Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 193Get this manual

Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 193

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GEAR HOUSING
1 To remove forward gear, strike open end of gear housing (a) on block of wood as shown, dislodging gear from bearingMake sure to retain shim(s) found behind gear for reassembly