1976 Johnson 4HP 4R76, 4W76 Outboards Service Manual, Page 48Get this manual
WATER PUMP SERVICE STANDARD GEARCASE WATER PUMP aRemove two water pump screwsSee Figure 6-4While holding driveshaft down in gearcase, slide impeller housing cover and impeller housing cup off of driveshaftSee Figure 6-5
IMPELL ER KEY WAY
IMPELLER PLA TE IMP ELLER C
IMPELLER HOUSING COVER
GROMMET WATER PUMP ASS EMBLY
IMPELLER INSTALLATION
Figure 6-6Impeller in Impeller Housing Cup
WATER TUB=:-_ GROMMET IMPELLE HOUSING COVER-t IMPELLER SCREWS
I MPELLER63033
IMPELLE DRIVE KEY
Figure 6-4Water Pump Assembly (Standard Gearcase)
HOUSING CU SPACER