Heli coiling
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Thread: Heli coiling

  1. #1
    Fellow Frogger!
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    Default Heli coiling

    The 2CV has shot a spark plug out of the head for the second time.
    How involved / costly is heli-coiling to fix this problem ?

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  2. #2
    1000+ Posts driven's Avatar
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    Easy process, re-tap hole insert helicol, reinsert spark plug, drive away
    Using plenty of grease on the tap to catch the swarf, can actually do it while in engine, save dismantling engine

  3. #3
    Now go make me a sandwich Hotrodelectric's Avatar
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    Quote Originally Posted by driven View Post
    Easy process, re-tap hole insert helicol, reinsert spark plug, drive away
    Using plenty of grease on the tap to catch the swarf, can actually do it while in engine, save dismantling engine
    Although, pulling a 2CV head can be done over the course of a lunch break. You're looking at about 40-50.00 for the kit (that's the drill bit, tap, driving tool and 4 or 5 Helicoils) or if you have a machine shop do it, maybe 100-125.00 all in.
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  4. #4
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    I got it done on my Mi16 in situ for $150 - see this thread.

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  5. #5
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    In situ or not is only part of the issue. If this is the second time it needs a helicoil then you might be looking at an oversize, no biggie, they're available. But if you need to take the head off consider having a machine shop drill the hole out and make up a sleeve and refit.
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