cracked exhaust

Nice job on that Tim .
Except A&B are backwards and your arrows for J&I are running the wrong way. Warm engine water goes through H&G out of the manifolds through J&I back under the thermo to have hot water go out D&E to cool the top of the exhaust a little more, then out or ,reciculated back through F into the block .

Tim D To answer your ? I dont know . This is the way I bought it .

The only thing that was probably wrong with the pump was probably the seal . I was running out of time , so I bought a new pump .

Pat, my next project may have this same motor so I thought I would bring this thread back up. I believe you fixed your cooling problem with a new RWP, correct? I think you said the old one was sucking air.

I took a look at the cooling diagram from another post:



In trying to understand it, I attempted to simplify the diagram. Hopefully this is correct:

If I were a betting many I'd bet it on what JasonR added above. Coincidentally we've seen the same problem on several boats in the last year. Any line/hose downstream of the impeller is suspect. The impeller bits will flow up an lodge in the next smaller housing or neck. We've got the same Conquerer engine package in a 351 and the exhausts stay really hot but we haven't gotten around to diagnosing it yet, but that's what I'm looking for. Also, and what might not be your issue, I've had what looked like a good impeller from a visual inspection of the impeller still in the pump, but when I finally pulled it out after initiallly dismissing it as the culprit, I found the vanes torn to pieces on the bottom side of the impeller. I just couldn't see it.

Pat, hopefully you rec'd the shaft coupling from me. If not it should be there any day, and I apologize for it taking so long.    

Yes an exhaust water leak can cause you to overheat, care to tell us what you have already changed and ruled out in diagnosing the problem?

Guys we need to put our heads together and get Pat some help, he's been fighting this overheating problem for a while. I'm not familiar with his cooling system so I'm little help.

He said if it's not fixed by Green lake he's gonna show up in a Bayliner. This is mission critical now!!!