We left the dock and the port engine temperature was soon a few degrees higher than normal. I shut it down, nothing obvious in the engine room. Restarted and temp started to rise again. Shutdown and went back to the dock. At the dock I crawled out side the port engine. This is what I saw. When I opened the cover the impeller was melted. I pulled it out and was going to install a spare. However, I noticed some ridges inside the pump housing. I’m wondering if I might need to replace the pump itself too. See picture of ridges.
Was the the sea-cock closed? The big-bad-Detroit-Jabsco with synthetic drive insert. Going to take a wear plate, cam insert and back cover with mechanical seal kit. Do not try to polish that out. Or a new pump and slowly rebuild for a spare with above parts mentioned. Also check your exhaust rubbers. It's a B O A T .
Sea-cock was open. I’ll check water flow before fixing pump. You read my mind. I was going to try to polish it out. Not the plan anymore though I am curious why it wouldn’t work. The rebuild kit is about $1000 vs $3500 for a new pump. The kit includes bearings too. Seems either way the next step is removing the existing pump. How complex is rebuilding?
I have been here before. After removing the cam insert (tube shape), making a jig in a vice, forming tools, filing and hand polishing. After many hours, it sure was pretty. However; Seems I had changed the shape a few thousands of an inch (somewhere) and the next impeller failed quickly. I don't think I chamfered the ports enough also. Cam insert has to be removed anyway to service the wear plate & mechanical seal. Save the hours and replace with factory parts. It is why a whole cam insert was made this way. All wear surfaces are replaced. I learned to luv this cam tube design later after my self schooling. The next smaller pump is the 5 screw covered pump my Detroits have. Just the cam is serviceable in it. The pump body takes permanent wear. I have a collection of these pumps under my work bench. Complex?? No. Mechanical skills,, Yes.. H bar gear/pulley puller and a big work vice,, Yes..
Don’t have a big vise. I think I’ll be getting a new pump. Ran into a problem removing the old pump. One of the bolts holding the pump to the engine flange is rounded off. It’s the hardest to reach right up against the engine. I can barely get a wrench on it. I removed the bolts holding the housing and the retaining clip on the shaft inside the pump. My idea was to remove the housing to get better access to the bolt. Not sure how to get the housing off. Maybe I need to remove the cam. The parts diagram shows a pin, which I have not yet spotted. Now I’m thinking of cutting the bolt head off. Then use a vise grip to get the bolt out.
