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912 uls Blew out coolant

  • frednorthup@allstate.com
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2 months 2 weeks ago - 2 months 2 weeks ago #19623 by frednorthup@allstate.com
912 uls Blew out coolant was created by frednorthup@allstate.com
I just had an coolant problem and it emptied my reservoir . Not even sure where it came out . Could it be a bad cap? I don't see any problems and the CHT never got near the red.
It was a hot day in a heavier than normal climb out.
I Ordered new hose and clamps I plan to start there as it could have leaked past the clamp. I tried to get it to leak somewhere but nothing leaks under normal operation.
Last edit: 2 months 2 weeks ago by frednorthup@allstate.com. Reason: correction

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2 months 2 weeks ago #19625 by Bill Hertzel
Replied by Bill Hertzel on topic 912 uls Blew out coolant
Are you saying you had to add a Gallon+ to refill the whole Cooling System, or just a Pint to refill the Overflow/Reservoir?

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2 months 2 weeks ago - 2 months 2 weeks ago #19639 by frednorthup@allstate.com
Replied by frednorthup@allstate.com on topic 912 uls Blew out coolant
Hello Bill

I only had to refill the reservoir tank. The system itself was almost full still.
It happened again this morning but only lost a cup full before I leveled off . I did replace a hose yesterday and maybe had some air stuck somewhere. I can't see anyway directions to bleed it>
All gauges remained it the green.
Thank you
Last edit: 2 months 2 weeks ago by frednorthup@allstate.com. Reason: correction

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2 months 2 weeks ago #19640 by Bill Hertzel
Replied by Bill Hertzel on topic 912 uls Blew out coolant
It could just be that it just hasn't refilled itself yet.
It should be 100% full.
It will pull in more coolant during each cooling cycle.
Manually fill the expansion tank 100% and half fill the overflow reserviour.
If you replaced a hose it should resolve itself after a few heat/cool cycles.

If it is leaking and it is not obvious, it could be leaking into the cylinder and out the exhaust.
This is a common fault in cars but extremely unlikely in a Rotax unless there is a flaw in the head casting.
The exhaust would be steaming, and the offending cylinder would have a steam cleaned sparkplug as evidence.
I only add this thought in case all else fails. I would be surprised if this is the problem. So don't flame me, guys! :lol:

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2 months 2 weeks ago #19642 by jiott
Replied by jiott on topic 912 uls Blew out coolant
Could it be your pressure cap is faulty and not maintaining correct pressure in the cooling system? A very low pressure would allow the coolant to boil, which would then blow steam into the overflow bottle and possibly push coolant out the vented cap.
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2 months 2 weeks ago #19662 by frednorthup@allstate.com
Replied by frednorthup@allstate.com on topic 912 uls Blew out coolant
It is definitely coming out the reservoir cap and spits out all over so I know it not a cylinder
I ordered a new cap . If I baby it in the climb it doesn't do it at all only if I work it hard.

Thanks guys

On to the next issue my new tach starts blinking at some rpms and I have to reset. Plugs have about 30 hours but I am starting there.

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2 months 2 weeks ago #19666 by Roger Lee
Replied by Roger Lee on topic 912 uls Blew out coolant
I don’t know how old the engine is, but it may have a .9 bar cap. This was replaced years ago to a 1.2 bar cap. About 18 psi and like others stated it may just need a new cap.

Roger Lee
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Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
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2 months 2 weeks ago #19669 by frednorthup@allstate.com
Replied by frednorthup@allstate.com on topic 912 uls Blew out coolant
Thanks Roger
On My other issue .Left side ignition drops more RPM than the right and triggers my tach to blink. I am starting with plugs 1 and 2 top then I will do the bottom 3 and 4. If that doesn't work go to caps and wires?
The plane is about a 2003-04 Most likely everything but the plugs are original.

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2 months 2 weeks ago #19674 by Roger Lee
Replied by Roger Lee on topic 912 uls Blew out coolant
Rpm drop by how much and at what rpm?

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2 months 1 week ago #19696 by frednorthup@allstate.com
Replied by frednorthup@allstate.com on topic 912 uls Blew out coolant
Left side drops about 200 and the right about 80 at 3800. They were pretty even then I replaced the tach with a digital one and it starts blinking if the rpm varies more than 120 . I don't exactly how it works but it starts blinking several times during a flight and just reset it.
I started with replacing 2 plugs on 1 and 2 top did not solve it so I will change 3 and 4 bottom next.

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2 months 1 week ago #19698 by jiott
Replied by jiott on topic 912 uls Blew out coolant
I had an unstable tach readout on my Dynon EFIS. I put in a 20K ohm resistor in the tach wire as recommended by Dynon and the problem went completely away.

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2 months 1 week ago #19699 by frednorthup@allstate.com
Replied by frednorthup@allstate.com on topic 912 uls Blew out coolant
Are you thinking it might send power surges when throttle changes? Plus that difference in rpm right and left on run up doesn't seem right. Could the carb balance cause it? I just ordered my own balancer so now I can test it more often .

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2 months 1 week ago #19714 by frednorthup@allstate.com
Replied by frednorthup@allstate.com on topic 912 uls Blew out coolant
Update is the cap might have helped the coolant issue .I pushed it pretty hard taking off with 2 adults Temp in the 80s and could not make it leak from the tank.

The ignition problem seems to be a loose fitting plug cap. Boy are those expensive $16 each!

Thank you for the inputs.
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