89 mercruiser 3.7 milky oil out of dipstick

[NHGuy]

Check for failures around the impeller housing, which is inside the lower. Intermittent pumping sounds as if there's a hold down screw missing or a blockage. Or perhaps there is a piece that's out of shape. Could be the pump body, the tube up from the pump, or the water pocket fixture the tube fits into in the upper.
Could be other things but I'd look around in there unless someone has a better idea.

 

[atwall2011]

Any idea where I could find a manual and or schematics?