2001 Mercury Mariner 50-60HP Factory Service Manual, Page 374Get this manual
MANUAL TILT ASSIST
Under Water Strike (Valves Open)
Should the drive unit strike submerged object while in forward motion, the shock rod (a) will extend from the tilt cylinder (l)Fluid will attempt to exit the cylinder through the interconnecting passageThe rapid fluid flow will increase the pressure below the surge valve (k), causing the valve to move, closing the oil return passage back into the accumulator (c)Oil inside the up cavity is locked in static position by the closed surge valveAs the shock rod extends outward, the pressure inside the up cavity will reach sufficient pressure to open the shock valve (p) which opens at 880-1110 PSIOil will flow into the cavity created as the shock rodshock piston (an) moves away from the memory piston (m)