SOHC.co.uk Forums > CB350/400

I think I've done something wrong!

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Bryanj:
If it stopped suddenly and will not turn over possibly cam chain broken or something fell off internaly and jammed the cam/crank

DO NOT rotate the enging with the big nut on the advancer unless plugs are out, also do not rotate the crank till you have sorted what happened or you may bend valve(s)
Remove cam cover and inspect, my personal ideas would be cam sprocket bolt fell out or cam chain snapped

SeanFD:
Cam sprocket bolt came out, somehow dislodged the left rear dowel, which got jammed between the chain and body.

This is where the dowel ended up:
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This is where the bolt ended up:
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And this is what they looked like:
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The only other damage I can see is this:
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So it looks as of I might have escaped lightly. The one question I have now is what has happened to the rest of the dowel. if this has dropped down teh cam chain tunnel, will it be safe to run the engine? Is there anywhere else it could have gone?

There is what looks like a large washer - can't think of another way to describe this - on the camshaft sprocket, which is held to the sprocket by the bolts. it looks as if it has been bent but I cannot find it on the parts fiche. will it be OK to simply put this back in place and bolt it back to the sprocket? To replace it would require removing the camshaft.

Nurse Julie:
I can see how the bolt came out if you didn't put locktite on it but I can't fathom out how the dowel got involved in the failure 🤔🤔🤔

Nurse Julie:
If you mean the big wide disc shown in my photo, it doesn't show on the fiché but they were fitted to the late F2 models, earlier models didn't have them. You appear to have a lot of scoring on the camshaft.

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SeanFD:
Yes, I saw that on the photo also, although I didn't notice it on the shaft itself. I'll have a look at it in the morning. I'm (almost) sure I put lactate on the bolt, but maybe not.

And the dowel puzzled me too. I'm assuming that is what it is because it is missing  :-\

I was referring to the disc. If it is not on the fiche, how can I order a new one, assuming it is available?

So is it OK to turn over the engine now to see if the remains of the dowel have fallen through, or are lodged somewhere?

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