Mercury 40 Service Manual page 422

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
circuit slow transfer valve (i) allowing oil under pressure into the cavity around the shaft. The
higher oil pressure will open the up circuit 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 compres-
ses the gas.
a -
b -
c -
d -
e -
g -
h -
k -
m -
n -
o -
p -
90-828631R3 MARCH 1999
Shock Rod
End Cap
Accumulator
Accumulator Piston
Accumulator Check Valve
f - Camshaft Lever
Manifold
Down Circuit Fast Transfer Valve
i - Down Circuit Slow Transfer Valve
j - Up Circuit Fast Transfer Valve
Surge Valve
l - Cylinder
Memory Piston
Shock Piston
Shock Return Valve
Impact Relief Valve
MANUAL TILT ASSIST
Page 5D-9