1988-1992 Mercury Force 5HP Outboards Service Manual, Page 211Get this manual
8 Inspect gear housing Measure inner diameter of front gear bearing
NOTE: If front gear bearing is not within tolerance, gear housing must be replaced Carefully check inside of bore for cracks, corrosion and burrsRemove burrsSuperficial corrosion may be permissible if not on sealing surfaceCracked housings must be replaced
EREASSEMBLING GEAR HOUSING