Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 151Get this manual
CYLINDER BLOCK AND CRANKCASE
12Remove piston assembly from the crankshaft
aConnecting RodCapBolt (2)Piston PinClip (2)Piston
13Press the crankshaft out of the cylinder blockaPressFlywheel NutThread Onto End of CrankshaftCrankshaftWasher