Tilt Up - Mercury 45 Jet 50-55 Service Manual

Tilt Up

In the "up" mode, as the piston rod (a) extends from
the cylinder (w), the memory piston (t) clears or un-
covers the pressure relief passage. Oil from the up
cavity will enter this passage and, if required, causes
the tilt relief piston (s) to open the tilt pressure relief
valve (r). This valve lowers the amount of pressure
available to lift the outboard motor. With the engine in
forward gear, and at high engine rpm, the oil pressure
available will not be able to overcome the propeller
thrust, limiting the trim range to below the pressure re-
lief orifice. When the engine rpm's fall or if engine is
not in forward gear, the oil pressure is available to ex-
tend the piston rod (a) up into the tilt range.
90-817643R1 DECEMBER 1996 MID-SECTION - 5E-9