SPRING 8Y5678 - Caterpillar

Table 1
Part Number     Design Configuration    
203-8823     Existing Core (Ductile Iron)    
259-6121     Existing Core (Forging)    
243-2463     New Core (Forging)    
271-3962     New Core (Forging)    The new 243-2463 Valve Rocker Arm and the new 271-3962 Valve Rocker Arm are identical to the existing 203-8823 Valve Rocker Arm and the 259-6121 Valve Rocker Arm in form, fit, and function. Also, the forged rocker arm provides a rugged design alternative to the cast rocker arm. The fasteners, pin, and the roller are identical.The new rocker arms core can be used with the current rocket arm core. The change is adaptable to the serial numbers that are listed above.Refer to Illustration 1 and Table 2 for the variations of the rocker arms that can be received after the 10R-1365 Rocker Arm As is ordered.
Illustration 1 g02711910
Table 2
Callout     Part Number     Description     Design
Configuration    
1     170-8660
203-8823     Rocker Arm     Cast arm with bushing    
2     170-8660
203-8823     Rocker Arm     Cast arm without bushing    
3     243-2463
259-6121
271-3962     Rocker Arm     Forged arm without bushing
brake pad machined    
4     259-6121
271-3962     Rocker Arm     Forged arm with bushing
brake pad machined    Four different variations of rocker arms may be received after ordering 10R-1365 Rocker Arm Assembly. All three are acceptable for use in place of the existing rocker arm assemblies.