SOHC.co.uk Forums > CB500/550

Cylinder block stuck

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Paull:
I had this trouble with my 550. the studs are tappered and get a load of crap down the holes then the thicker screw tread will not go through the hole I cut the tread of the studs then the thin bit went through the hole and of it came. The down side to this is, you have to get new studs and they don't make them. All they are are is a bit of steel with an 8mm tread on each end. Simple to do.
Paul

K2-K6:
The studs are usually made like that so the solid core has the same dimension along the entire length of the stud to ensure an even loading when stretched under torque. The threads are bigger as they are an addition to the core diameter and don't contribute much to the designed load spec.

They are made like this to get the max load vs wheight / space balance to best performance.

You often get gear shafts with this same basic pattern as well, for the same reasons.

s7paul:
Thanks for all the suggestions.  Just to close this off, I tried all the usual stuff - big screwdrivers, hide mallet, etc., and there were no other bolts holding it down that I hadn't already removed.  Eventually I used a steel wedge, which I managed to tap into the joint such that it was actually splitting the gasket material (rather than bearing directly onto the metal).  A few careful taps each side and it finally started to move.  I didn't like having to resort to such methods but there's no damage, so it looks like I've got away with it.

Spitfire:
Good to hear a "happy" ending, I forgot to mention that my head and barrels were stuck together by a rusty dowel !

Chers

Den

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