1988-1992 Mercury Force 5HP Outboards Service Manual, Page 187Get this manual
5 Slide impeller (A) from driveshaftRemove
drive pin
NOTE: Be careful not to raise driveshaft too highPinion gear may fall out of position Lift driveshaft up just enough so that impeller drive pin (A) clears water passage (8) in water pump bodyPull out impeller pinRemove spring pin (A) securing gear shift rod to coupling