Durango 2WD V8-4.7L VIN N (2001)
Starter Motor: Description and Operation
The starter motors used for this engine are not interchangeable with the starter motors used for the other available engines for this model.
This engine starter motor is mounted with two bolts to the transmission housing on the left side of the engine.
The electric motors of both starters have four brushes contacting the motor commutator. The starter motors use four electromagnetic field coils wound
around four pole shoes. The starter motors are rated at 1.4 kilowatts (about 1.9 horsepower) output at 12 volts.
The starter motors are serviced only as a unit with starter solenoids, and cannot be repaired. If either component is faulty or damaged, the entire starter
motor and starter solenoid unit must be replaced.
The starter motor is equipped with a gear reduction (intermediate transmission) system. The gear reduction system consists of a gear that is integral to the
output end of the electric motor armature shaft that is in continual engagement with a larger gear that is splined to the input end of the starter pinion gear
shaft. This feature makes it possible to reduce the dimensions of the starter. At the same time, it allows higher armature rotational speed, and delivers
increased torque through the starter pinion gear to the starter ring gear.
The starter motor is activated by an integral heavy duty starter solenoid switch mounted to the overrunning clutch housing. This electromechanical switch
connects and disconnects the feed of battery voltage to the starter motor, and actuates a shift fork that engages and disengages the starter pinion gear with
the starter ring gear.
The starter motor uses an overrunning clutch and starter pinion gear unit to engage and drive the gears on the flywheel (or flywheel ring gear).
