I have a new B&S 14.5 torque motor I transplanted on my 30" craftsman, I have made sure that everything is line up ok and the shaft lines up well with the pulley from the original motor, that was also a B&S snow engine. I noticed a small oil leak at the base of the crankcase - where it meets the block, anybody know if this is something that's common? on a new motor...? are there certain signs i can look at that I can check that may be a problem? any thoughts are appreciated. thanks!