Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 417Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 417

NON-BIGFOOT GEAR HOUSING
Gear Housing Pressure Test
1Remove vent plug and install pressure test gaugeTighten securely
2Pressurize housing to 10-12 psi (69-83 kPa) and observe gauge for minutes3Rotate drive shaft, prop shaft and move shift rod while housing is pressurized to check for leaks

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