Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 256Get this manual
7Tighlen nullo 50 lbin(5.6 Nm) This seats forward gear against the forward Ihrust bearing and tends to hold the propeller shaft from moving when measuring backlash 10Position dial indicator pointer on line marked Backlash Indicator Tool (91-53459)
a Propeller Shalt Load Washer Forward Gear Assembly Bearing Adaptor Bearing Carrier Tab Washer Cover Nul PVC Pipe inx in(127mm 50.8mm) Flat Washer (Prop Thrust Washer) Nut Shim Prop Tab Washer
NOTE: Bearirfg Preload Tool (9114311A2) should still be installed from having previously been used to determine pinion gear depth and reverse gear backlashIf it is not still PINION installed on gear case, refer to GEAR DEPTH ," previously, for proper installation procedure8With the proper preload applied to the propeller shaft and the drive shaft, rotate the drive shaft clockwise to 10 complete revolutions to seat forward gear and upper drive shaft bearings9II not previously installed: Secure threaded rod (obtain locally) to gear case with nuts and washersInstall: Backlash Indicator Tool (9 1-53459) Dial Indicator Holder (91-89897) Dial Indicator (91-58222A 1)