1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 375Get this manual
Quality of the image is intentionally reduced!
4 Inve rt casting on bcn ch and in tall pump plunger in cy lind er with8" (96mm) diame ter wer pump pring in end of lun ge rPlace reta in cap ove par ts an in rt into cylinder Pre cap down with tool )