SOHC.co.uk Forums > CB350/400
Snapped bolt, now what?
Athame57:
While undoing the bolts holding my front fender to the stanchion things got very stiff with the last bolt and....snap. ::) See it in the right hole in the image? It isn't even a standard arrangment, I had prchased new bolts for this but found someone down the line has drilled through, made a thread and sunk bolts that have a nut on the other side.
As you can see the two ends of the snapped bolt are within the the hole itself.
I can't do this on my own that's for sure, but I'll have to wait until friday now to go to the garage (pension day) ;)
MMMM....I hope they can fix this, what might I be in for? :-\
Skoti:
Probably needs to be drilled out.
Properly secured using a pillar drill and vice.
Correct alignment is essential to prevent the drill bit going off centre.
Maybe an M6 thread insert such as helicoil could then be fitted.
Or if you're lucky and it's possible to hold the broken stud with vice grips, then apply a wee bit heat and it might just come out.
Better to remove the fork slider and take it to your chosen repair shop or engineer friend.
Good luck
Skoti
Bryanj:
It will have to be drilled out, probably too far gone for helicoil but i bought some inserts from ebay 6mm inside 8mm outside
Athame57:
--- Quote from: Skoti on July 01, 2025, 12:31:10 PM ---
Or if you're lucky and it's possible to hold the broken stud with vice grips, then apply a wee bit heat and it might just come out.
--- End quote ---
Alas, there is no stud to get to grips with! ::)
exvalvesetdabbler:
A few heat cycles with penetrating fluid in between and then drill it the right size for a stud extractor. You might get lucky and it spins out when the drill bit bites.
If someone put it in with red locktite the heat should break it's grip.
If it can be drilled m6 then a helicoil should work.
Have used these at work on many occasions
https://voelkel.com/en/thread-repair-kits-6-x-1-0-1-5d/04073
Regards
Dave
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