1981 Evenrude overheat alarm??????

[DiverDown]

on a 1981 200hp evenrude the overheat alarm goes off after running the boat over 3800rpm if I back off the power the alarm will sut off, The Engine temp is running between 140-160 water flow is good out the pee hole. I have changed the thermostats and by pass don't know were to go next? I hope someone will have sone insight to my problem.<br /><br />Thanks

 

[clanton]

Re: 1981 Evenrude overheat alarm??????

How are you checking the engine temp? High speed overheating can be caused by seal between inpeller cup and waterpump housing,and water deflectors under the cylinder heads.

 

[DiverDown]

Re: 1981 Evenrude overheat alarm??????

Hi Clanton, Checking temp by temp gauge.<br />Thanks

 

[clanton]

Re: 1981 Evenrude overheat alarm??????

I would verify that engine is overheating with a melt stick or some other kind of temp checker. Engine over heating, check waterpump and water deflecters behind the cylinder head. you can check the sensor by dipping in hot water, sensor should close at about 200 degrees F

 

[wilde1j]

Re: 1981 Evenrude overheat alarm??????

Are you sure it's not low oil lvl or flow alarm, instead of hot horn? All use the same horn, just different sound.

 

[clanton]

Re: 1981 Evenrude overheat alarm??????

This engine , when new did not have a VRO pump.

 

[Daniel Beckman]

Re: 1981 Evenrude overheat alarm??????

I think it maybe could be the "not enough fuel alarm"<br />R u sure the engin get enough fuel?<br />Di have the same prob on my john faststrike 175 -93.<br />I checked all my hose and the fuel filter inside the engin and cdid clean it up, after that no more alarm <br />Im not sure its the same prob on your engin, but check the filter and all the hose..<br /><br />Good luck<br />Daniel

 

[clanton]

Re: 1981 Evenrude overheat alarm??????

Does not have fuel restriction alarm.