1991 Johnson/Evinrude EI 60 thru 70 outboards Service Manual, Page 288Get this manual
Manual ReleaseDOWN 1When the manual release valve is opened the motor is manually lowered toward the run position, fluid flows from the bottom of all cylinders, through the manual release valve to the top of the tilt cylinder2Fluid flows from the reservoir to the top of the trim cylinders3To allow for the volume differential caused by fluid from all cylinders flowing into the tilt cylinder, excess iuid vents to the reservoir through the manual release valve vent