Can anyone tell me what would break a locating pin/lug on the timming/flywheel side main bearing? seems that mine has been damaged, broken and as such killed a bearing and scorred the crank cases, Ive looked at the workshop pic and looked at the parts diagram, but can see how it would have broken., surley once in and tightened up the lugs have done there job its now down to the cases being together and holding it all in place?

I pulled this from the installation of a crank so you can read for your self, I can understand why it would break.

"Pre-fit the crank to align the seals and bearings. You will notice the seal on the flywheel side has lugs to help locate it in the cases, and the clutch side has a lip around its' entire edge, and neither actually sit flush to the bearings. The bearings have locating pins to help prevent them spinning in the cases and align correctly. Pre-fitting the crank will ensure that it can be fitted with minimum time and fuss once the new sealer has been applied to the cases."

Any techies out there give it your best shot! very intrested to know HOW a lug can break off ????

Could a previous spun ring break and sieze have caused it?