Starter Motor: Description and Operation
DESCRIPTIONMotorcraft Positive Engagement Starter:
Motorcraft Positive Engagement Starter:
Positive Engagement Type
The starting system includes the starter motor with an integral Positive-Engagement Drive, the battery, a remote control starter switch (part of the ignition switch), the neutral start switch (used with automatic transmissions), the starter relay, starter interlock switch (used with manual transmissions except F-Super Duty Commercial Stripped Chassis with manual transmission), and heavy wiring circuit.
Exploded View Of Permanent Magnet Starter:
Permanent Magnet Type
The starting system includes the permanent magnet gear reduction starter motor with solenoid actuated drive, the battery, a remote control starter switch (part of the ignition switch), the park/neutral position switch (automatic transmission), clutch pedal position switch (manual transmission), the starter relay, and heavy circuit wiring.
OPERATION
When the starter is first connected to the battery, current flows through the grounded field coil, actuating a movable pole shoe. The pole shoe is attached to the starter drive plunger lever which forces the starter drive gear into engagement with the flywheel ring gear.
When the movable pole shoe is fully seated, it opens the field coil grounding contacts and the starter is then in normal operation. Normal field current is used to maintain the movable pole shoe in the fully seated position during the time that the starter is cranking the engine.