Oil leak
in 912 / 914 Technical Questions
8 years ago
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by Roger Lee » 8 years ago
Clean the area good and fly some more and just keep a closer eye on it or run it on the ground so the air flow doesn't move it around.
I have seen many an oil leak that an owner would have bet his last dollar on where it was coming from. I'm sure that other Rotax mechanics have been fooled and I'm in that same boat. The air flow through the cowl in flight can sure make you look dumb. I have seen oil from the oil cooler fittings up in front of an engine be absolutely spotless and oil all over the back of the engine. All that needed to be done was tighten the oil cooler fittings that showed no oil. Now when I see oil in the back of the engine I start up front to diagnose where the leak may be. It may be coming from the back, but to be thorough you need to rule out everything or multiple leaks.
I've seen where oil was on the bottom of the cylinders and owners swore that's where it was leaking and it was the oil filter all along and the air flow blew it back.
Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell
Thank you said by: RotaxOwner Admin
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by Alan Arnold » 8 years ago
Ok. Thank you for all that. It sure would be nice to find the leak from a more friendly spot. I'll keep looking. :-)
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by Damien Gates » 4 years ago
Hi Alan, did you find the source of this leak, particularly on the top. Did you fix it?
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by Rotax Wizard » 4 years ago
Hi Alan
I would clean it up with some spot cleaner like brake clean (just the stain you can see, don't wash the whole engine off) Take a clean pad and tape it to the top of the engine area where it is stained. Do some test flights and look for where the stains are on the pad. Under the pad by the case seam you have an issue. It might as Roger suggests be coming from a cylinder O-ring or even from the rear prop shaft seal. This area of the engine usually gets a lot of turbulent air when flying due to the gearbox so oil can migrate from other areas and deposit there. Best to check and see from where.
Please check the crankcase serial number. Early 2006 still used a consecutive serial number...like XXXXX, all numbers together. Mid 2006 they changed the crankcase and the serial will be year, then a separation and the number within that year like XX . XXXX The crankcase serial is located on the lower side between the cylinders and will be stamped into the case (not the cast numbers but stamped in)
Cheers
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by Damien Gates » 4 years ago
Rotax Wizard Alan's post was from 2018 so he may have found the problem. That is the reason for my inquiry.
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