1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 154Get this manual
6-11 POWER UNIT
INSPECTION
Oil seal Check oil seal lip for wear or other damageReplace as necessary
Oil pump components Check outer and inner rotors, rotor plate and oil pump case for excessive wear or damageReplace as necessary
MEASURING PUMP COMPONENTS
Radial clearance Using feeler gauge, measure radial clearance between outer rotor and caseRadial clearanceService limit0.31 mm (0.012 in If measurement is not within specifications, replace the outer rotor andor case