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Thread: Question on a o290-D2

  1. #1
    Doug Budd's Avatar
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    Question on a o290-D2

    Does the Lycoming 0-290 and 0290 D2 use the same cylinders


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  2. #2
    TurboBeaver's Avatar
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    Yes and No Doug.
    The clyinder is the same but valves are different intake is larger and its not as simple as just regrinding the Allison seat as you will have to remove so much metal to get the tulip to fit you wont have enough left to dissipate the heat.
    So really only way to convert them over is to remachine the cly head to accept the larger Allison seat for the 0320 size valve. Gets iffy then as you will want to go 1/2" vs the old 7/16 stems, now your into new guides........
    So it winds up as a " White tag" instead of a "yellow tag" rebuild. I had Divco do a few sets with 0320 valves, seats
    And guides. They work great but sorta in the " grey area".
    Thanks flynlow thanked for this post
    Likes mike mcs repair liked this post

  3. #3
    n40ff's Avatar
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    Certified? If experimental the most cost effective thing is to machine the cases to use O320 cylinders. Certified, you have to pay for high $ O290 parts unless you find a bard full of NOS cylinders at a yard sale.

  4. #4

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    A little spin off on this question. I have an O-290 here that has been sitting, never run for about 25 years. It has an O-360 oil sump & tag on it such that this would be EX only and obviously quite misleading to what the engine truly is.
    Is there an easy visual from the outside if this might have the larger or smaller intakes in it?

  5. #5
    supercrow's Avatar
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    Quote Originally Posted by CharlieN View Post
    A little spin off on this question. I have an O-290 here that has been sitting, never run for about 25 years. It has an O-360 oil sump & tag on it such that this would be EX only and obviously quite misleading to what the engine truly is.
    Is there an easy visual from the outside if this might have the larger or smaller intakes in it?
    Maybe you could take a rocker cover off and check valve stem size?

  6. #6

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    Quote Originally Posted by supercrow View Post
    Maybe you could take a rocker cover off and check valve stem size?
    I expect I did not pay enough attention to the intake stems when I put this engine up on a work stand last spring. Easy enough to do later today.

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