View Full Version : Closed Cooling 84 351w overheat

08-03-2009, 03:21 PM
I took out my 84 over the weekend and it was running a little hot (185-190 when it never moved off of 175 before) at cruising speed. When i dropped down to slower speeds it cooled down right away. It ran perfect on the trailer in my drive way for 45 mins the night before with no overheating so it only seems to happen when it is under load.

The impeller is brand new, so that is not the issue. Still learning about the closed cooling systems on this boat and am looking for some ideas on where to look next.

Any help would be great.

08-03-2009, 03:56 PM
How old is the impeller? If you don't know, or it's old, replace that and the gasket. Also, check the oil cooler and if it has any debris in it, clear it out.

08-03-2009, 04:13 PM
Thanks Jim, impeller is brand new this season. Thanks for th oil cooler