Mercury Mariner Outboards 45 Jet 50 55 60 HP Models Service Manual, Page 433Get this manual
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Pinion Gear, Driveshaft and Forward Gear 1 Hold driveshaft using Driveshaft Holding Tool (a) (91-817070); remove (and discard) pinion nut (b)2 Remove driveshaft (c), pinion gear (d), and forward gear