 Bumper Top stud replacement? |
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| Strudelwagon |
 Apr 29 2011, 10:27 AM
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#1
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Member  Group: Members Posts: 411 Joined: 11-October 08 From: interior, British Columbia Member No.: 9,633 Region Association: Canada  |
Has anyone had any success in replacing broken studs on a rubber bumper top??
any how to's out there? Thanks Steve |
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| underthetire |
Apr 29 2011, 12:33 PM
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#2
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914 Guru Group: Members Posts: 5,062 Joined: 7-October 08 From: Brentwood Member No.: 9,623 Region Association: Northern California |
Some people have them welded, but you would need a TIG. If the pad is not on a CW car, I drilled mine and use self tapping hex head screws. Works fine.
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| rick 918-S |
Apr 29 2011, 12:40 PM
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#3
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Hey nice rack! -Celette Group: Members Posts: 20,816 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region 
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Grind the stud flat, carefully center punch it, drill a hole through the metal piece, cut the head off a bolt, JB weld it into the hole or thread it in. But if you grind the shank on the bolt so there is a knotch to prevent it from being round the JB will hold it in the rubber plenty fine. BTW: I have done this.
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| Strudelwagon |
Apr 29 2011, 01:16 PM
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#4
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Member Group: Members Posts: 411 Joined: 11-October 08 From: interior, British Columbia Member No.: 9,633 Region Association: Canada |
QUOTE(underthetire @ Apr 29 2011, 11:33 AM)  Some people have them welded, but you would need a TIG. If the pad is not on a CW car, I drilled mine and use self tapping hex head screws. Works fine. Cool guys thanks |
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| Cheapsnake |
Apr 29 2011, 05:16 PM
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#5
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Member Group: Members Posts: 419 Joined: 15-November 07 From: Door County, WI Member No.: 8,341 |
I've replaced studs on tops where the steel reinforcing was rusted away to the point where there wasn't enough to weld to. Here's how:
Pull the remains of the old stud out and then drill a 3/4" hole into the rubber as deep as you can go without breaking through. Fill the hole with a hardening adhesive such as body putty and before it hardens, insert a 1/4" carraige bolt with a 3/8" flat washer welded to the head as far as it will go. Then before the Bondo hardens, pack the remaining hole with more body putty. Finally, cap it all off with another 3/8" washer and you'll find that it slips into a recess below the surface of the rubber. When it all hardens you'll have a very securely attached stud. Tom |
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| rfuerst911sc |
Apr 30 2011, 05:03 AM
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#6
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Advanced Member Group: Members Posts: 2,158 Joined: 4-May 06 From: Dahlonega , Georgia Member No.: 5,980 Region Association: South East States |
You can also use what is called a hanger bolt. This is a bolt that has machine threads on half of it and course screw threads on the other half. Drill out the rusted bolt and apply epoxy to the coarse threads. Double nut the machine thread side and screw the course side into the rubber. Let dry and good to go. These come in different length and diameter. Hardware stores and HD/Lowes carry these.
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| 76-914 |
Apr 30 2011, 07:20 AM
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#7
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,646 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California
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QUOTE(rfuerst911sc @ Apr 30 2011, 04:03 AM) You can also use what is called a hanger bolt. This is a bolt that has machine threads on half of it and course screw threads on the other half. Drill out the rusted bolt and apply epoxy to the coarse threads. Double nut the machine thread side and screw the course side into the rubber. Let dry and good to go. These come in different length and diameter. Hardware stores and HD/Lowes carry these. These are more readily available as "closet screws". They are used in place of "closet bolts" to anchor the toilet to a wooden floor and are brass. They come in both 1/4" & 5/16" SAE sizes and are brass. |
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