Why must the starter motor disengage from the flywheel after the engine starts?
To prevent damage to the starter and flywheel
To start the engine, the small pinion on the starter motor slides into mesh with the large ring gear on the flywheel and spins it fast enough to begin combustion.
The governing principle is the gear ratio between them: the flywheel ring gear has many more teeth than the pinion, so when the flywheel drives back, it turns the pinion many times faster.
Once the engine fires and runs on its own, the flywheel accelerates to normal engine speed — far higher than the low speed for which the starter motor is designed.
If the pinion stayed engaged, the flywheel would spin the starter armature at destructive over-speed, throwing the windings apart and stripping or shearing the meshing gear teeth.
To avoid this, an over-running (one-way) clutch and the solenoid throw the pinion out of mesh the instant the engine starts, protecting both the starter and the flywheel ring gear.
The other options are unrelated: disengagement is a mechanical-protection measure, not a way to extend battery life, improve fuel efficiency, or adjust ignition timing.
Hence, the answer is To prevent damage to the starter and flywheel.
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Important Questions from Starting System
In a diesel engine, the starter motor is a:
Which of the following term is not related to battery?
When starting the engine, the starter motor pinion engages with the _______.
_______ is a high-current relay (switch) used to connect the battery to the starting motor.
Which of the following switches is used in the starting system?
