Overheating Maybe

[Private Nemo]

Hi , I have twin Mercruiser 1986, 260 motors. One motor runs at 145 degrees , never climbs above that. The other motor at idle climbs up to about 185 degrees. But if I increase rpm's , the temp comes down to about 150 degrees. I am not in the water yet, I am running these guys on muffs. New impeller and new thermostat. Do I have a problem or the beginning of a problem.

thanks

Drew

 

[Bt Doctur]

Re: Overheating Maybe

slight clog in the risers, new impeller or new water pump kit?

 

[achris]

Re: Overheating Maybe

What condition is the engine circ pump in?

 

[Private Nemo]

Re: Overheating Maybe

New last season

 

[achris]

Re: Overheating Maybe

Getting hot at idle and cooling when the revs increase is usually a sign of a bad impeller, but since you said they are new..... did you do the replacement? Maybe (just offering it out there, please don't be offended) something still isn't right with the impeller...

Chris.........

 

[Private Nemo]

Re: Overheating Maybe

yes i di it. Dont think I made a mistake , but anything is possible

 

[Private Nemo]

Re: Overheating Maybe

So is that the consensus , its the impeller , even though its new. ?

 

[achris]

Re: Overheating Maybe

Maybe not the impeller itself, but something in that area.

Have you watched my water pump video? Plenty of tips and tricks in there...

Chris........

 

[Private Nemo]

Re: Overheating Maybe

" Stupid Human Tricks ". With that said I fix it; for those who are interested. When I replace the impeller there is a tube that goes from the lower unit to the upper unit of the outdrive. This supply's water to the engine. At the top of this tube there is a rubber bushing . I crushed it , so it was partially blocking coolant flow.

a big duh

thanks for the replies, appreciate it

 

[achris]

Re: Overheating Maybe

Glad it's fixed...