Hello Everyone,
Need a little help with my overheating issue. Here's the history:
Began overheating while on the lake. Took it home and put muffs on and water was barely trickling out of the exhaust. So, I changed the risers, installed new ss gaskets, changed the impeller even though the old one was still soft and flexible, I changed the exhaust bellows and then installed new duckbill exhaust hoses that come out the bottom each side of the 280 outdrive. I did lightly sand the Johnson raw water pump faceplate to get the scale off of it with emery cloth. Not sure if that would cause a problem, I installed a new gasket when I changed the impeller. After all that I started it up and it's overheating again. When I crank it up and let it idle the temp will start rising continuously after it warms up. If I go up to 2500 to 3000 rpms the temp will slowly go down to about 160 then begin rising again. If I let it idle after going to high rpms the temp will climb pretty quickly as well. So I pulled the thermostat housing, removed the thermostat, installed a new gasket and cranked it back up, it began overheating again. It doesn't seem to be getting enough water, somehow. Any ideas as to what else I could possibly change or do to get this to stop overheating? I installed a new water pump about a year ago, it's not dripping or anything so I don't believe that's the issue. Thanks for reading this and giving any suggestions you may have. Hopefully Don S. will chime in, he's really good on these Volvo Pentas.
Need a little help with my overheating issue. Here's the history:
Began overheating while on the lake. Took it home and put muffs on and water was barely trickling out of the exhaust. So, I changed the risers, installed new ss gaskets, changed the impeller even though the old one was still soft and flexible, I changed the exhaust bellows and then installed new duckbill exhaust hoses that come out the bottom each side of the 280 outdrive. I did lightly sand the Johnson raw water pump faceplate to get the scale off of it with emery cloth. Not sure if that would cause a problem, I installed a new gasket when I changed the impeller. After all that I started it up and it's overheating again. When I crank it up and let it idle the temp will start rising continuously after it warms up. If I go up to 2500 to 3000 rpms the temp will slowly go down to about 160 then begin rising again. If I let it idle after going to high rpms the temp will climb pretty quickly as well. So I pulled the thermostat housing, removed the thermostat, installed a new gasket and cranked it back up, it began overheating again. It doesn't seem to be getting enough water, somehow. Any ideas as to what else I could possibly change or do to get this to stop overheating? I installed a new water pump about a year ago, it's not dripping or anything so I don't believe that's the issue. Thanks for reading this and giving any suggestions you may have. Hopefully Don S. will chime in, he's really good on these Volvo Pentas.