UPPER

1. Remove the PC V cover screws.
2. Remove the PC V cover, diaphragm, and spring.

3. Clean the upper valve rocker arm cover. Remove any sludge or other deposits.
4. Clean the upper valve rocker arm cover mating surface.
5. Inspect the upper valve rocker arm cover for cracks or other damage.
6. Inspect the upper valve rocker arm cover mating surfaces for damage.
7. Replace the upper valve rocker arm cover if any damage is found.

8. Inspect the PC V cover, diaphragm, and spring for damage.
9. Install the PC V spring.
10. Install the PC V diaphragm.
11. Install the PC V cover.
NOTE: Refer to Fastener Notice

12. Install the PC V cover screws.
Tighten: Tighten the PC V cover screws to 4 N.m (35 lb in).