Mercury Mariner Outboards 2.2 / 2.5 / 3.0 Service Shop Manual, Page 62Get this manual
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Reassembly Propeller Shaft Bearing Installation
3 in .0: Threaded Rod Nut Metal Plate (91-29310) Bearing (Numbered Side "Up"in .0 3 in 1.0: Mandrel (or Washer) 3 in= 9.5mm in25.4mm