1984-1986 Mercury Force 4HP Outboards Service Manual, Page 67Get this manual
B Apply sealant (Special Tool NoT 8983) to threads of retainer screwsInstall screws and tightenInsert driveshaft in motor leg while turning propeller shaft or crankshaft until driveshaft splines engage crankshaft splines Figure 30
16Pressure test gear housingARemove fill plug Irom lower starboard side 01 gear housing
BThread adapter 01 pressure tester (Special Tool NoT 8950) Into drain hole of gear housing and
tighten securely
CAUTION
Seals may be damaged il pressure exceeds 10 p.s.iPressurize housing to 10 p.s.iand observe gauge lor live minutesIf pressure drops, immerse housing in water and repressurize (10 p.s.iReplace seals wherever air bubbles appear, then retest
Figure 30Instllillng Ge.r Housing