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Thread: mechanic needed Lycoming 540

  1. #1
    Member ArcherBob's Avatar
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    Oct 2006
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    Default mechanic needed Lycoming 540

    I’m having an issue with my lycoming 540. It sits on a 14’ Hull. It has toggle switches to turn off the magnetos one at a time, and the engine should continue to run on half the plugs. For no apparent reason it started doing this thing where I can run with both switches on or one on but if I turn the other off it stalls out. I’ve replaced the magneto that goes to the switch which was killing the engine, no luck! So without paying for A&P certified work $$$. Is there a mechanic around fairbanks that would work on this airboat and not charge aircraft mechanic prices?
    Bob

    Become one with Nature......... Then Marinade it.

  2. #2
    Member ArcherBob's Avatar
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    Has anyone near fairbanks ever owned an airboat with an aircraft engine and had any work done on it?
    Bob

    Become one with Nature......... Then Marinade it.

  3. #3
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    Default

    I have the lycoming 0-320 and I have seen info in the service manual on checking the magnetos. I understand that these are different engines, but I would imagine the principles to be similar. I gleaned that too big of a drop in RPM when shutting off a single magneto can be due to a mixture that is off. The links are below, perhaps they can help.

    https://www.lycoming.com/sites/defau...20Drop-Off.pdf


    http://11hc.44rf.com/manuals/engine-...aintenance.pdf

  4. #4
    Member ArcherBob's Avatar
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    Figured it out, it was my fault. When I put the rebuilt magneto in I had the gear 180* off. Running like a champ now. Thank you for the response!
    Bob

    Become one with Nature......... Then Marinade it.

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