SWITCH AS-ROCKER 4989091 - Caterpillar

Installation Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 227-4389 E10 Torx Socket 1
B 934-913 Rocker Assembly Tool 4
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Clean the pushrods. Inspect the pushrods for wear or damage. Replace any pushrods that are worn or damaged.
Illustration 1 g01359104
Typical example
Apply clean engine lubricating oil to both ends of pushrods (3). Install the pushrods to the engine with the cup upward. Note: Ensure that the pushrods 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.
If the rocker shaft assembly was disassembled, install Tooling (B) between each pair of rocker arms.
Illustration 2 g01323445
Typical example
Ensure that machined flat (X) is facing upward, and facing the front end of the engine.
Position rocker shaft assembly (2) onto the cylinder head. Note: Ensure that adjustment screws are properly seated in the ends of pushrods (3).
Install torx screws (1) to the rocker shaft assembly finger tight.
Illustration 3 g01323447
Typical example
Use Tooling (A) to progressively tighten torx screws (1). Begin at the center of the rocker shaft assembly and work toward the ends. Note: To avoid distortion of the rocker shaft assembly, each torx screw should be tightened by a quarter of a turn at one time. Repeat the procedure until all torx screws are tightened.Tighten torx screws (1) to a torque of 35 N m (26 lb ft).
Check the valve lash. Refer to Systems Operation, Testing and Adjusting, "Engine Valve Lash - Inspect/Adjust". If necessary, adjust the valve lash. Refer to Systems Operation, Testing and Adjusting, "Engine Valve Lash - Inspect/Adjust" for the correct procedure. End By:
Install the valve mechanism cover. Refer to Disassembly and Assembly, "Valve Mechanism Cover - Remove and Install".