SOHC.co.uk Forums > CB350/400

stripped camshaft sprocket thread fix/workaround

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Dolomite_:
Getting the last bits on the engine ready to fire up on the weekend and somehow one of the cam shaft sprocket threads stripped when I was hand tightening it. Not sure how, I was just hand tightening both of them up equally.

To save me trying to find a new camshaft or tapping a new thread. How bad of an idea/fix would it be to just get a slightly longer bolt and use a nut to hold it in place? There is enough room on the other side for a nut.

Johnwebley:
I guess there are several methods

Simplist is what you thought,

But it makes it out of balance,

Or can you helicoil?

Or my solution, fill the hole with weld,drill,and tap,

A decent engineering shop could do that,

Let's face it, we don't want any loose bits flying around inside the motor



Sent from my SM-A546E using Tapatalk

Orcade-Ian:
Firstly,
Are you sure it's the hole in the camshaft and not the thread on the bolt?  As John says putting a nut on the end of a longer bolt would upset balance, although it's only running at half engine speed and not large diameter - so do both of them - you say there is room for a nut.  The cam flange at that point where the nut would seat is as forged and not really flat, so if was going that route I would use 'staytite' nuts, not nylocs.

Ian

Bryanj:
As the surface is not flat a nut would not be a good engineering fix, there should be plenty of used cams out there and at the present stage replacing it will not be much work

Dolomite_:
After my initial panic has settled, I think it actually is the bolt that stripped. What are the original bolts made of?

Hopefully, I can find a suitable bolt so I can get it up and running this weekend.

Out of interest, what are the camshafts made from?

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