Engine Equipment
DETROIT DIESEL
WARNER MARINE GEAR
shift at low speeds, below 1000 engine rpm, to avoid
The Warner hydraulic marine gear assembly consists of
damage to the engine, reverse gear or shaft.
a hydraulically operated multiple disc clutch in
combination with a hydraulically) actuated reversing
The marine reverse and reduction gear is lubricated by
gear train, an oil pressure regulator, an oil sump
pressure and splash. The quantity of oil in the marine
independent of the engine oil system and an oil cooler
gear will vary with the inclination of the engine and must
mounted on the engine.
be properly maintained to the full mark on the dipstick to
ensure satisfactory operation.
Oil pressure for the operation of the marine gear is
provided by an oil pump incorporated within the gear
It is recommended that vessels utilizing a marine gear
housing and driven continuously while the engine is
have a suitable locking device or brake to prevent
running. The oil is delivered under pressure from the
rotation of the propeller shaft when the vessel is not
pump to a combination marine gear control valve and
under direct propulsion. If the marine gear is not in
pressure regulator valve.
operation and the forward motion of the vessel causes
the propeller shaft to rotate, lubricating oil will not be
The pressure regulator valve maintains constant
circulated through the gear because the oil pump is not
pressure over a wide speed range and the control valve
in operation. Overheating and damage to the marine
directs the oil under pressure to either the forward or
gear may result unless rotation of the propeller shaft is
reverse piston cylinder. The operating oil pressure
prevented.
range for the marine gear at operating speed is 120 to
140 psi and the maximum oil temperature is 225 F.
Consult an authorized Detroit Diesel Allison Service
Minimum oil pressure is 100 psi at idle speed (600 rpm).
Outlet for major repairs or reconditioning of the marine
Shifting from forward to reverse drive through neutral
gear.
may be made at any speed; however, it is advisable to
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