1995 Mercruiser overheating

[petemac]

My partner had the impeller replaced which disintegrated and overheated end of last season, then a valve went bad so we replaced the heads, the engine still overheats going straight up to 200 degrees plus. Could it be a thermostat issue or should I check for blockage in the impeller lines? The engine has been a solid performer up until now. Any suggestion would be helpful thanks!!

[kiley]

Did you check for any of the things listed in your previous post regarding this?

http://www.themalibucrew.com/forums/index....showtopic=14030

If not there is a list of things to check...

My partner had the impeller replaced which disintegrated and overheated end of last season, then a valve went bad so we replaced the heads, the engine still overheats going straight up to 200 degrees plus. Could it be a thermostat issue or should I check for blockage in the impeller lines? The engine has been a solid performer up until now. Any suggestion would be helpful thanks!!

[99response]

Make sure those hoses are on the right way, you may be reverse pumping.

Also replace the thermostat.

-Chris

[Maliburesponse03]

My partner had the impeller replaced which disintegrated and overheated end of last season, then a valve went bad so we replaced the heads, the engine still overheats going straight up to 200 degrees plus. Could it be a thermostat issue or should I check for blockage in the impeller lines? The engine has been a solid performer up until now. Any suggestion would be helpful thanks!!

You might need to check the impeller again and the lines because last tear we had that happen or you might have a valve shut off under the motor.

[VinRLX]

Could it be a thermostat issue or should I check for blockage in the impeller lines?

In a word? YES.

Replace thermostat.

Check for clogged impeller lines.

Check poppet valves in thermostat housing.

And call us in the morning.

[apexeon]

Check the transmission cooler. It is just aft of the raw water pump. Disconnect the hose to the cooler. There is a screen on the inside of the cooler that can get clogged and restrict water flow. If it's really clogged it can create so much back pressure that it will damage the impeller on the raw water pump.

[petemac]

THANKS TO ALL!!! Really appreciate the helpful comments If these dont work i'm thowing out the Bu and buying a disposable Bayliner!!