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  1. #1
    skiversinc's Avatar
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    Question Engine mount fittings - removable?

    I've just bought a new hull to transfer everything to, as my old hull was suffering from stress cracks - badly!
    The idiot I bought it from had decided to strip the hull for spares, but couldn't remove the engine mount bolts. (obviously doesn't read this forum). As you can guess, he took an angle grinder to the heads and now I'm having problems removing them. I've got 3 out of 4 out by welding a nut onto the top of the studs & removing them that way. The other one didn't want to be welded and has blown into the fitting.
    I could drill it & re-tap it, but I wondered if the fitting itself is removable? I've seen similar fittings for wood & composites which are screwed in via allen key, but I don't want to damage the SMC of the hull.
    If I were to drill out the fitting, could I use one of these fittings or will this damage the hull?
    Just thought I'd ask.
    Anyone else had this problem?


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    How deep into the hull fitting has the broken bolt recessed?

  3. #3
    skiversinc's Avatar
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    Quote Originally Posted by K447 View Post
    How deep into the hull fitting has the broken bolt recessed?
    It's only a couple of mm down, but the weld has joined the stud to the fitting. I could drill that part out and go for the rethread option but thought I'd see if the fitting is replaceable to make it more secure.

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by skiversinc View Post
    It's only a couple of mm down, but the weld has joined the stud to the fitting. I could drill that part out and go for the rethread option but thought I'd see if the fitting is replaceable to make it more secure.
    hmmm.

    What I did once was use a Dremel cutting wheel to create a screwdriver slot in the end of the bolt (which meant also a couple of mm down into each side of the hull fitting), then eased it out with a manual impact screw driver.

    Perhaps you could drill out the upper portion until the weld is just released, then cut a slot part way into the fitting and into the bolt end.

    Someone else will have to comment on how much excess material those hull inserts have. Drill and rethread with a larger tap might create a fragile result.

  5. #5
    skiversinc's Avatar
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    I think I'll give that idea a try first. Sounds like it has a fair chance of working.
    Thanks for the tip.

  6. #6
    Madmark73's Avatar
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    You can buy Left hand rotation drill bits...try one..sometimes they will grip enough to unscrew the stud

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