Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 376Get this manual
3Slide the rubber sleeve at top end of shift shaft down so that it just touches the oil seal in the bushing Drive Shaft and Pinion Gear
INSTALLATION 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 replaced, start off by installing 0.038 in(0.96 mm) shim(s)
NOTE: If the original shims were retained (or measurement known) and none of the above listed parts were replaced, reinstall the same shims or same amount of shims
1Place the shim(s) into the drive shaft housing bore70492
a Shift Shaft Rubber Sleeve Oil Seal Shift Shaft Bushing Speedometer Connector
NOTE: Secure the speedometer tube to the speedometer connector with sta-strap