Allis Chalmers — Rocker Arms and Shaft Removal

A Allis Chalmers service procedure — check it applies to your exact model before use.

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Procedure

1. Disconnect breather hose from cylinder head cover.
2. Remove cylinder head cover capscrews, washers, and the cylinder head cover.
3. Disconnect oil feed tube compression nut from fitting in cylinder head.
4. Remove the 3/8" capscrews and lockwashers securing the rocker arm brackets to the cylinder head.
5. Remove the 9/16" capscrews and hardened washers securing the rocker arm brackets.
6. Remove the rocker arms, shaft, and brackets as an assembly.
7. Withdraw the push rods from the engine.
8. Disconnect compression nuts; remove oil drain tube and oil feed tube from the end rocker arm brackets.
9. Remove cotter pin, spacer washers and spring washer from one end of the rocker arm shaft.
10. Slide rocker arms, springs, and brackets from the rocker arm shaft.

Source: manual:allis-chalmers-2900-engine-service-manual.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.