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Oil leak

  • Alan Arnold
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1 week 1 day ago #17730 by Alan Arnold
Alan Arnold created the topic: Oil leak
So I have this 912ULS. It is a early 2006 with 780 hours TTSN. For several months now I have oil seeping from between the case halves, top and bottom. Not much, but sometimes there is a small puddle under the engine.

I have a a 3 blade Whirlwind prop that has long been set per Roger's recommendation. Before that it was slightly less pitch for stol.

Will there be any long term problems from this condition, other than the mess, or do I need to do an overhaul, with new cases, halfway through TBO?

Alan

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1 week 1 day ago - 1 week 1 day ago #17733 by Roger Lee
Roger Lee replied the topic: Oil leak
Hi Alan,
Need a tad more info.
So you have oil on the floor all the time? (or coolant)
Are you absolutely sure it's from the case halves? This would be fairly rare. Could it be from the cylinder side of things?
If it's oil and confirmed from the case have you tried to torque the case bolts?
Is it the case half seams or possible cracks? Cracks can come from over pitching the prop and running way to low in WOT rpms and was more prevalent in the 1500 hr. engines.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell
Last Edit: 1 week 1 day ago by Roger Lee.

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1 week 1 day ago #17734 by Alan Arnold
Alan Arnold replied the topic: Oil leak
Hi Roger.

I'm going out to the airport this afternoon and I'll take a picture. I've been flying this engine for more than eleven years and I'm almost positive I've never flown it with too positive pitch. I'm going to check everywhere again but I know for sure oil is seeping from the top case halves.

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1 week 12 hours ago - 1 week 12 hours ago #17736 by Alan Arnold
Alan Arnold replied the topic: Oil leak
Ok. Here are a couple of pics. I looked all under the engine, at least as well as I could with all the pipes and hoses. There might be another leak from the starboard bottom of the accessory case or just from that top case leak working it's way down.

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Last Edit: 1 week 12 hours ago by Alan Arnold.

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1 week 12 hours ago #17737 by Roger Lee
Roger Lee replied the topic: Oil leak
That almost looks like it's coming up from the cyl. and drooling down.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

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6 days 17 hours ago #17738 by Alan Arnold
Alan Arnold replied the topic: Oil leak
So you're saying that the cylinder.base gasket is leaking and the air is pushing that oil up and over. I never thought of that. Thank you, Roger.

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6 days 8 hours ago - 6 days 8 hours ago #17744 by Roger Lee
Roger Lee replied the topic: Oil leak
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)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell
Last Edit: 6 days 8 hours ago by Roger Lee.
The following user(s) said Thank You: RotaxOwner Admin

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6 days 6 hours ago #17746 by Alan Arnold
Alan Arnold replied the topic: Oil leak
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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