CaliFormula
Cadet
- Joined
- Jan 26, 2019
- Messages
- 22
Hello everyone, I’ve got a problem. My 1985 Mercruiser 5.7 is overheating under load at about 2000 RPM. I have done new risers and manifolds, new impeller already swapped my 160 thermostat for a 142 thermostat. I checked and the flappers and they were fine. I have freshwater cooling and verified that raw water is flowing through. It runs 165-175 at idle and lower rpms. As soon as I rev up and get on plane between 2000-3000 rpms it creeps up 200+.
I also recently rebuilt the heads I thought it might be a valve issue, maybe too tight but I’ve since adjusted them and I believe I have ruled that out. Any ideas on what to check next would be really appreciated.
1985 Formula LS3
Mercruiser 260 Serial# 6765655
Alpha 1 Drive
I also recently rebuilt the heads I thought it might be a valve issue, maybe too tight but I’ve since adjusted them and I believe I have ruled that out. Any ideas on what to check next would be really appreciated.
1985 Formula LS3
Mercruiser 260 Serial# 6765655
Alpha 1 Drive