Re: Is my 4 cyl 50 hp Merc running too hot???

[steve2manyboats]

Bill:

Thaanks so much for the helpful post. The impeller is reasonably new. I have had a few of these motors over the years. The boat is used in the midbay Chesapeake region so the water is only about half salt. I have never had the water jackets on any of these motors plug up, but I have had the inner water jackets on the exhaust side rot out twice on other motors. In each case water got into the exhaust ports, the motors ran crappy and I could tell exactly what was happening when the spark plugs from those cylinders were steam cleaned so I was able to repair before any damage was done to the rings or bores.

This motor is one of the later ones and has the tell tale hose coming from the block. It’s a very low hour motor. Probably only has 50 hours on it.

I’ll pop in a new impeller and keep an eye on it.

Thanks…Steve2ManyBoats.