STERN DRIVE MECHANICS
The engine transmits rotational energy to the drive shaft at the
engine coupler. Once engine output energy is transferred to the drive
shaft, it undergoes a ratio change determined by the gear case. This
converts the revolutions of your engine to applicable rotations of the
propeller. From here, the propeller shaft turns in accordance with the
energy ratio determined by the gear case, and rotates the propeller
shaft. Your drive hub and other prop hardware keeps the propeller
in contact with the prop shaft allowing the propeller to spin without
coming off the shaft.
The stern drive uses water pickup feeds normally found on the port
and starboard face of the stern drive. These holes allow raw water
to be drawn up into the stern drive and pass through the transom to
the engine where it can be used as coolant. Used water as regulated
by the thermostat is transferred back to the stern drive and emitted at
a vent above the propeller, or through the prop shaft, depending on
the engine and drive manufacturer. Refer to your stern drive owner’s
manual for details on the location and operation of the components.
3-19
Engine & Controls
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