Still overheating

[ratkinson]

Please help! My 25hp 1970 johnson is reading as high as 200'F on the powerhead after running WOT. I checked the stat and impeller and they look fine. I pulled the plugs, no water. What could be the problem. Water is coming out of the water outlet...splutter and I blew air through the water cooling lines and got a good result. If anyone has any ideas please let me know. When I bought the engine the old stat was warped and in poor shape so I don't know if there is any internal damage. The engine runs well so I hope not.

 

[fireman57]

Re: Still overheating

Check where the tstat sits in the head and make sure that part of the old gaskets is still not in the hole blocking it. The only other recourse is to pull your lower unit again and clamp a hose on your water tube and turn it on full force and see what kind of pressure you have out your peehole. You might take the tstat out and watch what kind of flow you have out of there.

 

[Walker]

Re: Still overheating

There are a lot of waterpumps that "look" good but do not do an adequate job of pumping water. When was the last time your's was replaced??