Mercury 40 Service Manual page 256

MANUAL TILT
To manually tilt the outboard engine, the owner will
need to back out the manual release valve (j). With
the valve backed out, the internal passages inside
the manifold are connected together. These pas-
sages connect both the cylinder down and up cavities
together, along with the reservoir (t), allowing the en-
gine to be raised or lowered. Trim ram (b) movement
will continue until the manual release valve is closed,
locking the fluid inside of the cylinder and manifold.
90-852572R1 JANUARY 1998 MID-SECTION - 5C-19