Starter: Electric motor that starts the movement when the car stars. The ignition key activates it.
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The starter engine creates the first combustion engine spins until it starts and keeps on working by itself. It is like it "pushes" the main engine. As soon as the combustion engine starts, the starter engine is deattached and it is out of service until someone starts the car again.
Starter motor will not ingage when looking under the bonnet when ignition is turned to start you can see the Belts turn a fraction but engine will not turn over