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Old 03-05-2002, 10:33 PM
hedpe's Avatar
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help fixing a bolt/nut

Hey all, I have a W126...an 89 300SEL to be exact. On the passenger seat, if you lift up the plastic flaps that cover the screws that hold the base of the seat to the car, i broke the nut that was welded on underneath the car from tightening it too hard I suppose, with a screw that I thought fit nicely. But at any rate, it broke off and now the screw spins and spins and spins and it never stops. I've tried pulling up and turning, nothing works. I could cut the screw but then the bolt with the other half of the screw would fall and sit inbetween the floor of the car and the bottom panel of the car and rattle and rattle, which would be fine with me, if someone can tell me how to get underneath there. There is a panel under there which is blocking access to the broken nut. Anyone know? Because I need to put another nut there and re-fasten it. I'd really appreciate any feedback or suggestions. Thanks!

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Old 03-06-2002, 09:45 AM
moedip
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still struggling with the bolt?? When you get real desparate - cut it off - let it fall down. If you are worried about rattles - get a container of home insulating expanding foam and shoot it into the bolt hole - it will encapsulate the screw bottom and it won't rattle.
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Old 03-06-2002, 01:07 PM
hedpe's Avatar
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but

Yeah it sucks, I might take it in to the Mercedes dealer. But I want to fasten another screw and nut in there after I get the other one out.
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Old 03-06-2002, 01:24 PM
moedip
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First thing - get it out or cut it and let the bottom half fall in. Push it out of the way with a piece of wire and try threading in a new one.Worst case scenario use a self tapping screw type bolt.
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Old 03-06-2002, 02:32 PM
hedpe's Avatar
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But if i cut it off and let the bottom fall, the nut that was welded will fall with it, if i stick a new screw in there, there is nothing for it to catch on and fasten to.
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Old 03-06-2002, 02:38 PM
moedip
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Then as I said in a previous response - look under the car and make sure the way is clear - then drill a hole right through to the bottom of the car and put in a bolt. Put a flat washer and a nut on the top part of the bolt to contact the floor above making sure enough threads go through to the bottom of the car. Then put a flat washer, lock washer and nut on at the bottom of the car and tighten it up. It will be stronger than ever. Simply get some roofing tar and tar the bottom of the bolt under the car to prevent water leakage and rust. - It really is simple.

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