56. Valve Rocker Arm and Push Rod Installation

Valve Rocker Arm and Push Rod Installation





Note:
* When using the valve train components again, always install the components to the original location and position.
* Valve lash is net build. No valve adjustment is required.

1. Lubricate the valve rocker arms and pushrods with clean engine oil.
2. Lubricate the flange of the valve rocker arm bolts with clean engine oil.
3. Install the valve rocker arm pivot support.





Note: Ensure the pushrods seat properly to the valve lifter sockets.

4. Install the pushrods.





Note:
* Ensure the pushrods seat properly to the ends of the rocker arms.
* DO NOT tighten the rocker arm bolts at this time.

5. On engines with offset intake rocker arms (1), install the rocker arms and bolts - engine RPOs LY6, L94, L96, and L9H.




6. On engines without offset rocker arms, install the rocker arms and bolts - engine RPOs L20, LMG, LC9.




7. Rotate the crankshaft until number 1 piston is at top dead center of compression stroke.
In this position, cylinder number 1 rocker arms will be off lobe lift, and the crankshaft sprocket key will be at the 1:30 position. The camshaft and crankshaft sprocket alignment marks (1, 2) will be in the 12 o'clock position. If viewing from the rear of the engine, the additional crankshaft pilot hole, non-threaded, will be in the 10:30 position.
The engine firing order is 1, 8, 7, 2, 6, 5, 4, 3.
Cylinders 1, 3, 5 and 7 are left bank.
Cylinders 2, 4, 6, and 8 are right bank.

Caution: Refer to Fastener Caution (Fastener Caution)

8. With the engine in the number 1 firing position, tighten the following valve rocker arm bolts:

1. Tighten the exhaust valve rocker arm bolts 1, 2, 7, and 8 to 30 Nm (22 lb ft).
2. Tighten the intake valve rocker arm bolts 1, 3, 4, and 5 to 30 Nm (22 lb ft).

9. Rotate the crankshaft 360 degrees.
10. Tighten the following valve rocker arm bolts:

* Tighten the exhaust valve rocker arm bolts 3, 4, 5, and 6 to 30 Nm (22 lb ft).
* Tighten the intake valve rocker arm bolts 2, 6, 7, and 8 to 30 Nm (22 lb ft).