That sounds like a standard-diameter bearing running against an undersize crankshaft. Did you measure the crank and then plastigauge the assembly as it went together? It sounds you need to reevaluate the capabilities of your mentor if he missed something that obvious.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!