I had this issue as well, i had a HUGE oil leak on the pass side. Looked like a river under there every couple hundred miles. When i was doing my T-Belt, pump cam and crank seals, the crank seal was at a 45 degree angle not sitting flush in the seat. But, before i press off the sprocket, i used a dial indicator on the sprocket, then depressed the clutch several times to see if there was alot of movement in the crank sprocket. It was in spec,i think .200 thousands of an inch just real small. But, if you have excessive crank walk, you need a set of thrust bearings i believe.