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Thread: What's causing new vibration?

  1. #1

    Join Date
    Feb 2017
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    Default What's causing new vibration?

    I fly a 1954 PA-22-135. Since the annual a couple of months ago, there has been a noticeable increase in vibration, to the point that the compass is jittering around and my iPad mounted on the yoke is shaking.

    The annual was pretty much plain vanilla, but we did install a new muffler. I'm taking it back to the annual A&P for him to check, but I need some advice as to what could be causing it before we meet again.

    The vibration could be unrelated to the annual but I noticed it as soon as I took off after the inspection.

    What are your thoughts?

    William Bruce

  2. #2

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    Nov 2008
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    Default Re: What's causing new vibration?

    I know of several piper owners who are A&Ps, who when they do an annual, remove the prop and unbolt the cowling at the rear and pull it off as one unit. I once had the prop and front nose cone cowling off to do alternator belt replacement and put prop back on 180 degrees off my initial markings, Vibrations at 2,000 rpms and more in flight. Around the pattern and back to hanger, prop off , 180 degrees back to original settings, end of vibration. Had mags rebuilt, A&P took them off, sent to mag shop, he replaced and timed them. After several hours, drop between mags started to increase. One mag was not torqued tight and had moved. I rest set the mag timing and torqued it tight.

    Bob 1952 Pa-22

  3. #3

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    Default Re: What's causing new vibration?

    I would agree with bob if the prop was taken off that is the first place I would look.
    DENNY

  4. #4

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    Default Re: What's causing new vibration?

    Thanks guys. The prop wasn't taken off. Is it possible that snugging up a new muffler would cause this?

  5. #5
    gliderman's Avatar
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    Jan 2009
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    Default Re: What's causing new vibration?

    I just had a vibration problem recently
    Turned out to be a broken valve spring.I found it by turning the prop backwards and found no compression on one cylinder

    Another thought- are all the spark plug leads correct and tight...

  6. #6

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    Dec 2007
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    Default Re: What's causing new vibration?

    have them check the muffler system and tailpipe etc to make sure the new installation isn't hitting the motor mount. Sometimes the new stuff is just that much different and there isn't much clearance in those areas.
    Tom Ferraro
    PA22/20-160 N25TJ

  7. #7
    Administrator Steve Pierce's Avatar
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    Default Re: What's causing new vibration?

    As stated above, I would look the exhaust system over and see if something is rubbing on the cowling, firewall or engine mount.

  8. #8
    McDaver63's Avatar
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    Default Re: What's causing new vibration?

    Quote Originally Posted by WilliamBruce View Post
    Thanks guys. The prop wasn't taken off. Is it possible that snugging up a new muffler would cause this?
    William, was just curious. Did you ever find out what was causing the vibration?


    Sent from my iPad using ShortWingPipers.Org mobile app
    Both optimists and pessimists contribute to society. The optimist invents the aeroplane, the pessimist the parachute

  9. #9
    bvmbandit's Avatar
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    Default Re: What's causing new vibration?

    Were the engine mounts replaced?

    There will be a noticeable “difference” in vibration frequency when engine mounts are replaced....


    - Vern


    Sent from my iPhone using ShortWingPipers.Org

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