SOHC.co.uk Forums > CB350/400

Sheared bolt in the clutch pressure plate

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Drew400:
Yes indeed, folks. There I am 'tightening fully' (as instructed by Haynes) the four bolts that compress the springs/square plate of the clutch when, snap, one shears off. Oh joy, I say to myself as I briefly contemplate trying to run it with three bolts in place (soon dismissed that lazy notion).

I had already checked to see if there was a torque setting for these bolts when coming across the 'tighten fully' instruction. That instruction says to me, keep going until it stops turning... not a question of trying to then over-tighten it against the stop. No, this bolt snapped before I had to put any real pressure on it with a wrench.

I'm sure that I can source a new pressure plate fairly easily, probably more easily that trying to drill out the bit that's still in there. More importantly, do you have any tips for the torque that should be applied? Is there any danger from under-tightening (which will now be my preferred default approach)?

Thank you,

D.

LesterPiglet:
I normally just tighten until they seat then a tiny nip-up.

Drew400:
Thanks Lester,

That's what I though I was doing. Maybe there was a weakness in the bolt.

Cheers, D.

RGP750:
Quick tip that may get the broken part out.
Drilll about a 2.5mm hole in the centre of the broken part and tap
in a torx bit that is a tight fit, and use a socket on the torx.
 ;)

Drew400:
Nice one RGP... and now I know what those strange little screwdriver bit things are called!

Cheers, D.

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