Volvo Penta 4.3GL-G Running Hot After Impeller Change

[rrussell1600]

I replaced the impeller today on a 2007 Volvo Penta 4.3GL-G due to a slight drip due to ta faulty o-ring. previous to replacing this, my temp gage never moved, I assumed it was bad. Swapped the impeller out and now the temp gage is working. Running the boat on muffs, the temp reached 200 after a while, so i turned the boat off. attached the hose to the water inlet on the motor and turn it on, the temp gage quickly started to go down. any advice?

 

[Scott Danforth]

Did you possibly have the raw water hoses flipped?

Bypassing the raw water pump by putting the hose directly to the thermostat housing means you toaste the impeller

 

[Georgian blues]

Was the exaust flapper expelling water when you ran with muffs and when it was hooked the water inlet hose?

 

[rrussell1600]

Was the exaust flapper expelling water when you ran with muffs and when it was hooked the water inlet hose?

Water was passing through and coming from the exhaust as normal in both instances.

 

[Georgian blues]

It should have been cooling in both instances. But perhaps if the muffler were not hooked up snug it only heated from to much air. Maybe recheck lock key on impeller. a easy look.

 

[QBhoy]

Was it definitely pumping water out the back when it overheated? Some muffs just don’t work on these