What's "bearing pinch"?



Severe case of the crankcase halves rubbing against each other and over time
grinding away.
Thus the bore for that crank bearing is smaller. It keeps working ok for
a while because its a loosed fit. But if you retorque the thru bolts you'll
squeeze the bore back tighter and its smaller diameter will pinch the
bearing halves together, and maybe cause direct metal to metal contact
between the crank and bearing.

Many engines have dowel pins that fit the halves together to minimize
fretting.

Btw, I don't have the torque value bulletin handy but it seems tha the case
spine bolts are only torqued down to 7-10 ft lbs. Not that much but
definitely more than finger tight!

Kent Felkins