I bought my 2007 Mariner 37 last summer. It had 430 Hours on the Cummins QSB 5.9 engine, but the water pump was failing as noted by Cummins service when PO had engine reprogrammed form 230 to 380 HP. Evidently that is common for these Sherwood pumps.
There was a new spare pump in the inventory (JMP P/N JPR-S7608) and I have installed it. I am considering rebuilding the OEM pump to keep as a spare.
I believe the pump on the engine was OEM Sherwood. The shaft will need to be replaced, as well as seals, bearings, wear plate, cam, etc. Has anyone rebuilt one of these? If you were able to obtain an overhaul kit, where did you get it? Or did you have to buy all of the parts separately?