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Thread: 912 exhaust connections

  1. #11
    Senior Member jrevens's Avatar
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    Default Re: 912 exhaust connections

    Loctite is one brand, Dave. You can get it at W.W. Grainger's, some auto supply stores, on-line at ebay, etc. It's good for about 600 deg. higher than the copper-based products - actually about 2400 deg.
    John Evens
    Arvada, CO
    Kitfox SS7 N27JE
    EAA Lifetime
    Chap. 43 honorary Lifetime

  2. #12

    Join Date
    Oct 2011
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    Canada
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    187

    Default Re: 912 exhaust connections

    >>Going back with a nickel base anti-seize. <<

    That is the best stuff I use
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  3. #13
    Senior Member
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    Bryan, Texas
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    Default Re: 912 exhaust connections

    After going through this and royally screwing it up I suggest that anyone working on a 912 exhaust take the time, sand, align and use the nickel anti-seize. I had been smelling exhaust in the cockpit and thought it was just blowing up from the tailpipe but it was the cracks leaking. Caught them on the condition inspection. Now that I have it fixed, I can pull on the muffler and I can move the pipes in the collars and stretch the springs. Way better and hopefully no more cracks. Grainier supply sells the nickel anti-seize. Most auto stores can order it so you don't have to pay shipping.

  4. #14
    Senior Member Peteohms's Avatar
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    Default Re: 912 exhaust connections

    Quote Originally Posted by jrevens View Post
    Hi Jerry,

    There are all kinds of things you can try. Gentle tapping with a plastic mallet, then application of heat around the perimeter of the outer tube... don't leave the heat (e.g.- propane torch) on too long. The idea is to expand the outer tube without too much heat soaking through to the inner tube. I've also had some success with Mouse Milk. You can get that from Aircraft Spruce. Let it soak in for awhile. Another thing to try- heating, then plunging into ice water...
    I had occasion to look up this thread. Over the years I've had to remove my muffler and exhaust a few times. Had to remove head from #3 this week and the exhaust was stuck big time to the muffler. Thought I was safe because I always use anti seize. Well I pretty much used the above advice and other tricks. I finally made a concoction with 50-50 aircraft break fluid and soaked the joint several times and hung 150#s on the end of the muffler. I stopped and picked up some dry ice on the way to the airport to cold soak the exhaust while I planned to heat up the muffler at the connection. I had also made a tool to push the two apart and installed it Friday to leave the weekend for it to sit and absorbe the 50-50 brew. Turns out I didn't use the dry ice. I screwed my contraption a couple turns this morning and saw about 1/32" movement. I tapped on the joint with a plastic hammer and after a few taps, the 150#s pulled it apart.
    The picture below was taken after I got the exhaust off #3. I just placed the tool on this exhaust to show how simple it is.
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    Pete
    Leander, TX
    Model III SN 1000
    912
    Grove

  5. #15
    Super Moderator Av8r3400's Avatar
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    Default Re: 912 exhaust connections

    Pete, that is absolute genius! Going to make one of those this weekend!
    Av8r3400
    Kitfox Model IV
    The Mangy Fox
    912UL 105hp Zipper
    YouTube Videos

  6. #16
    Senior Member Peteohms's Avatar
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    Default Re: 912 exhaust connections

    I don't show it in the photo but you'll need to put some shims between the tool and exhaust to keep some space to turn the nut.
    Pete
    Leander, TX
    Model III SN 1000
    912
    Grove

  7. #17

    Join Date
    Jan 2009
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    Lakewood, CO
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    Default Re: 912 exhaust connections

    Mouse Milk works wonders getting "stuck" exhaust parts apart. Available through Spruce.

    Stan Specht
    Denver, CO
    Model IV Speedster
    2390 hrs on 912ul

  8. #18
    Senior Member Peteohms's Avatar
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    Default Re: 912 exhaust connections

    Used Mouse Milk, Moose Milk, Kroil, spray this, dribble that and nothing worked until two friends of mine, one of whom was a machinist, told me to use 5606 and acetone 50/50. Left it soaking for 2 days.
    Pete
    Leander, TX
    Model III SN 1000
    912
    Grove

  9. #19
    Senior Member fastfred's Avatar
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    herkimer,ny
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    Default Re: 912 exhaust connections

    This question is related to the exhaust connections. Does anyone wire the springs in place?

  10. #20
    Senior Member jiott's Avatar
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    Portland, OR
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    Default Re: 912 exhaust connections

    Yes, you safety wire the springs thru the center, not too tight because you want the springs to be able to flex. Then run a 1/4" bead of hi temp silicone along the length of the spring to damp out resonant vibrations.
    Jim Ott
    Portland, OR
    Kitfox SS7 flying
    Rotax 912ULS

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