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Any way to repair a leak at the drain plug fitting, aside from replacement of the $850 oil tank?

It seems a stupid mechanic/owner/builder (me) didn't properly hold the fitting while replacing the plug on the last oil change. The fitting is slightly askew and now has a very slow drip.

Alan
  • Re: Oil tank leak 912ULS

    by » 6 years ago


    Sounds like someone applied too much torque.
    You have only two choices. Either replace it or take it to someone who can weld stainless.

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


  • Re: Oil tank leak 912ULS

    by » 5 years ago


    I just purchased this airplane and flew it about 17 hours to my home airport. During that time I noticed a small amount of oil along the belly of the plane developing. Upon doing some investigating I found this on the bottom of the oil tank. Is that a bolt that screw into the tank or is it welded or molded into the tank? Will this require a new tank replacement? This is on a 912ULS.

    24211_2_IMG_0064.jpg (You do not have access to download this file.)
    24211_2_IMG_0065.jpg (You do not have access to download this file.)

  • Re: Oil tank leak 912ULS

    by » 5 years ago


    If it were me, I would carefully clean the area around the bottom of the oil tank and see if I could better pinpoint the leak's source (a little talcum powder helps to ID the source).  Potentially the leak could be from the copper o-ring between the boss and the quick-drain fitting or the small o-ring inside the quick-drain itself -- you can replace this O-ring with a new one. The boss (nut-like thing at the bottom of the tank) is welded to the bottom of the tank.  You may find that someone previously tightened/removed the quick-drain fitting incorrectly and over-stressed the boss creating a leak.  The correct way to tighten/remove the quick-drain or the OEM plug is to "double-wrench" the assembly so as to not stress the boss/tank bottom interface.

     


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