SOHC.co.uk Forums > CB350/400

I think I've done something wrong!

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Bryanj:
Yes i have seen but not on 400, could be sprocket was not on shoulder properly

florence:
I see you described your process as 'I got one in and torqued and was doing the second when it stripped!'.  It is better to get both bolts in finger tight first and make sure everything is aligned before final tightening, equally, to full torque.  I thought I might mention this before you put in your new camshaft.  These castings are very strong in the directions they need to be but surprisingly brittle in other directions where force shouldn't be applied.

K2-K6:
Agree with likey cause being unintended force in wrong direction whilst tightening bolts unevenly, or missing alignment of sprocket throughout the assembley/ location part.

Good advice to get them all but fully assembled by fingers before just a tightening torque at end to finish the work.

Many years ago, watched someone tightening a jaguar XK camshaft (they are very long) by just going along from one end to the other in assembly, only to snap it in half as it bent against one of the valve springs.

Very strong in direction needed, but simply vulnerable to bending forces that are not part of running when in use.

SeanFD:
I did think about the possibility of the sprocket not being properly on as suggested by Bryan, and that may have been the case given the relative tightness as I put the bolts in - not overly tight, just not turntable by hand.

The first one was in snugly and I then put in the second and was torquing it when it stripped. Maybe an off-centre sprocket meant the bolt wasn’t lined up correctly so was cross-threaded.

The shaft broke after I had removed the sprocket bolts.

Good news is that I retrieved the missing part, sitting on top of the primary chains. :)
But not till I had already removed the sump …. And the exhaust to get at the bolts!  :(

The camshaft I had ordered turned out to be damaged, so now on the lookout for another.

Bryanj:
Only one on ebay at moment and thats in us and 100 postage!
I could get that reduced via a freind but not sure by how much, dont have any 400 ones about but try a wanted on the forum somebody may well have one, if you are very flush there are a couple of Yoshi ones on ebay at just north of a grand!

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