1994 Johnson/Evinrude "ER" 60 thru 70 outboards Service Manual, Page 268Get this manual
DRC3467
Impact Relief
1When the gearcase hits an underwater object and the engine tilts up, the tilt cylinder extendsThe fluid above the piston is compressed, producing high pressure2This high pressure fluid passes through the impact relief valves CD in the tilt piston, dissipating much of the energy of the impact3To return the engine to its original position, the hydraulic unit must be operated in the DOWN direction