2004-2005 660 Yamaha Rhino Factory Service Manual, Page 204Get this manual
CRANKSHAFT AND OIL PUMP
REMOVING THE CRANKSHAFT 1Remove: crankshaft Use crankcase separating tool 1Crankcase separating tool PNYU-01135-A, 90890-01135
CHECKING THE OIL PUMP 1Check: rotor housing rotor cover Cracksweardamage Replace
2Measure: tip clearance (between the inner rotor rotor 2) side clearance (between the outer rotor housing 3) body clearance (between the outer rotor housing 3) Out of specification pump