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Thread: 912 exhaust connections

  1. #21
    Senior Member fastfred's Avatar
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    Default Re: 912 exhaust connections

    Thanks Jim. some guys do it and some do not?

  2. #22
    Senior Member Dave S's Avatar
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    Default Re: 912 exhaust connections

    Fred,

    The best explanation I heard on this procedure from an EAA tech counselor is that: 1) the loosely placed safety wire's purpose is to prevent broken spring parts from doing other mayhem should the spring come apart plus backing up the spring to keep the pipe together; and, 2) The silicon bead dampens vibration which could otherwise wear and elongate the holes and wear on the spring.

    So it's real, real cheap insurance and yup - did it here too
    Dave S
    Kitfox 7 Trigear (Flying since 2009)
    912ULS Warp Drive

    St Paul, MN

  3. #23
    Senior Member kmach's Avatar
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    Default Re: 912 exhaust connections

    The safety wire is very important on a pusher configuration, it keeps the larger broken spring part from going through the propeller.

    I do mine on the Kitfox, it would keep a broken spring so you could inspect to see were it broke. I've never had one break though, I do change them if they get any groove wore in the hooks.
    Kevin,

    Kitfox Outback
    912 ULS
    Airmaster AP332CTFH-WWR70W
    Summit Aircraft Wheel Skis
    C-FOXW

  4. #24
    Senior Member fastfred's Avatar
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    Default Re: 912 exhaust connections

    Anyone ever have a spring break? Good insurance but they look similar to a snowmobile spring and I have never had one break in 30 years of riding them. They are expose to heat and rust.

  5. #25
    Senior Member
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    Default Re: 912 exhaust connections

    I think they are far more likely to break on a pusher configuration where the little devils have the most chance of doing damage, especially if you didn't safety wire them. I've never had one break on me either, but have removed some that were quite worn, and if left to themselves would have eventually called it quits. I think the silicone will help keep them from vibrating and therefor have less wear. JImChuk

  6. #26
    Senior Member jiott's Avatar
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    Default Re: 912 exhaust connections

    I have replaced several that were on the verge of breaking; and I have had the silicone on from day 1, now 660 hours.
    Jim Ott
    Portland, OR
    Kitfox SS7 flying
    Rotax 912ULS

  7. #27
    Senior Member cap01's Avatar
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    Default Re: 912 exhaust connections

    i just had to remove the exhaust system to repair some cracks and a couple of the springs were worn so bad that there was so little metal left i could hardly see it, i don't know why they hadn't let go. they had almost 1100 hrs on them and had the hi temp silicone on them. when i installed the pipes i used silver anti seize
    chuck
    kitfox IV 1050
    912ul warpdrive
    flying B , yelm, wa

  8. #28
    Senior Member fastfred's Avatar
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    Default Re: 912 exhaust connections

    I would probably plan on replacing the springs more often but still I have not heard of one breaking.1100 hours is pretty good on a $3 spring

  9. #29
    Russell320's Avatar
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    Default Re: 912 exhaust connections

    Well...it’s my turn. Cracks in the muffler found during condition inspection. So far, after two days trying, I’m unable to get the headers out of the muffler on my 912UL. I’ve tried all things discussed in this thread.....and they ain’t budging.

    Any other ideas?......Thanks
    Russ
    Model IV Speedster
    912UL IVO IFA
    RV6A
    Needle, Ball and Airspeed
    Maybe a little GPS

  10. #30
    Senior Member kmach's Avatar
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    Default Re: 912 exhaust connections

    I would first try a penetrating oil on the joints, let it soak.

    if that didn't work , I would carefully heat the outer sleeve of the muffler that the header goes in.

    Maybe some careful striking on the joint to release the sieze.
    Kevin,

    Kitfox Outback
    912 ULS
    Airmaster AP332CTFH-WWR70W
    Summit Aircraft Wheel Skis
    C-FOXW

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