2001-2002 Yamaha 50HP F50Z/T50Z Ouboard 4-stroke engines service manual, Page 168Get this manual
IpOWRIIfriJ: IPower unit Checking the oil pump
1Measure the oil pump rotor clearances as shownReplace if out of specificationInstall the valvespring seatvalve springand spring retainer in the sequence shown, and then attach the special service tool862Y5580
Clearance0.09-0.15 mm (0.004-0.006 in) Clearance0.01-0.10 mm (0.0004-0.0039 in) Clearance0.03-0.08 mm (0.001-0.003 in)