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Thread: Rough O200A

  1. #1
    Member paulk's Avatar
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    Feb 2012
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    Queen Creek, AZ
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    Default Rough O200A

    Hi All,

    When I purchased my used (~300hr) Sport Cub, the engine would occasionally run a bit rough. Playing with the mixture or carb heat would sometimes smooth things out a bit, but it just never ran “right”. You probably know what I mean, you cant put your finger on it exactly, you just sense all is not well. I had flown a few dozen hours behind other O200s (some better than others) so I had a general sense of what normal was for these engines.

    I decided to install an engine monitor, mostly to keep track of CHTs but installed the EGT probes to help diagnose the roughness problem. I hate throwing parts at a problem in hopes that the problem just goes away. Anyway, after downloading the engine data from a few flights it was evident that the intake hydraulic lifter on one cylinder was misbehaving. After replacement the engine is now super smooth, well as good as any other O200 I have flown behind I now have around 15 hours after the fix now, so I’m confident that the problem is solved.

    Hopefully this information might be of help to others. If anyone has a question please drop me a message.


    Paul K.

  2. #2
    Administrator Pete D's Avatar
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    Jan 2010
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    Yakima, WA
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    Default Re: Rough O200A

    Thanks for the tip!
    Pete Dougherty
    Customer Support Manager
    Cub Crafters Inc

  3. #3
    Senior Member
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    Jan 2010
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    Edgewood, Texas
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    214

    Default Re: Rough O200A

    What type engine monitor did you install and where did you put it?
    Jon

    Quote Originally Posted by paulk View Post
    Hi All,

    When I purchased my used (~300hr) Sport Cub, the engine would occasionally run a bit rough. Playing with the mixture or carb heat would sometimes smooth things out a bit, but it just never ran “right”. You probably know what I mean, you cant put your finger on it exactly, you just sense all is not well. I had flown a few dozen hours behind other O200s (some better than others) so I had a general sense of what normal was for these engines.

    I decided to install an engine monitor, mostly to keep track of CHTs but installed the EGT probes to help diagnose the roughness problem. I hate throwing parts at a problem in hopes that the problem just goes away. Anyway, after downloading the engine data from a few flights it was evident that the intake hydraulic lifter on one cylinder was misbehaving. After replacement the engine is now super smooth, well as good as any other O200 I have flown behind I now have around 15 hours after the fix now, so I’m confident that the problem is solved.

    Hopefully this information might be of help to others. If anyone has a question please drop me a message.


    Paul K.

  4. #4
    Member paulk's Avatar
    Join Date
    Feb 2012
    Location
    Queen Creek, AZ
    Posts
    30

    Default Re: Rough O200A

    It's a JPI 730, which fits in a standard instrument hole. Mine is just to the right of the avionics stack in the lower factory hole.

    Paul

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