Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 303Get this manual
Reverse Gear Backlash CHECKING
Install dial indicator as shown in the following figure
Reverse Gear Backlash Specification0.050-0.060 in
NOTE: If the bearing preload tool has not already been set up see ShaftBearing Preload Tool", 'lnstallalion' section found on page 6837 first
NOTE: The reverse gear bearing adaptor installation tool is used to apply light preload to the reverse gear in the following stepsInstall the reverse gear bearing adaptor installation tool into the gear housing to hold the reverse gear against the thrust bearing as follows:
aAssemble the reverse gear bearing adaptor installation tool into the gear housing and tighten it by hand until slight resistance is feltTorque the adaptor'S driver bolt to 45 lbin(5.1