Engine Merc 888 (Ford 302) getting hot after warming up

ursa minor · 09-06-2016, 10:57 AM

Is it the original thermostat? (I read your other thread so I know you've done quite a bit of work on the boat / engine.) If original, it sure sounds like a sticking thermostat. I had a similar issue on our 5.7 Mercruiser earlier this summer, replacing the thermostat took care of the overheat. Pretty straight forward job that could be done in the water on my boat.

If the thermostat and raw water pump impeller (the one in the outdrive) have been replaced, it's possible that you have some corrosion blocking flow in the exhaust risers and manifolds. This typically means replacement of those parts.

09-06-2016, 10:57 AM	#2
ursa minor Senior Member Join Date: Aug 2010 Location: Tuftonborough & Franklin MA Posts: 265 Thanks: 97 Thanked 143 Times in 64 Posts	Is it the original thermostat? (I read your other thread so I know you've done quite a bit of work on the boat / engine.) If original, it sure sounds like a sticking thermostat. I had a similar issue on our 5.7 Mercruiser earlier this summer, replacing the thermostat took care of the overheat. Pretty straight forward job that could be done in the water on my boat. If the thermostat and raw water pump impeller (the one in the outdrive) have been replaced, it's possible that you have some corrosion blocking flow in the exhaust risers and manifolds. This typically means replacement of those parts. __________________ " Any day with a boat ride in it is a good day"