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Thread: Gearbox Ground Thread Stripped

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  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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