Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 299Get this manual
Drive Shaft and Pinion Gear INSTALLATION (FOR CHECKING GEA LOCATION ND BAC KLASHES ONLy) NOTE: If the original shims were not retained or if pinion gear, drive shaft, drive shaft tapered roller bearing and cup, or gear housing were replacedstart off by installing 0.038 in(0.96 mm) shim(s)Temporarily install the propeller shaft (without the sliding clutch installed) into reverse gear
6Insert the pinion nut adaptor (with the nut) into the gear housing It may be necessary to raise the drive shaft
slightly to clear the tool
7Start the pinion nut onto the drive shaft threads by rotating the drive shaft until the nut is snug
NOTE: If the original shims were retained (or measurement
known) and none of the above listed parts were replacedreinstall the original shims (or an amount of shims equal to the original shims) 1Place the shim(s) into the drive shaft housing bore at the location shown '
70891Pinion Gear (with the washer glued to it)Pinion Nut Adaptor (91-61067A3)Orive Shaft