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Thread: Strange Cylinder Base Bolts

  1. #1

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    Strange Cylinder Base Bolts

    The bolts on the base of the cylinders on my old O-320B2B are for internal wrenching. The socket is not hexagonal but rather looks like it needs a Torx-type wrench.

    The cylinder base wrenches that I have are for internal hex-head bolts, and I don't see what I need at Aircraft Spruce.

    Can someone let me know where I can find such and animal?

  2. #2

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    Quote Originally Posted by NunavutPA-12 View Post
    The bolts on the base of the cylinders on my old O-320B2B are for internal wrenching. The socket is not hexagonal but rather looks like it needs a Torx-type wrench.

    The cylinder base wrenches that I have are for internal hex-head bolts, and I don't see what I need at Aircraft Spruce.

    Can someone let me know where I can find such and animal?
    Did you try a 12 point socket?

  3. #3
    tcraft128's Avatar
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  4. #4

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    Quote Originally Posted by pilotski View Post
    Did you try a 12 point socket?
    The bolt has a recessed socket. Wrenching is internal. Outside of the head is round. Socket won't work.

  5. #5

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    Thanks, but that link wouldn't work for me.

  6. #6
    eoliverosh's Avatar
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    Eduardo Oliveros
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  7. #7

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    Quote Originally Posted by eoliverosh View Post
    Thats what I have. Hex head wrench but the socket has many more "points" than six. Maybe hex wrenches will work but I was afraid to mess up the sockets. I'll try again tomorrow and see if I can make them work.

  8. #8
    Gordon Misch's Avatar
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    I made my own base wrenches for that style nut. I used the heads from grade 8 bolts welded onto an appropriately shaped shank. 6 points worked fine. Kinda like 6 point bolts and nuts being turned with 12 point sockets. I don't recall whether I hardened the bolt heads after welding. Probably did though, with a diesel fuel quench - -
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  9. #9

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    Well, that's encouraging. Maybe the wrenches I already have will work after all.
    Thanks guys.

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  11. #11
    skywagon8a's Avatar
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    The Lycoming wrenches are 6 point and the sockets are 12 point. You have the right wrenches.
    N1PA
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  12. #12
    Steve Pierce's Avatar
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    You have a narrow deck engine and need a set of narrow deck cylinder base wrenches.
    http://www.supercub.org/forum/showth...deck-vs-narrow
    Steve Pierce

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  13. #13
    skywagon8a's Avatar
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    Larry, Just make sure that the wrenches are square to the nuts when you use them. Over time misuse can wear the internal 12 points. Normally this is not an issue.
    N1PA
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  14. #14

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    Did what Gordon did. He's real smart.
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