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Discussion Starter #1
trying to start my grandads old 1991 f250 but i noticed what i believe to be the timing advancement on the right side (looking from the front) of the injection pump does not move when the throttle is moved, in fact the arm that pushes it bends if the throttle is forced, is that something i can force to move with some oil/very light hammering or would that require a pump rebuild?
 

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That's the light load advance piston and assembly. By the way you describe it, sounds like the pump needs some major surgery.
 
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