overheating issue

[wtg2320]

I have an 88 mercruiser 2.5L alpha one. I had it on the water yesterday and it was running really hot, 190+. When i had it mid throttle the temp would drop to 150-160 almost immediatley. Higher throttle and idle would make it overheat. I know it could be anything from waterpump to the thermostat. Question is, the way that it is acting is there a way to narrow it down without replacing everything?

 

[stonyloam]

Chances are you need a new impeller in the outdrive, start there. How long has it been since the impeller has been changed?

 

[Starcraft5834]

Chances are you need a new impeller in the outdrive, start there. How long has it been since the impeller has been changed?

+1 what he said...........that will probably fix it for u...

 

[wtg2320]

thanks guys hope that is the problem....seems easy enough to replace

 

[Bondo]

I have an 88 mercruiser 2.5L alpha one. I had it on the water yesterday and it was running really hot, 190+. When i had it mid throttle the temp would drop to 150-160 almost immediatley. Higher throttle and idle would make it overheat. I know it could be anything from waterpump to the thermostat. Question is, the way that it is acting is there a way to narrow it down without replacing everything?

Ayuh,..... Replace the Impeller, it's always the very 1st place to start, in any over-heat situation,...

 

[wtg2320]

Thanks guys!! Impeller was replaced. Now it's running about 130-140 range.

 

[redneck joe]

A broken fin or two? Did you find them?



rj