2001-2002 Yamaha 50HP F50Z/T50Z Ouboard 4-stroke engines service manual, Page 266Get this manual
Backlash (T50FT50B, FT50C) Backlash indicator gaugeYB-06265 Backlash indicator90890-06706 Magnetic plate 0: YB-07003 Magnet base plate 0: 90890-07003 Dial gaugeYU-03097 Dial gauge set90890-01252 Magnet flexible standYU-34481 Magnet base90890-06705 5Slowly turn the drive shaft clockwise and counterclockwise and measure the backlash when the drive shaft stops in each directionNOTE: _ Tighten the propeller nut while turning the drive shaft until the drive shaft can no longer be turnedSlowly turn the drive shaft clockwise and counterclockwise and measure the backlash when the drive shaft stops in each direction
Forward gear backlash: 0.12-0.45 mm (0.005-0.018 in) 6Add or remove shims if out of specificationForward gear backlash Less than 0.12 mm (0.005 in) More than 0.45 mm (0.018 in) M: Measurement Available shim thicknesses: 0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and 0.50 mm 7Remove the special service tools from the propeller shaftApply load to the reverse gear by installing the propellerwithout the spacerand washer and washer as shownShim thickness To be decreased by (0.29M) 0.57 To be increased by (M0.29) 0.57