1976 Johnson 2HP 2R76 Outboard Motor Service Manual, Page 46Get this manual
6- GEARCASE PRESSURE TEST To test gearcase sealing, proceed as follows: 1Remove drain plug and screw in pressure test gaugeSee Figure 6-13Stevens Experimental pressure test gauge illustrated
2Pump pressure up to 3-6 poundsGearcase must hold 3-6 poundsIf pressure gauge indicates leakage, submerge gearcase in water to determine source of leakage as evidenced by bubblesIf gearcase pressure gauge does not indicate leakage, increase pressure to 16-18 pounds Pressure should also hold at 16-18 poundsIf pressure does not hold, submerge gearcase in water and check for source of leakageMake necessary repairs and repeat testGearcase must hold within the range of 3-6 pounds and 16-18 pounds pressure
REASSEMBLY AND INSTALLATION OF EXHAUST HOUSING
aIf removed install vibration dampenersbInstall grommet and water tube in top end of housingSee Figure 6-12cAttach housing to swivel bracket and tighten clamp screws to torque specified in Section 2dUSing new gasket, install power headFigure 6- 13Gea cas Pressure Test
INSTALLATION OF GEARCASE