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Thread: Gearbox Ground Thread Stripped

  1. #1
    Registered User Manitou_Commando's Avatar
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    Gearbox Ground Thread Stripped

    The hole in the gearbox that receives the ground screw on my '88 R100 is now stripped. The bolt (23 11 1230599) as you may recall is aluminum as is the gearbox.
    Has anyone used a thread insert product to repair this hole and if so, which brand and size was used and with what degree of success?
    The repair will have to be undertaken and using a thread insert seems like the most cost effective and durable solution. Any thoughts?
    Rick

    It ain't what you don't know that gets you into trouble. It's what you know for sure that just ain't so. A. Lincoln

  2. #2
    Registered User lmo1131's Avatar
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    Rick, the use of that "vented" bolt ith the machined "grub" on the end, goes all the way back to 1969. My '73 R75/5 uses it. The one in my bike is definitely NOT aluminum. The one in my buddy's /6 is not aluminum, and I'd bet a dollar to a doughnut that the one that was in your R100 was not aluminum when it left the factory floor. If it is, someone has replaced it with an aluminum substitute. And considering that aluminum likes to gall onto itself might explain why your gearbox threads went away. That or the tendency most folks have of torquing the be-Jesus out of the bolt because it also secures the battery cable.

    (stainless replacement)



    That said, a "standard" metric Helicoil, Keensert, etc. should do the job. Installing it accurately, and making sure all the machining chips are out, without removing the rear cover might be another story.

    I'll pull mine out and check the thread size; pretty sure it's a 6m x 1.0
    "It is what you discover, after you know it all, that counts." _ John Wooden

    Lew Morris
    1973 R75/5 - original owner

  3. #3
    Watch This!!! junkjohn's Avatar
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    If you have to drill it, put a heavy grease on the drill bit to catch the shavings.
    John Simonds
    2008 R 1200 GSA
    1975 850 Norton Roadster
    If it ain"t broke... fix it till it is.

  4. #4
    Registered User PAS's Avatar
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    I would think that the gear box would have to be removed to get a perfect alignment for drilling. That bolt holds the speedo cable and drive gear in also.

  5. #5
    Administrator 20774's Avatar
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    Can you consider some kind of "fix" to hold the speedo cable and find a ground with a tranny bolt?
    Kurt -- Forum Administrator ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  6. #6
    Registered User PAS's Avatar
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    Always fixable, but how far do you want to go to do it right? Of course you can relocate the ground wire, no problem as long as the cable will reach and the bolt is long enough. You still have to deal with the breather bolt either way. My guess, this isnt the first time this has happened. I will do some investigating since I have never done this repair personally....yet!

    I keep asking if there is a spell check on here but havent found the answer to that either.

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    Yikes! This makes me wonder if it wouldn't be wise to obviate the situation and relocate the ground before this happens. These bikes are not getting any younger.

  8. #8
    Administrator 20774's Avatar
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    Quote Originally Posted by PAS View Post
    I keep asking if there is a spell check on here but havent found the answer to that either.
    When replying to a post, there's a green check with "ABC" above the posting area...that's the spell check. You may have to download a companion program for it to work.
    Kurt -- Forum Administrator ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  9. #9
    2011 R1200RT ka5ysy's Avatar
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    Thumbs up Grabit extractors : Dont leave home without them !

    Something everyone should have in their tool box is a set of Grabit extractors. These things are the best solution to extracting stripped bolts I have ever seen simply because they work with a drill in reverse, so do not torque the broken bolt tighter. Lowes has these sets usually in stock. Be sure you get the recommended size for the bolt or screw you are trying to extract. They have saved me grief a bunch of times when stuff broke off.

    http://www.thegrabitstore.com/Pages/howtouse.aspx

    Doug, 2011 R1200RT Polar Metallic
    MSF #127350 NAUI #36288

  10. #10
    Registered User PAS's Avatar
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    Quote Originally Posted by 20774 View Post
    When replying to a post, there's a green check with "ABC" above the posting area...that's the spell check. You may have to download a companion program for it to work.
    I will send you a private message........I just sent it twice but it's not showing up in my sent message box so I dont know if you will get them.
    Last edited by PAS; 02-21-2013 at 01:59 PM.

  11. #11
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    repaired mine years ago with a basic Heli-coil. Did not have to remove trans to get a good line on it, but it wouldn't be a bad option.
    Ride Safe, Ride Lots

  12. #12
    Registered User lmo1131's Avatar
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    Follow-up

    Threads pitch is 6M x 1.0

    KeenSert is a brand of thread repair product that I have used (not on my BMW). It worked well.

    "It is what you discover, after you know it all, that counts." _ John Wooden

    Lew Morris
    1973 R75/5 - original owner

  13. #13
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    Mine was stripped in the first year from new...all I every did was to remove the washer, which gave enough thread to tighten. 'Been that way since '76 with no problems.

  14. #14
    James.A
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    Quote Originally Posted by jforgo View Post
    Yikes! This makes me wonder if it wouldn't be wise to obviate the situation and relocate the ground before this happens. These bikes are not getting any younger.
    I have done this on every Airhead I've owned. This new-to-me R100RS I am working up will get the treatment the first time I have to pull that vented screw out of the transmission.

  15. #15
    Day Dreaming ... happy wanderer's Avatar
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    Quote Originally Posted by PAS View Post
    I keep asking if there is a spell check on here but havent found the answer to that either.
    Spell check is embedded in your browser nowadays.
    If you are using Firefox click on Tools, Options, Advanced and in the Browsing box check the "Check my spelling as I type" option. Incorrect spelling will be underlined with a red squiggly line as you go indicating an error you need to fix. VBulletin has no spell checker per se but instead relies on your browsers capabilities to do this.

    Explorer for example uses iespell or something like that. Worst browser ever though.
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

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