Author Topic: Gearbox battery carrier fixing  (Read 465 times)

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Offline Pallijen15

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Gearbox battery carrier fixing
« on: 21 Nov 2021 at 19:32 »
Hi, on my MKV the threaded holes which attach the battery carrier to the gearbox have been butchered. I want to put helicoil inserts in (1/4" BSF?). Would it be okay to do this with the gearbox in situ in the frame? Any help appreciated. Thanks,Paul J

Offline My 4th bike

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Re: Gearbox battery carrier fixing
« Reply #1 on: 21 Nov 2021 at 22:58 »
I don't see why not.
All I can add is use an insert at least twice the diameter (2.0D) or as long as possible.

Offline eddie

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Re: Gearbox battery carrier fixing
« Reply #2 on: 22 Nov 2021 at 07:43 »
Paul,
        Be careful if using inserts - the holes are blind and quite short, and it can be problematical installing the short inserts. If the bottom holes break through, you may generate another leak. On my bike, I just re-tapped the holes the next size up (5/16"BSF) and opened out the holes in the battery carrier to suit.

  Regards,
               Eddie.

Offline Pallijen15

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Re: Gearbox battery carrier fixing
« Reply #3 on: 23 Nov 2021 at 17:38 »
Okay thanks for replies. Are Keenserts and Timeserts any better? Don't really want to tap these out to a larger size, what about studs and high strength loctite? Thanks, Paul J

Offline My 4th bike

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Re: Gearbox battery carrier fixing
« Reply #4 on: 24 Nov 2021 at 21:43 »
I like coils if I have to use any.
You could watch this, It may help your decision.
“Thread Insert Deathmatch! Helicoil vs TimeSert vs key locking insert vs BigSert”
https://www.youtube.com/watch?v=LpDduCVUy6w
I support Eddie’s method, retap 5/16 BSF.
¼ BSF stud with thread locker, if there’s enough thread left for support it, could be your first try.

Offline Vitesse

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Re: Gearbox battery carrier fixing
« Reply #5 on: 25 Nov 2021 at 10:36 »
Save us all 32 minutes - what was the outcome and why?

Offline My 4th bike

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Re: Gearbox battery carrier fixing
« Reply #6 on: 25 Nov 2021 at 23:16 »
Coils win.
If you thought to watch there are short cuts included.
If you want to skip the intro and go straight to the good stuff...
The torque tests start at 5:20.
The pull out tests start at 13:02.
« Last Edit: 25 Nov 2021 at 23:24 by My 4th bike »

Offline Pallijen15

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Re: Gearbox battery carrier fixing
« Reply #7 on: 26 Nov 2021 at 16:16 »
Yes, good video that was. I've sorted it now anyway. One of the holes already had a metric helicoil insert in. But since it was only the  first two or three millimetres of the holes that were damaged I just fitted some longer bolts, there were enough good threads left. But I'll probably go for the helicoil kit if I need one in future. The video was very informative.
 Thanks, Paul J

Offline Vitesse

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Re: Gearbox battery carrier fixing
« Reply #8 on: 26 Nov 2021 at 21:14 »
Okay - worth thew half hour to watch!

Interesting that the steel bolt straight into the alloy was better in the pull out test than several of the inserts, though terrible at resisting over torquing. So, don't try to be clever and exceed the stated torque and the thing will hold!

 

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