582 high engine temp

Re: 582 high engine temp

by Ian Jones » 13 years ago

Ian Jones

2 53 0

G'day Michael,
I live in Western Australia where the temps get somewhat hot during Summer. My temp gauge is in degrees Celsius, and the Rotax engine manual specifies maximum temp of 80 degrees C. This converts to approx 180 degrees Farenheit. My gauge is similarly set up as yours with the intermediate marks not being equidistant. I just monitor the gauge very closely and manage the engine revs when temp readings go past the last mark before 80* . Since the radiator modification I have only seen the gauge get above 70* once, and never to 80*.

Check out the attached photos for my set up.

The last photo is off topic but adds interest ;)

The nose art is based on a photo of my wife taken when she was about 20, som 30 odd years ago.

Hope you solve your problem soon Michael.

Pud

P1030652.JPG (You do not have access to download this file.)

Oldradiatorsetup.JPG (You do not have access to download this file.)

Newradiatorsetup.JPG (You do not have access to download this file.)

Gaygirl.JPG (You do not have access to download this file.)

Re: 582 high engine temp

by bill martin » 13 years ago

bill martin

10 757 0

Mike,

Didn't realize you had a grey head mod. 90. Since the grey head didn't have a coolant bypass system you can certainly take the thermostat completely out with no problems other than a longer warmup. It wouldn't hurt to try it temporarily. I wouldn't recommend it on a permanent basis. You can get into a new set of problems if the engine runs too cold.

Bill.

Re: 582 high engine temp

by Brian Van » 13 years ago

Brian Van

1 3 0

I read above where checking the thermostat is discussed, which is a great idea.

But I didn't see mention of calibrating the gauge. I don't have a procedure but one must exist?
I think it is bad idea to assume the gauge/sensor is accurate.

Re: 582 high engine temp

by Ian Jones » 13 years ago

Ian Jones

2 53 0

That's why, in my case Brian, I checked the temp sender - the one that screws into the head. I unscrewed it from the head and placed it in a pot of very hot water, then monitored the water temp guage on the instrument panel against a separate temp gauge I had. Both read within a few degrees of on another as far as I could tell.

I also did a similar thing with the thermostat where I placed it in a pot of cold water over the stove and heated it up. I monitored the thermostat opening and took a temp reading from my thermometer which was placed in the water. I forget now - have it written down somewhere, at what temp the thermostat starts openiing at, but it was right on the money. So I eliminated 2 possibilities within a short space of time at no cost.

Pud

Re: 582 high engine temp

by Michael Regan » 13 years ago

Michael Regan

5 96 0

Thanks all for all your input on this...all good points.

Done some more work on it tonight. Man am I a dummy I tell ya. I thought I was removing the thermostat housing but instead I was removing the water pump cover. They both look a bit the same when checking the manual. I am currently stopped halfway while I wait on a water pump gasket delivery, but I can tell you what I found out so far...

1/ There doesn't seem to be a thermostat anywhere that I can find. The other side of the engine has a smaller water connection to the block that looks like no thermostat could possibly be inside. Where is it normally situated???

2/ I completely drained out all the old coolant into a measured container and all that was there is 3.2 liters(about 7 pints I think). Thats weird because there is supposed to be about 4.2 liters...so 1 liter is unaccounted for because it always showed full under the cap. Maybe some kind of airlock?

3/ When I removed the water pump cover I could then see clearly the impeller inside... it appears to me the impeller turns the wrong way when turning the prop in the right direction. I could be wrong.... what do ya'll think? See below attachment

MyAvidWaterPump.jpg (You do not have access to download this file.)