Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 379Get this manual
3Measure distance (a) and increase that distance by in(25.4mm) by turning bottom nut away from top nut Pinion Gear Location
CHECKING AND ADJUSTING Pinion Depth.025 in(0.64mm)
NOTE: If the bearing preload tool has not already been set up see "Drive ShaftBearing Preload Tool", 'Installation'section found on page 6A-42 firstNOTE: The prop shaft and forward gear can be installed when checking pinion height IF Pinion Height Tool 91-56048 is used
1Place the pinion gear shimming tool into the gear housing
NOTE: Take the following measurements at locations, rotating the drive shaft 120 degrees between each reading (always rotate the drive shaft in clockwise direction)aDistance in(25.4mm)Bottom nut [screwed down approximately in(25.4mm)]