Mercury Mariner Outboard 40/50/55/60 2-stroke Service Manual, Page 172Get this manual
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Special Tools 1 Lifting Eye 91-90455
4 Powerhead Stand 91-25821A1 11 Piston Lock Ring Installer 91-77109A3
12 Torque Wrench (0-200 lbft Obtain Locally 5 Piston Ring Expander 91-2469