1998-2006 Yamaha F20/F25 Outboards Service Manual, Page 227Get this manual
ILOWAI PROPELLER SHAFT HOUSING ASSY n '
2Install: Oil seals Oil seal position:13.013.5 mm (0.510.53 in) (6): 6.06.5 mm (0.240.26 in)
Driver rod CD: YB-0607190890-06606 Ball bearing attachment (oil seal installer)YB-0616890890-06637
3Install: Reverse gear Reverse gear shim(s) Ball bearing