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1106 Perkins - Rocker Shaft and Pushrod (Remove and Install)

Rocker Shaft



Remove:
- the rocker shaft assembly. Make an identification mark on each rocker arm assembly in order to show the location. The components must be reinstalled in the original location. Do not interchange components.
- the pedestals (1) from the rocker shaft (5). It is not necessary to remove the locators (2) from the pedestals.
- the rocker arm assembly (4) for the exhaust valve from rocker shaft (5).
- rocker arm assembly (3) for the inlet valve from rocker shaft (5). Begin at the rear of the rocker shaft assembly. The rocker arm assembly for the inlet valve is longer than the rocker arm assembly for the exhaust valve.
- the spring (6) from the rocker shaft (5). Repeat Steps to remove the remaining rocker arms from the rocker shaft.
- If necessary, remove retaining clip (7) and remove spring (8) from the front end of the rocker shaft (5).
- If necessary, remove the nuts (10) and the adjusters (9) from the rocker arms. Make a temporary identification mark on each adjuster in order to show the location.



Ensure that all components are clean and free from wear or damage. If necessary, replace any components that are worn or damaged. If necessary, install the nuts (10) and the adjusters (9) to the rocker arm assemblies (3) and (4). If the original adjusters are reused, ensure that the adjusters are installed in the original positions.

Install:
- the retaining clip (7) and the spring (8) to the front end of the rocker shaft (5). Lubricate the bores of the rocker arm assemblies (3) and (4) and the rocker shaft (5) with clean engine oil.
- the rocker arm assembly (3) for number 1 inlet valve to the rocker shaft.
- the rocker arm assembly (4) for number 1 exhaust valve to the rocker shaft (5). The rocker arm assembly for the inlet valve is longer than the rocker arm assembly for the exhaust valve. Used components should be installed in the original location. If necessary, ensure that the locator (2) is correctly seated in the pedestal (1). Ensure that the counterbores for the holes in the rocker shaft (5) are upward. Align the locator (2) with the hole to the front of the rocker shaft (5).
- the pedestal to the rocker shaft.
- the spring (6) to the rocker shaft (5). Repeat Steps to assemble the remaining components to the rocker shaft (5).
- the rocker shaft assembly.

Rocker Shaft and Pushrod

Clean the valve bridges. Inspect the valve bridges for wear or damage. Replace any valve bridges that are worn or damaged.



Lubricate the valve bridges (4) with clean engine oil. Install the valve bridges to the cylinder head. Install used valve bridges in the original location and in the original orientation. Ensure that the valve bridges are correctly seated on the valves. New valve bridges may be installed in either orientation. Clean the pushrods. Inspect the pushrods for wear or damage. Replace any pushrods that are worn or damaged.

Apply clean engine lubricating oil to both ends of the pushrods (3). Install the pushrods to the engine with the cup upward. Ensure that the pushrods (3) are installed in the original location and that the ball end of each pushrod is correctly seated in the valve lifters. Ensure that the rocker shaft assembly is clean and free from wear or damage. Install the 12 torx screws (1) in the rocker shaft.

Position the rocker shaft assembly (2) onto the cylinder head. The retaining clip (6) should face the front of the engine. Ensure that the adjustment screws (5) are properly seated in the ends of pushrods (3). Gradually tighten the torx screws (1). To avoid distortion of the rocker shaft assembly (2), tighten the torx screws in the center first. Work toward the outside of the rocker shaft assembly. Tighten the torx screws (1) to a torque of 35 Nm (26 lb ft).

Use Tooling in order to check the valve lash. If necessary, adjust the valve lash. Install the valve mechanism cover.

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