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Old 11-25-2011, 02:33 PM   #1
jlpp OP
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F800GS - stripped side rack mount point

What are the options for dealing with a stripped side rack mounting point thread as seen in the attached picture. When I put the bolt in it gets to a certain depth and runs up against the stripped threads and then the entire circular unpainted metal threaded hole starts to rotate. The fact that it rotates makes me wonder whether this circular threaded mounting point is meant to be replaceable. Never tapped (threaded?) a new hole before but I suspect the fact that this thing rotates will make it difficult. Any ideas on how to proceed?

Thanks a lot for your help.
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Old 11-25-2011, 02:34 PM   #2
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Closeup

Here's a closeup shot.
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Old 11-25-2011, 03:03 PM   #3
fastredbike
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this seems pretty common, these fasteners are replaceable. Your dealer can insert new ones or some people have done it themselves - there's a special tool you need. There's a big-box hardware store here called Princess Auto (the Canadian equivalent of Harbor Freight, I think) that sells a DIY bundle with various sizes of threaded inserts and the tool you need to switch them in and out. Harbor Freight may have it too.

good luck
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Old 11-25-2011, 03:40 PM   #4
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Looks like a rivnut to me. A common aircraft fastener. I dont favor them for that exact reason, when they get loose they spin. Replaceable, easy to install but they do require a special puller. http://en.m.wikipedia.org/wiki/Rivet_nut
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Old 11-25-2011, 03:40 PM   #5
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Originally Posted by fastredbike View Post
this seems pretty common, these fasteners are replaceable. Your dealer can insert new ones or some people have done it themselves - there's a special tool you need. There's a big-box hardware store here called Princess Auto (the Canadian equivalent of Harbor Freight, I think) that sells a DIY bundle with various sizes of threaded inserts and the tool you need to switch them in and out. Harbor Freight may have it too.

good luck
Thanks. Is this the tool you're referring to?
http://www.princessauto.com/workshop...stallation-kit
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Old 11-25-2011, 05:53 PM   #6
fastredbike
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Originally Posted by jlpp View Post
Thanks. Is this the tool you're referring to?
http://www.princessauto.com/workshop...stallation-kit
yes, that's the one I saw. I haven't used it and can't guarantee the size nuts you need are in the set. Maybe somebody else can vouch.
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Old 11-25-2011, 06:01 PM   #7
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Learned something new...

Here's the HFT one http://www.harborfreight.com/catalog...word=rivet+nut

You can always Helicoil it to get the right thread size.

Here's one write up on how to remove it but I'm not sure if it applies...http://www.tpub.com/content/tentsshe...-224-14_69.htm

The same site gives this as a repair...http://www.tpub.com/content/tentsshe...-224-14_70.htm
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Old 11-25-2011, 07:40 PM   #8
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Thanks all. I'll let you know how I end up fixing it.
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Old 11-28-2011, 08:02 PM   #9
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Thanks all. I'll let you know how I end up fixing it.
Well, got step one done: removing the old rivet nut (see photo). I had to use a Dremel and cutoff disc to grind it off as delicately as I could. I couldn't drill it out because the rivet would just spin freely, never allowing the drill bit to bite. Unfortuantely this put a few scars into the frame. This looks much worse in the photos. It's really just scratches in the powder coat/paint.

I went out to Harbor Freight to pick up a threaded insert riveter kit (http://www.harborfreight.com/45-piec...-kit-1210.html) but this only rivets sizes up to 1/4-20 (standard sizing) whereas the original rivet is for an M8 bolt (metric sizing) and I was concerned that the rivet wouldn't hold well enough in the larger frame hole.

Soooo, does anyone know if BMW has a named/numbered part to replace these rivet nuts? And maybe a tool?

Thanks,
Jeff
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jlpp screwed with this post 11-28-2011 at 08:22 PM
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Old 11-29-2011, 12:39 AM   #10
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Do a search on rivnut, another member had the same problem and had it fixed by his dealer, I think with an official tool.

Alternatively every machine shop should have a rivnut setting tool. Ask them to coat the outside of the nut and the hole with epoxy for some extra insurance against this happening again.
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Old 11-29-2011, 03:00 AM   #11
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i've set many of them without the "correct" tool.

screw a nut all the way on a long bolt of the correct size,
put a washer next to the nut,
screw the rivnut on the bolt
insert assembly in the hole,
hold the bolt with a wrench and tighten the nut,
this will expand the rivnut, when its tight remove the bolt


the riv nut works like a pop rivet, they're ok but don't over tighten anything in them because they will spin
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Old 11-29-2011, 07:08 AM   #12
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Quote:
Originally Posted by jlpp View Post
What are the options for dealing with a stripped side rack mounting point thread as seen in the attached picture. When I put the bolt in it gets to a certain depth and runs up against the stripped threads and then the entire circular unpainted metal threaded hole starts to rotate. The fact that it rotates makes me wonder whether this circular threaded mounting point is meant to be replaceable. Never tapped (threaded?) a new hole before but I suspect the fact that this thing rotates will make it difficult. Any ideas on how to proceed?

Thanks a lot for your help.
I wouldn't worry about the bolt holes, but I would REALLY worry about your brake fluid.
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Old 11-29-2011, 12:48 PM   #13
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Originally Posted by Kaw4Life View Post
I wouldn't worry about the bolt holes, but I would REALLY worry about your brake fluid.
Kinda looks like egg yoke...
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Old 11-29-2011, 05:58 PM   #14
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Originally Posted by Kaw4Life View Post
I wouldn't worry about the bolt holes, but I would REALLY worry about your brake fluid.
Uh oh. I had a 12k mile service at Bob's BMW a couple weeks ago. They would have checked the fluid then. Maybe the reservoir plastic is discolored. I'll check though. Thanks for the heads up.
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Old 12-01-2011, 05:23 PM   #15
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I had the same issue with mine this past summer. There's a thread here somewhere...

I chased the threads SLOWLY with a tap while holding the sides of the rivnut with a pair of vise grips on just tight enough to hold. I didn't want to collapse the rivnut.

It eventually chased right through after a few beer and some choice french canadian swear words.

I then threaded a nut and put a washer on a bolt, inserted the bolt as farw as it would go by hand. I then backed up the nut against the rivnut while pushing the bolt in. Once the washer touched the rivnut, I kept on going for 3/4 of a turn, and Voila! the rivnut was back in, and everything held on great for the rest of the summer.

Got the idea here...
http://fjr1300.info/howto/rivnut-tool.html
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