75. Valve Rocker Arm and Push Rod Installation

Valve Rocker Arm and Push Rod Installation






1. Install the valve pushrods.

Important:
Be sure to keep parts in order. Parts must be reinstalled into the original location and position.







2. Install the valve rocker arm supports.

Important:
Be sure that the arrow on the valve rocker arm support is in the up position.






3. Apply prelube GM P/N 12345501 (Canadian P/N 992704) or equivalent, to the following valve rocker arm contact surfaces:
^ Valve pushrod socket (1)
^ Roller pivot (2)
^ Valve stem tip (3)





4. Install the valve rocker arm assemblies as follows:
1. Finger start the bolt at location (1)
2. Finger start the bolt at location (2)
3. Finger start the bolt at location (3)
4. Finger start the remaining valve rocker arm bolts






5. Rotate the crankshaft balancer clockwise until the alignment marks on the crankshaft balancer are aligned with the tabs on the engine front cover, 1 with 2 and 3 with 4. At that point the number 1 piston should be at TDC of the compression stroke.

Important:
Rotate the number 1 cylinder to top dead center (TDC) of the compression stroke. The engine front cover has 2 alignment tabs and the crankshaft balancer has 2 alignment marks which are spaced 90 degrees apart that are used for positioning the number 1 piston at TDC.


6. Tighten the valve rocker arm bolts.
^ Tighten valve rocker arm bolts to 30 Nm (22 lb ft).

Notice:
Refer to Fastener Notice in Service Precautions.

Important:
Once the valve rocker arm assemblies are installed and properly torqued, no additional valve lash adjustment is required.