Mercury 45 Jet 50-55 Service Manual page 394

Under Water Strike With Valves Open
Should the drive unit strike a 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 passage. The 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 a static position by the closed up
fast transfer valve (j), the closed down slow transfer
valve (i) and down fast transfer valve (h). As the shock
rod extends outward, the pressure inside the up cav-
ity will reach sufficient pressure to open the shock
valve (p) which opens at 880-1110 psi. Oil will flow into
the cavity created as the shock rod & shock piston (a
& n) moves away from the memory piston (m).
90-817643R1 DECEMBER 1996 MID-SECTION - 5G-11