My overflow box is a little less then half empty. We found that if its any
more then 1/2 full then
it will full the box all the way up, and start to leak out.
After the engine cools, the "extra" fluid in the box returns to the engine.
When the engine is hot it fill the box a little past the 3/4 mark.
One thing I found out is that the overflow box had not has the MOD done to
the top.. so the first time
it became to full, it would blow the tube off the radiator cap (under the
cap actually). Allowing
fluid to spray everywhere, and allowing the heads to go over the 275F temp.
We reduced the amount of
fluid in the box and that took care of the problem.
Matt Carpenter
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com]On Behalf Of Fred
Fillinger
Subject: Re: Europa-List: expansion tank
> It will suck the antifreeze back. About 6 months ago, I had a
overheating
> problem one hot day when flying. It pushed all the fluid it could
into the
> overflow box.... after I shutdown the engine I pulled the top off..
and
> watched the overflow box begin to drain back into the engine. I was
> surprised that this would happen.
>
> Matt Carpenter
The little brass relief valve on the bottom of the "radiator" cap
isn't surprised. Take a look, and while at it, make sure the seating
area is not gunked up, to maintain max allowable pressure to reduce
boiling point.
Can you estimate how much add'l coolant was added to the overflow tank
by the overheating episode? The reason I ask is the overflow bottle I
have is a few oz. shy of what Rotax recommends, but I don't know if
that's just based on worst possible case. What they want, ratio of
bottle to engine contents, seems out of whack with what they do on
cars.
Reg,
Fred F.
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