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Thread: Oil cooler connections

  1. #1

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    Default Oil cooler connections

    On a 1956 PA-22 with 150 HP, How are the fittings sealed coming directly out of the stock oil cooler? I know the stock oil tubes have O ring compression fittings. There are 90 degree fittings on each side of the cooler they appear to have pipe threads. I am not seeing Teflon tape. also not seeing any flange that would allow O ring to compress and seal

  2. #2
    Rik's Avatar
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    Default Re: Oil cooler connections

    On my 56 the fittings are pipe threads going into the cooler. The 90 degree fittings connect to the tubes with a rubber compression fitting (sort of a sleeve) Univair has them

    http://www.univair.com/piper/piper-p...per-ring-seal/

  3. #3
    Administrator Steve Pierce's Avatar
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    Default Re: Oil cooler connections

    This is what I use on the threads.
    15-06149.jpg

  4. #4

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    Default Re: Oil cooler connections

    Thanks Guys this is exactly what it looked like to me. I put in new compression fitting I still have misty oil on the bottom of the motor. I think the 90 degree fittings into the cooler, The pipe thread is leaking

  5. #5
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    Default Re: Oil cooler connections

    A good way I have found to isolate leaks like this is to tie a rag around the suspected fitting. A lot if time something will leak and with the airflow in the engine compartment make it look like other things are leaking. Can be very frustrating.

  6. #6

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    Default Re: Oil cooler connections

    Fixed it this weekend. Plain old Teflon tape on the threads into the oil cooler and just for the heck of it a dab of RTV on the rubber gasket for the tube side. Let it set for a couple hours while farting around with other stuff. It works great does not leek, engine is clean and now the underside of my plane is clean as well

  7. #7
    Administrator Steve Pierce's Avatar
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    Default Re: Oil cooler connections

    Teflon tape is not a common practice on aircraft oil, fuel and hydraulic fittings but glad you got it stopped.

  8. #8

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    Default Re: Oil cooler connections

    the fittings coming out of the oil cooler are pipe thread and the other side of the fitting is some type of o ring seal. At any rate the threads coming immediately out of the cooler was the problem. But not any more, Its sealed and I am happy.

  9. #9
    Subsonic's Avatar
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    Default Re: Oil cooler connections

    Old thread not directly applicable but here goes: Does Anyone have a source for the large brass gland nuts that hold the oil cooler to the brackets on each side? Mine are pretty beat up.
    Thx,
    Subsonic

  10. #10
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    Default Re: Oil cooler connections

    I couldn't find a part number. I might have some that are in good condition.

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