- Caterpillar Products: All
- 3500B Engines
Description of Change: A new injector rocker arm assembly, a new valve rocker arm assembly, and a new rocker shaft assembly are used for all 3500B Engines. The new rocker arms have a new sleeve bearing with oil distribution grooves that will better distribute the engine oil across the load bearing area of the bearing. The improved distribution of the engine oil provides a better film of oil that will decrease the wear of the bearing.
Adaptable To: The new 230-2622 Rocker Arm Assembly (Injector) is a direct replacement for the 196-4793 Rocker Arm Assembly (Injector). The new 230-2621 Rocker Arm Assembly (Valve) is a direct replacement for the 154-6388 Rocker Arm Assembly (Valve). The new 230-2633 Rocker Shaft Assembly is a direct replacement for the 196-4791 Rocker Shaft Assembly. The 230-2622 Rocker Arm Assembly (Injector), the 230-2621 Rocker Arm Assembly (Valve), the 230-2633 Rocker Shaft Assembly, and the 230-2620 Sleeve Bearing are now serviced parts.
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| Illustration 1 | g01021710 |
Old rocker arm assembly | |
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| Illustration 2 | g01021712 |
New rocker arm assembly (1) Oil distribution grooves in the bearing | |