Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 446Get this manual
Pinion Gear Location CHECKING Pinion Gear Location Specification: .025 in(0.64 mm)
3Rotate the drive shaft 120 degrees in clockwise direction and take another reading4Repeat this process until readings have been taken5Add the three readings together and divide the sum by to get the average pinion gear height6AIf the (average) pinion gear location does not meet the specification of 0.025 in(0.64 mm) continue with the instructions on the following section
1Place the pinion gear shimming tool into the gear housingNOTE: Take the following measurements at locations, rotating the drive shaft 120 degrees between each reading (always rotate the drive shaft in clockwise direction)