1990 Johnson Evinrude "ES" 60 thru 70 Service Manual, P/N 507873, Page 284Get this manual
COA2438
COA2439
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bQuickly clamp the piston tightly in soft-jaw vise Using breaker bar or similar tool through the eyelet, unscrew the rod from the pistonAllow the piston to cool before removing from the viseThe four valves in the tilt piston are not serviceableIf the valves need replacement, the entire piston assembly will have to be replaced Remove any Locktite material left in the threads of the piston and the rodcSlide the tilt cylinder end cap off of the rodRemove and discard the outside O-ring from the end capUsing flat tool, pry the outside scraper from the end capDiscard the scraper
COA2443
dUsing the same tool, pry the O-ring and back-up ing from the end cap Discard the O-ring eOil and install new O-ring and back-up ring in the end cap The square back-up ring goes above the 0ringf Use heat lamp or hot water to warm new scraperInstall the scraper in the end cap with the lip facing upgSecure the eyelet end of the rod in soft-jaw viseUsing OMC Tilt Cylinder Seal Protector PI 326005, slide the end cap onto the rod in the direction shownPlace new outside O-ring on the end caphSpray the threads of the rod and the internal threads of the piston with OMC Locquic PrimerIn soft-jaw vise, secure the piston firmly with the smaller valve holes facing UPApply one or two drops of OMC Nut Lock to the threads of the rodThread the rod into the piston Tighten the rod securelyTry to avoid allowing the piston to slip in the soft jaws of the viseOil and install new outside O-ring on the piston]