Located beneath the injection pump delivery valve holder is:

Compression spring

Copper seal

Delivery valve

Delivery valve carrier


Beneath this carrier is a piston that has a central vertical bore; near the top is a horizontal bore that communicates with the central bore. Further down the piston is another horizontal bore that also communciates with the central bore; this lower horizontal bore is 180 degrees removed from the position of the upper horizontal bore. Finally, below the skirt of the piston is a vertical notch that is approx. 70 degrees to the right of the upper horizontal bore.

Question is: what is the proper installation position of this piston as it is installed into the body of the injection pump?