Valve Rocker Arm Cover Cleaning and Inspection - Upper for GMC Truck TopKick C-Series (Conventional) C4/C5 2007

1. Remove the PCV cover screws.
2. Remove the PCV 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 PCV cover, diaphragm, and spring for damage.
9. Install the PCV spring.
10. Install the PCV diaphragm.
11. Install the PCV cover.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

12. Install the PCV cover screws.

Tighten
Tighten the PCV cover screws to 4 N·m (35 lb in).