2001-2002 Yamaha 50HP F50Z/T50Z Ouboard 4-stroke engines service manual, Page 262Get this manual
Shimming (FT50B, FT50C) (for worldwide) ShimmingNOTE:
Shimming is not required when assembling the original lower case and inner parts Shimming is required when assembling the original inner parts and new lower case Shimming is required when replacing the inner part(s)
Measure the distance (M) between the shimming tool and the pinion as shown
Selecting the pinion shims
1Install the drive shaft and drive shaft bearing CD to the shimming toolsS62Y6915
Measure the pinion at three points to find the clearance average
I Digital caliper90890-06704
Calculate the pinion shim thickness (T3) as shown in the examples below3