Slow Glycol Loss - 582 Rotax Kitfox III

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Posted

Have a frustrating one here. I lose about 1/4 height of my overflow bottle (which looks like a large pill bottle for a Kitfox), over about 10 hours of flying.   Is any loss typical?

Seems to only be a small loss under pressure somewhere.  No external leaks that are apparent.  RV oil level is holding constant with no evidence of contamination. Looking up the exhaust into the cylinders and head/cylinder junction area show no evidence of leakage or even a static drop (though the engine is cold by then).  Next plan is to do a 10 psi hydrotest with internal cylinder inspection at that time.

Anyone run across this before?

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Posted

Rad cap top seal getting weak? Replace the cap.

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Posted

You can do a leak check of the coolant system.  Most auto parts stores these days will rent you tools if you don't want to buy one.  I pressured mine to 14 PSI and it held... but it still had a bad head gasket that leaked at higher pressures.  Are you getting any discoloration in the coolant bottle?  Triple check all hose connections.  Do you have a weep hole on the water pump shaft cover, block, what ever you want to call it that the RV shaft runs through?  Any evidence of leakage or weeping there?

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Posted

You can do a leak check of the coolant system.  Most auto parts stores these days will rent you tools if you don't want to buy one.  I pressured mine to 14 PSI and it held... but it still had a bad head gasket that leaked at higher pressures.  Are you getting any discoloration in the coolant bottle?  Triple check all hose connections.  Do you have a weep hole on the water pump shaft cover, block, what ever you want to call it that the RV shaft runs through?  Any evidence of leakage or weeping there?

Actually no discoloration in the coolant bottle at all (still looks like new coolant in the bottle and under the cap when I take it off).  All connections dry as can be (yep, have been over them at least 3 times, o.k. maybe 5 times).  The weep hole I am not familiar with however.  Not sure if I have one or not. If I do, I assume it is on water side of the shaft vice the RV side?   I have no drips anywhere on the engine (oil or coolant).  I have a 13 psi cap, so I guess the only regions of higher pressure would be whatever head the pump creates.  Hopefully it will make itself evident. 

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Posted

Leni is right, check/replace your rad cap.  I was loosing coolant and the temp was 190ish, it was coming out from the cap. Replaced=prolemo solved!

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Posted

Same thing happened to me.

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Posted

I will give that a quick go (cap change).  Easy one to implement.

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