Put the engine at 24 degrees before TDC (on #1) prior to pulling the pump. If the injection pump is Bosch production code number "251" (November 1982) the mark for begin of delivery may be applied to the wrong spot on the bearing cap. Look to see if the spline is properly lined up when you remove you IP. If the mark on the IP bearing cap is approximately lined up with the center of the screw then the mark is in the correct place.

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Jim