2001 Mercury Mariner 50-60HP Factory Service Manual, Page 452Get this manual

2001 Mercury Mariner 50-60HP Factory Service Manual, Page 452

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NON-BIGFOOT GEAR HOUSING
Gear Housing Pressure Test
1 Remove vent plug and install pressure test gaugeTighten securely
2 Pressurize housing to 10-12 PSI (69-83 kPa) and observe gauge