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Thread: O-200 to C-90

  1. #1
    RaisedByWolves's Avatar
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    O-200 to C-90

    Hey guys, I was looking with not much luck, but is there a service letter or any info on converting a O-200 to C90. Is the cam the only difference?

    Thanks
    Tom


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  2. #2
    behindpropellers's Avatar
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    Quote Originally Posted by RaisedByWolves View Post
    Hey guys, I was looking with not much luck, but is there a service letter or any info on converting a O-200 to C90. Is the cam the only difference?

    Thanks
    Tom


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    I think the rear case mounting is the same as a C-90-16 for an 0-200.

  3. #3

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    There is a conversion service letter that states it (the service letter) is FAA approved. Not sure it covers that exact conversion. I'll try to dig it up.
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    Grand Pooh Bah soyAnarchisto's Avatar
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    My understanding is the service letter you are referring to (link below) allows conversion from sub-model (letter) to another letter. To convert an entire model to another model, you need a new serial number from TCM. I'd be interested to know if you think this is possible - but my reading of this does not look good. Why not just sell it, and buy what you want in a core for core exchange?

    http://www.tcmlink.com/pdf2/m75-6r1.pdf

    Quote Originally Posted by bob turner View Post
    There is a conversion service letter that states it (the service letter) is FAA approved. Not sure it covers that exact conversion. I'll try to dig it up.

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    Quote Originally Posted by soyAnarchisto View Post
    My understanding is the service letter you are referring to (link below) allows conversion from sub-model (letter) to another letter. To convert an entire model to another model, you need a new serial number from TCM. I'd be interested to know if you think this is possible - but my reading of this does not look good. Why not just sell it, and buy what you want in a core for core exchange?

    http://www.tcmlink.com/pdf2/m75-6r1.pdf
    C90 and O-200 are sub models of the same Type Certificate.


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    Ah, now I have to go look. Just when I was getting comfortable on the couch. . .

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    Service Bulletin M47-16 with supplement 1 dated Feb 26,1960. But none of these specifically address the O-200. Might look at them anyway, since they have generic hints buried in them.

    The SB was eventually cancelled by Continental, but since Continental does not have authority to change FAA- approved data, the SB can still be relied on.

    According to Continental customer service (Harold Ames) you can convert a C-85 to a C-90 with a logbook entry, so long as you re-stamp the data plate. I stopped reading after that little morsel.

  8. #8
    Doug Budd's Avatar
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    Quote Originally Posted by RaisedByWolves View Post
    Hey guys, I was looking with not much luck, but is there a service letter or any info on converting a O-200 to C90. Is the cam the only difference?

    Thanks
    Tom


    Sent from my iPhone using Tapatalk
    I did it experimental. Changed the cam and used chamfered c85 pistons. It really woke it up


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    Likes cubdriver2 liked this post

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