454 overheating

[Stu]

Yes it did. And how does that affect the pumping ability?

 

[Hampton]

Yes it did. And how does that affect the pumping ability?

It needs to flex out against the sides of the housing to produce a good seal that doesn't leak back and/or allow bypass so that all of the water it grabs goes forward.

 

[rondds]

Wayne, when my port engine was running hot many moons ago, I had the marina change the impeller. When I went to the boat the following weekend, I noticed some things in the salon moved around and there was an impeller in the original plastic blister pack on the galley counter. It looked so good, I wondered what the hell they did - maybe they just took a look at the job and decided to come back another day. When I took the impeller out of the plastic package and took a closer look, it had an ever-so-slight "set." Barely perceptible. But it made a difference and the boat ran cooler after that.

 

[Stu]

Thanks guys, it is amazing what such a small difference can make. Want to thank everyone for their help and it was another learning experience

 

[techmitch]

Sounds like a bad impeller to
me, raw water or fresh water side. It should increase slightly when coming off plane. After a minute or two it should return to normal. If not, usually a bad impeller.

While on plane water is moving thru the thru hull at a much higher rate. Once off plane you are counting more on the impeller to move water.

glad you got it fixed stu, but this was the second post to your question!!! happy and safe boating...