Not much left above the stringer. Tried a drill out but broke the drill bit. I'm thinking a hole saw is the only thing left but open to ideas.
Thread: Broken lag bolt removal?
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08-16-2009 06:42 PM
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08-16-2009 09:33 PMNeed a little more info and a pic maybe? Where is it, how deep, etc.
Getting bad advice is unfortunate, taking bad advice is a Serious matter!!
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08-16-2009 09:49 PMIt was an engine mount lag bolt. Probably 2.5-3" long. What else can I tell you? There's not much to take a picture of. It looks like.....a bolt with the head broken off.
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08-16-2009 11:15 PMDid you Try a Left Hand Drill Bit??? Bolt Extractor??
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08-16-2009 11:22 PMEngine mount lag bolt ??????? mhhh never seen that,,the ones i used and always seen are trubolted.
If its smaller then 1/2 inch,,,take a 1/2 inch drillbit and drill it completeley tru and later stick a tru bolt in there with a washer and locknut !!!!
Don't use a cheap bit.
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08-16-2009 11:26 PM
You should be able to drill into it and use an "easy out"
I've never had a broken bolt that couldn't be drilled and come out that way as long as you have good access to it.
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08-17-2009 08:31 AM
There are quite a few boats that lag the engine mounts. They are lagged through the top of the stringer so you can't through bolt them without new mounts. My baja used to be like that.
An easy out should work just fine but your gonna have to drill into the bolt. They aren't usually hardened bolt so it should drill pretty easy.
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08-17-2009 08:40 AM
leave the bolt alone, if the head is off , remove the mount modify it either lengthen it or shorten it , so a new hole can be drilled about a half inch away.obviously the stringer is sound, if you broke the head off. or use differant mounts like dd said and thru bolt them, good luck
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08-17-2009 09:54 AMNo thru bolt mounts, and highly unlikely that a factory Volvo engine mount will get modified for relocation.
It's a stainless bolt and it's not giving up easily. My buddy tried a bolt extractor but broke the bit inside the bolt.
No thoughts on using a hole saw to extract and then dowel/resin/glass the hole?
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08-17-2009 11:04 AM
Do you have enough surface area to just rotate the mount one direction or the other and just drill a new hole to lag into? The mounts can be installed crooked as long as the verticle stud remains in roughly the same location. Mine from the factory were mounted as crooked as a dog's hind leg on the stringer block.
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08-18-2009 11:59 PMI would try and weld a bolt to it and then twist it out.
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08-19-2009 05:01 PM
Cut the thing off flush with the stringer and put an L bracket in there
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08-22-2009 10:52 AMHole saw is a bad idea. Previous post is a good one- saddle mounts.
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08-22-2009 07:19 PMThanks guys. FWIW, this is for a buddy's cruiser. Twisting the mount is IMHO the best/easiest, but dude's a little retentive so we'll see. Doesn't help that the whole reason we pulled the lag bolts was because the mount nuts would not budge. Yet he things everything will just drop back in without having to adjust them....you can only lead a horse so far...
Paycheck, nice drawings! But the friggin' stringers on this pig are 8 inches wide. Just too much material and effort.
The weld thing works easy when it's a steel bolt...in a nice safe non-flammable area. Even if it was worth trying to get a TIG in there, not sure I'd want to weld on a bolt in wood and fiberglass? Plus, it's stainless with a steel core (see broken drill bit above) .
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08-29-2009 12:40 AM
With an 8" wide stringer, rotate the mount and be done with it. That or tell your buddy to fix it himself or pay somebody.
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