Hi, anyone know how to time the pump on a om636 . Its in a 53' 170ds. This car was taken apart, and the pump was removed. It has a mark near the coupling. Does it line up with a screw or something? No other marks on pump.

The engine was stuck, and my guess is somebody removed all the injection stuff to try and work on it. I put a long pipe/ ratchet combo above a jack stand on the crank nut. With some ATF & Acetone in the injector holes. It popped apart. Seems to have good compression.