11-42 DF140 “K2” (’02) MODEL
TILT SYSTEM PRESSURE RELIEF
(1) If engine speed exceeds approx. 1500 RPM when operating in shallow water drive mode, oil pressure will
increase underneath the tilt piston. The relief valve C (incorporated in the manual release valve K) will
then open.
(2) The oil below the tilt piston will then flow to the reservoir through the relief valve C.
(3) As the power of the engine continues to exert downward force on the tilt piston, this will open “Down”
check valve D, thereby allowing oil from the reservoir to flow into the chamber above the tilt piston.
(4) In this way, high internal pressure is relieved and the engine will slowly tilt downward until it reaches the
highest position in the Trim range.
THERMAL EXPANSION RELIEF
(1) High ambient temperature will, through thermal expansion, induce a build-up of oil pressure inside the
PTT unit.
(2) Expansion of the oil and the resulting high pressure will open the relief valve C, thereby providing unit
protection by directing oil back to the reservoir.
Expanded oil in the tilt cylinder upper chamber will return to reservoir passing through impact relief valve
I free piston check valve J thermal relief valve C.
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