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Thread: How Not To Do It

  1. #1
    Steve Pierce's Avatar
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    How Not To Do It

    I see a lot of stuff done incorrectly for what ever reason and thought it might be an informative thread to see what kinds of things people find so that others won't make the same mistakes.

    This is an oil pressure line run from the right side of the firewall to the engine. Great idea, shorter run etc. however you now have to disconnect it when you swing the engine for normal maintenance. It is also in the way of getting the engine mount bolt back in.
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    Steve Pierce

    Everybody is ignorant, only on different subjects.
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    Steve Pierce's Avatar
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    Those holes drilled in the exhaust pipe to muffle should be through both pieces to retain them. Some folks in Florida got killed several years ago when someone used a hose clamp instead of the proper exhaust clamp with the tit in it.
    Never seen the hole in the slot before, probably not gonna work too well.
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    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers

  3. #3
    SJ's Avatar
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    Good stuff, Steve!

    sj
    "Often Mistaken, but Never in Doubt"
    ------------------------------------------

  4. #4
    behindpropellers's Avatar
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    Quote Originally Posted by Steve Pierce View Post
    I see a lot of stuff done incorrectly for what ever reason and thought it might be an informative thread to see what kinds of things people find so that others won't make the same mistakes.

    This is an oil pressure line run from the right side of the firewall to the engine. Great idea, shorter run etc. however you now have to disconnect it when you swing the engine for normal maintenance. It is also in the way of getting the engine mount bolt back in.
    Click image for larger version. 

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    The other thing that is wrong with this picture is that there is no loop in the oil line to absorb shock from the engine vibrating on the mount.

  5. #5
    Steve Pierce's Avatar
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    No loop needed with the flex line. Originally Piper did it like this except they used cooper tubing instead of aluminum. This way it swings with the engine.
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    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers

  6. #6
    RaisedByWolves's Avatar
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    Small continental exhaust nuts


    Little washer side of it goes up to the exhaust

  7. #7
    Cub junkie's Avatar
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    I use those small Continental brass exhaust nuts on Harley Davidson Evolution engines. I also use them on small Continental engines.

  8. #8
    skywagon8a's Avatar
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    Quote Originally Posted by Cub junkie View Post
    I use those small Continental brass exhaust nuts on Harley Davidson Evolution engines. I also use them on small Continental engines.
    I'm trying the long ones on my experimental I0-360 Cub. The long ones cover all the stud threads, which should prevent the studs from eroding outside the nuts as they normally do. The DAR questioned them and liked my idea.
    N1PA

  9. #9
    Steve Pierce's Avatar
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    The 10-32 machine screws that hold the fuel tank covers to the leading edge and false spar are supposed to only be 1/2" long so they don't damage the spar cap.
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    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers

  10. #10
    moneyburner's Avatar
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    This muffler made it through two annual inspections by two different shops, and I mentioned to both that I was getting exhaust in the cabin. The cracks are right where the hose for the cabin heat exits, 180 degrees from the seam in the shroud, pretty hard to get to. So, even with good mechanics, things get missed. We fixed everything else it could have been, but sometimes the most obvious solution is the correct one.

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    Quidquid Latine dictum sit, altum videtur

  11. #11
    Aviator's Avatar
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    Quote Originally Posted by Steve Pierce View Post
    The 10-32 machine screws that hold the fuel tank covers to the leading edge and false spar are supposed to only be 1/2" long so they don't damage the spar cap.
    Click image for larger version. 

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    Click image for larger version. 

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    The big question is, what to do if you do find such marring? Should I be affraid to pull the screws and look?

  12. #12
    Aviator's Avatar
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    Quote Originally Posted by moneyburner View Post
    This muffler made it through two annual inspections by two different shops, and I mentioned to both that I was getting exhaust in the cabin. The cracks are right where the hose for the cabin heat exits, 180 degrees from the seam in the shroud, pretty hard to get to. So, even with good mechanics, things get missed. We fixed everything else it could have been, but sometimes the most obvious solution is the correct one.

    Click image for larger version. 

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    You were lucky. It could have been worse. http://www.supercub.org/forum/showthread.php?20658-URGENT-!&highlight=muffler+split

  13. #13
    moneyburner's Avatar
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    Quote Originally Posted by Aviator View Post
    Yup, that's my thinking. Lucky as hell. Those little CO cards work, and if one is telling you there is a problem, believe it. I thought it was faulty or old or something, and that could have been it for me. Kept the window cracked and the heat wasn't being used, but I was still getting some bad air, just failing to believe it.
    Quidquid Latine dictum sit, altum videtur

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