1991 Johnson/Evinrude EI 60 thru 70 outboards Service Manual, Page 318Get this manual
Routine Inspections f11 1Check reservoir fluid level at least once per season or every L!J 50 operating hoursSystem capacity is approximately 25 flo oz(740 ml) Unit must be in vertical position Check fluid when trim and tilt cylinders are fully extended Add OMC Power TrimTilt and Power Steering Fluid or GM Dexronas needed to bring level up to the bottom of fill plug thread Loosely install fill plug Cycle unit in ten second spurts (adding fluid as needed)A minimum of five complete cycles is required to purge air from the system
2Look for indications of internal fluid leakageCorrect the cause if leaks are noted