Oil cooler flush

by Neil Cooper in 912 / 914 Technical Questions 7 years ago

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Re: Oil cooler flush

by Roger Lee » 7 years ago

Roger Lee

125 5.12k 4.53k

Try re-torquing the bolts in the area.
One way to find hard to detect leaks is to spray the Desenex Foot Powder on suspected areas. It is a white powder and sticks to the metal. Run the engine and you may find weeps that you never knew about. dark oil on the white powder stick out like a huge flag.

Question:
This may seem unrelated, but
What is your wide open throttle rpm in level flight?

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: Oil cooler flush

by Neil Cooper » 7 years ago

Neil Cooper

23 67 92

Do you happen to know the torque of those bolts? Powder is is good idea. I gues the rest blows away and leaves the telltale of the leak. Do you think it's a minor type thing or a crack in the crankcase. It appears to be from the seem rather than a crack. My WOT in cruise is 5500rpm. Which is the minimum I'd like . I might be getting a new prop soon (if my engine is ok.) which I think I will pitch slightly higher.

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Re: Oil cooler flush

by Bill Hertzel » 7 years ago

Bill Hertzel

13 1.95k 7.96k

According to The Manual...

M6 = 10 Nm (90 in•lbs) <---<<< (NOT Ft•lbs!)

Loosen before Re-Torquing.
It might be best to Re-Torque all 10 in a crosswise pattern.

Two of them are M8...

M8 = 24 Nm (17.7 ft•lbs)

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

Thank you said by: Neil Cooper

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Re: Oil cooler flush

by Neil Cooper » 7 years ago

Neil Cooper

23 67 92

Well, I replaced the oil pressure regulator with the new mushroom style one. That increased my oil pressure half a bar. Now I have installed a new mechanical gauge (psi) and all my oil pressure readings are good. I'm getting between 40 and 60psi depending in conditions. Problem solved. Thanks for the help.
Also after speaking with the aircraft engineers at my work, I tried their easy fix of putting Arildite along the seam where the oil seep was. Problem solved!

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Re: Oil cooler flush

by Bill Hertzel » 7 years ago

Bill Hertzel

13 1.95k 7.96k

Great News!

Let us know if the fix lasts.
There are many reports that all was good for 20-30 hours and then the problem returns.
The new parts may not be as important as just installing parts in a slightly different orientation.
If the problem returns, have a very detailed inspection of the area where the Mushroom Head seats in the pump housing.
If the seat is bad, the problem returns in time as the new parts wear quickly.
Let's hope that yours is a permanent fix! Good Luck!

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

Thank you said by: Neil Cooper

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Oil cooler flush

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