MOTOR GP-PISTON 4989582 - Caterpillar

Disassembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 1P-1855 Retaining Ring Pliers 1 Start By:
Remove the rocker shaft assembly. Refer to Disassembly and Assembly, "Rocker Shaft and Pushrod - Remove".
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Personal injury can result from being struck by parts propelled by a released spring force.Make sure to wear all necessary protective equipment.Follow the recommended procedure and use all recommended tooling to release the spring force.
Make an identification mark on each rocker arm assembly in order to show the location. Note: The components must be reinstalled in the original location. Do not interchange components.
Illustration 1 g01350909
Typical example
Use Tooling (A) to remove circlip (1) and remove washer (2) from both ends of the rocker shaft assembly. Note: Rocker shaft (7) is not symmetrical as there is a machined flat (6) toward one end of the shaft.
Remove rocker arm assembly (3) for the inlet valve from rocker shaft (7). Remove rocker arm assembly (4) for the exhaust valve from rocker shaft (7).
Remove spring (5) from rocker shaft (7).
Repeat Step3 and Step4 in order to completely disassemble the rocker shaft assembly.
If necessary, remove nuts (8) and adjusters (9) from the rocker arms. Make a temporary identification mark on each adjuster in order to show the location. Note: The components must be reinstalled in the original location. Do not interchange components.