Mercury Mariner 8/9.9HP 4-Stroke Factory Service Manual, Page 181Get this manual

Mercury Mariner 8/9.9HP 4-Stroke Factory Service Manual, Page 181

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Gear Housing Specifications Special Tools Required For Disassembly And Reassembly

NOTE: Before filling gear case, apply 10-15 PSI of air pressure at the VENT holePressure should not drop