1988-1992 Mercury Force 5HP Outboards Service Manual, Page 191Get this manual
EREASSEMBLING WATER PUMP NOTE: If water pump kit is used, proceed to step 21Install shift rod seal in water pump with metal capped end upT-8957
NOTE: Top of seal must be flush to 0.010 in(0.25 mm) below chamfer in seal bore Use seal installer (Special Tool NoT-895?)