The plunger or lever is the device that pushes the starter pinion gear into mesh with the ring gear when the ignition switch is in the start position.
The pinion is a special gear and spring assembly. The gear is extended into the gearbox case and engaged with the flywheel after the starter is turned on. In order to start the combustion process, the engine spins.
Before turning to start the engine, the pinion engages with the ring gear. A free wheel clutch prevents the pre-engaged starter motor from overspeeding when the engine accelerates.
Therefore, the plunger or lever is the device that pushes the starter pinion gear into mesh with the ring gear when the ignition switch is in the start position.
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