Easy to follow guide describing how an automotive engine starter motor works,
this information pertains to most vehicles.
A starter motor is used to rotate an engine to begin the combustion process.
A flex plate or flywheel is connected (bolted) to the rear of the crankshaft, these
unit are fitted with a ring gear which enables the starter to be activated. If the
flywheel is worn it can cause a grinding noise when the starter is operated.
A starter is made up of two separate parts, the solenoid
which is used to activate the electric motor, and to push the starter bendix gear
into the ring gear. (Note: Some vehicles have the solenoid mounted on the fender
or near the battery.)