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Oil leak at oil temperature sensor

  • Paul Hamilton
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2 months 1 week ago - 2 months 1 week ago #16861 by Paul Hamilton
Paul Hamilton created the topic: Oil leak at oil temperature sensor
It appears I have an oil leak at the temperature sensor. I have taken it out, cleaned it, and reinstalled it twice now and it appears to still be leaking. I hate oil leaks......

Used the 243 thread sealer substitute Permatex high temperature thread sealer.

Is it my installation, I used the proper torque 15 NM (not the 88 inch pound mistake in the manual) or do I need a new probe. Anyone been here with this problem and found a fix?

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Last Edit: 2 months 1 week ago by Paul Hamilton. Reason: did not finish and accidently published

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2 months 1 week ago #16878 by Rob Seaton
Rob Seaton replied the topic: Oil leak at oil temperature sensor
Never heard of this problem. Are you sure it is not a leak from the sealing ball? see ASB-912i-007
Use 243, permetex is a watered down household version.
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2 months 1 week ago #16905 by Paul Hamilton
Paul Hamilton replied the topic: Oil leak at oil temperature sensor
yes Bob I did check the ASB-912i-007 and the ball in in there. In fact from putting paper towels and trying to trace the source of the leak it is not the temperature probe nor the sealing ball. It is above all that near the starter/stater case ABOVE the oil pressure probe as best I can tell. I was going to take off the starter and reinstall/torque. Is there some oil seal for a simple fix starter related? :-) I dread it being the interface with the stator case. :-(

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2 months 1 week ago #16907 by Rob Seaton
Rob Seaton replied the topic: Oil leak at oil temperature sensor
Sorry, but I think it will be the sealing surfaces between the stator housing and crankcase. Did you have the stator replacement done?
But check the starter oring first. When removing the starter just remove the nuts: Don't turn the long screws!
Also check-tighten the two screw/nuts adjacent to the starter mounting points.
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2 months 1 week ago #16917 by Paul Hamilton
Paul Hamilton replied the topic: Oil leak at oil temperature sensor
Yes I did the stator replacement at 90 hours, now I am at 240. I think, but do not rememnber for sure that I had some pesky leak before the stator change that I did not chase down.

Perhaps I should get the starter o ring and replace it in concert with the retorgue of the starter mounting bolts.

Meanwhile I will continue my diaper/paper towel investigation to try and isolate exactly where the leak originates. I get enough, but not to much oil indication with about 2 hours of flight.

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2 months 1 week ago - 2 months 1 week ago #16918 by Roger Lee
Roger Lee replied the topic: Oil leak at oil temperature sensor
I have recommend Desenex Foot Powder to find hard to locate leaks. Clean the area and spray the white powder around the suspected area. Then run the engine. No matter how small the leak is it will show up like a red flag against the white powder. Works every time. Then once located just wash off the powder.

p.s.
With this method you can find oozing or weeping you didn't even know you had because the human eye couldn't pick it up or the flowing air kept the area clean.

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: 2 months 1 week ago by Roger Lee.
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2 months 1 week ago #16923 by Paul Hamilton
Paul Hamilton replied the topic: Oil leak at oil temperature sensor
That is a great tip/trick. Thanks.

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1 month 3 weeks ago #17055 by Paul Hamilton
Paul Hamilton replied the topic: Oil leak at oil temperature sensor
yes Bob I did check the ASB-912i-007 and the ball in in there. In fact from putting paper towels and trying to trace the source of the leak it is not the temperature probe nor the sealing ball. It is above all that near the starter/stater case ABOVE the oil pressure probe as best I can tell. I was going to take off the starter and reinstall/torque. Is there some oil seal for a simple fix starter related? :-) I dread it being the interface with the stator case. :-(

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1 month 3 weeks ago #17056 by Paul Hamilton
Paul Hamilton replied the topic: Oil leak at oil temperature sensor
Yes it is between the stator case and the engine along the mating seam. Any possibility and can fix it by retorquing ther strarter or replacing an O ring?

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1 month 2 weeks ago #17112 by Jeffery Auen
Jeffery Auen replied the topic: Oil leak at oil temperature sensor
Same issue here. Started after stator work. I have removed, cleaned and reinstalled the oil temp sensor. Still leaks a tiny bit. I’ll check above the sensor tomorrow to see if it’s actually leaking at the case/stator seam and just dripping onto the sensor.

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1 month 2 weeks ago #17114 by Roger Lee
Roger Lee replied the topic: Oil leak at oil temperature sensor
You can try and re-torque. If all else fails it may need to be re-sealed. I know some with the stator replacement only applied a thin film of sealant on one surface. I preferred both surfaces with sealant. Then if one side was a little too thin or there was a micro gap the second surface sealed it. I do the same on the gearbox.

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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1 month 2 weeks ago #17134 by Rob Seaton
Rob Seaton replied the topic: Oil leak at oil temperature sensor
Bad boy Roger, where are the instructions for that method?
putting a layer on both sides can cause a "gasket effect". the surfaces are designed to only have a micro thin sealant, essentially metal to metal.
Worst case: If you put sealant on both sides of the crankcase you will lose oil pressure at operating temps due to the greater clearance caused by the "gasket".

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1 month 2 weeks ago - 1 month 2 weeks ago #17135 by Roger Lee
Roger Lee replied the topic: Oil leak at oil temperature sensor
Hi Rob,
I understand.
I know it isn't standard practice, but...
It can still be thin. My thin layer on each side may be less thick than many single layer applications. I've never had a leak in 18 years. We both know many people apply it too thick to start.

Besides I like being a bad boy once in a while...:)

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 month 2 weeks ago by Roger Lee.

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  • Paul Hamilton
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1 month 1 week ago #17145 by Paul Hamilton
Paul Hamilton replied the topic: Oil leak at oil temperature sensor
Yes it looks like my thin coat as directed by rotax on one side has not worked very well

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1 month 1 week ago #17147 by Rob Seaton
Rob Seaton replied the topic: Oil leak at oil temperature sensor
The surface may not have been clean, or the housing brushed against something during the stator replacement.
The correct procedure of applying the sealant on one side is not the problem.

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