What are the main reasons for starter motor freewheeling?

1 Answers
WyattAnn
07/25/25 7:30am
Automotive starter motor freewheeling occurs due to the following reasons: 1. Faulty solenoid switch: Common solenoid switch failures typically involve short circuits, open circuits, or grounding issues in the pull-in and hold-in coils, as well as burnt contact discs and terminals. Coil continuity and grounding can be checked using an ohmmeter to measure resistance. 2. One-way clutch slippage: The primary component of the drive mechanism is the one-way clutch, which transmits torque unidirectionally - exclusively transferring torque from the starter to the engine flywheel. This prevents the flywheel from overspeeding and damaging the starter motor after engine ignition.
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