2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 119Get this manual
Lower unit
Special service tools .6-1 Lower unit 6-4 Removing the lower unit 6-8 Removing the water pump and shift rod 6-9 Disassembling the oil seal housing 6-9 Checking the water pump and shift rod .6-9 Propeller shaft housing 6-10 Removing the propeller shaft housing assembly6-11 Disassembling the propeller shaft assembly .6-11 Disassembling the propeller shaft housing 6-11 Checking the propeller shaft housing 6-12 Checking the propeller shaft 6-12 Assembling the propeller shaft assembly 6-12 Assembling the propeller shaft housing.6-13 Drive shaft and lower case6-15 Removing the drive shaft.6-17 Disassembling the drive shaft 6-17 Disassembling the forward gear 6-17 Disassembling the lower case .6-17 Checking the pinion and forward gear.6-18 Checking the bearings6-18 Checking the drive shaft 6-18 Checking the lower case .6-18 Assembling the lower case 6-19 Assembling the forward gear6-19 Assembling the drive shaft 6-20 Installing the drive shaft.6-20 Installing the propeller shaft housing .6-20 Installing the water pump and shift rod6-21 Installing the lower unit 6-22 Shimming 6-25 Shimming.6-26 Selecting the pinion shims6-26 Selecting the forward gear shims 6-27 Backlash 6-28 Measuring the forward gear backlash .6-28