Mercury 40 Service Manual page 347

SLOW TILT DOWN UNDER HIGH
THRUST
To tilt the engine down under high thrust conditions
[where the propeller thrust forces the shock rod
down, creating higher pressure below the memory
piston (m)], the camshaft lever (f) is rotated slightly
downward. The internal shaft connected to the lever
will open the down slow transfer valve (i) allowing oil
under pressure into the cavity around the shaft. The
higher oil pressure will open the up fast transfer valve
(j) allowing oil from the bottom of the cylinder to flow
above the shock piston (n) while lowering the engine.
Additional oil will flow into the accumulator (c) as the
internal pressure forces the accumulator check valve
(e) to open. Oil flowing into the accumulator moves
the accumulator piston (d) and compresses the gas.
90-852572R1 JANUARY 1998 MID-SECTION - 5F-9