1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 183Get this manual

POWERHEAD
cInstall upper locating washer

aLocating washer dSlide piston onto connecting rod, centering piston pin bore over sleeveeSlide piston tool up through piston pin bore and remove sleevefApply light oil to piston pin and place piston pin onto tool

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