Overtemp only when on plane

tummyman · 08-25-2018, 08:25 AM

Check to see if any of the water intake holes are plugged.....

Cal Coon · 08-25-2018, 09:06 PM

Quote:

Originally Posted by tummyman

Check to see if any of the water intake holes are plugged.....

If water intake holes are good to go, I would check / replace thermostat. Also, if you can, put it on a trailer, and run it on engine ears in the driveway and check the amount of water that is being pumped out. Try this at different rpm's to see if it makes any difference in water flow. I trailer my boat, and start my boat all the time in the driveway, so I have a pretty good idea of how much water gets pumped out as the boat is running, so I would notice if it was less than usual. If you keep your boat in the water, you may not be as familiar, but I would be curious to see if the boat acts the same way on engine ears, as it does under a load.

lfm · 08-25-2018, 09:54 PM

Boats in the water, gonna pull it tomorrow.

Doesn’t seem to be tied to RPM, can run at high rpm with the bow up, and it will overheat at the same rpm if I get the boat on plane. Seems to me that it must be able to get good water flow, and wouldn’t that indicate thermostat is okay?

Maybe sucking air somehow when on plane?

08-25-2018, 08:25 AM	#1
tummyman Senior Member Join Date: Aug 2009 Location: Moultonborough Posts: 844 Thanks: 260 Thanked 688 Times in 245 Posts	Check to see if any of the water intake holes are plugged.....

The Following User Says Thank You to Cal Coon For This Useful Post:
lfm (08-25-2018)

08-25-2018, 09:54 PM	#3
lfm Senior Member Join Date: Sep 2003 Location: Alton Bay Posts: 96 Thanks: 29 Thanked 6 Times in 4 Posts	Boats in the water, gonna pull it tomorrow. Doesn’t seem to be tied to RPM, can run at high rpm with the bow up, and it will overheat at the same rpm if I get the boat on plane. Seems to me that it must be able to get good water flow, and wouldn’t that indicate thermostat is okay? Maybe sucking air somehow when on plane?