Aviation Forums

JPS · Guest

I've a Rotax 582 Mod99 (Blue headed) engine with about 20 hours. I'm
experiencing overheating problems: At 5500 rpm the water temperature goes up
to 80ºC(176F) with the outside temperature (air) about
28ºC(82.4F)-30ºC(86F).
With cooler air temperatures, such as 18ºC(64.4F)-20ºC(68F), at 5500rpm, the
water temperature usually stabilizes at about 75ºC(167F), which I think is
already high.
I've checked: cooling liquid; radiator (cleaned external and internally);
correct fuel/oil mixture.

Previously, I owned a Rotax 582 Mod90 (Grey headed), which used the same
cooling circuit, i.e, same radiator, same water temperature sensor and gauge
and same overall system disposition on the aircraft. With this engine, I
didn't experienced any kind of overheating problems, no matter how high the
external temperature was.

What can it be?

Thanks in advance!

Best regards,
JPS

Mark Ambrose · Guest

Sounds like you have a trapped air bubble in your coolant system. Either that or
your impeller isn't pumping water. Check for an air bubble first. Lift the tail
of the aircraft with the coolant system open.You may have to do this several
times. If all else fails get yourself a device called an "Air Lift". It uses a
compressor to pull a vacuum in the coolant system, then sucks the coolant to
fill the vacuum without trapping any air. I've used the tool with very good
results.

Mark Ambrose

JPS wrote:

Fr. John Elledge · Guest

Is there an echo in here?

"JPS" <jpspitfire (AT) netcabo (DOT) pt> wrote

Q · Guest

Any chance you have a mix of more antifreeze than water? A friend of mine
had a similar problem and changed to a 60% water/40% antifreeze. Problem
solved.

Q

"JPS" <jpspitfire (AT) netcabo (DOT) pt> wrote

Gordon L. Slivinski · Guest

Hi JPS .

May i sujest that try going to this web site
http://www.worldtalkradio.com/channel.asp?cid=2 . I t is the the site of
Ultra Flight Radio . Tom Oleniuk has weekly talks on engine maitience
and care for the last 4 or 5 weeks. It is always the 4th articail . He
is a Rotax engine mechanic and knows everything about the 582 . The 582
BTW should run between150 F. and 175 F. with the proper coolant (
Orange) in it .
Check it out .

Gordon

JPS wrote:

Mark Smith · Guest

VideoFlyer wrote:

FIyer111 · Guest

<

The NAPA number used to be 18-3670. But I think it may have been discontinued.

OMC has a thermostat that cross references with the 18-3670 kit. It is a 160
degree thermostat...OMC part #982554. That is just the thermostat. They also
sell a kit that includes gaskets and stuff but I don't think they would fit.
The thermostat itself works fine. West Marine or any OMC dealer should
probably have one in stock....under 10 bucks.

smw · Guest

is there air in the cooling sys? have you pressurized the cooling sys to see
if there are any leaks? the radiator cap could be leaking. the thermostat
could be defective or be the wrong temperature rating. what is the temp that
the thermostat opens? it should be stamped on it. put it in a pot of hot
water on your stove with a thermometer and see if it opens at the temp it
should. just a few ideas hope this helps.
"JPS" <jpspitfire (AT) netcabo (DOT) pt> wrote

Sten-Anders Fellman · Guest

Probably an air bubble in the system. I usually have the opposite problem,
have to cover the radiator about 30 % in the summer and more then 50 % in
the winter to get the temperature to up to 60 degrees.

Sten-Anders Fellman
www.saf.net

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