Car Components Ignition Systems 

Checking and replacing the starter motor

An inertia-type starter motor is fitted with a Bendix gear on the shaft from the armature. When the started switch is turned on, the motor rotates rapidly, the shaft turns, and the Bendix gear screws the pinion along a thread until it engages with they flywheel ring gear on the engine. A pre-engaged starter motor Note the leadconnections Solenoid Activating lever Shaft Pinion Field coil Armature Commutator Brushes A pre-engaged type of starter motor incorporates a solenoid. When the started switch is turned on, the solenoid activates a lever which…

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Car Components Ignition Systems 

Checking the dwell angle

Points that have been in use for some time develop a peak on one face that corresponds with a crater on the other, caused by spark erosion as the points open. When this happens, a feeler gauge no longer gives an accurate measurement of the gap. A dwell meter measures the angle of rotation of the cam through which the points are opened and closed, and registers the dwell angle – the period when they are closed. It can therefore be used to check the gap on worn points with…

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a-pre-engaged-starter-motor Car Components Ignition Systems 

How to Check and replac the starter motor

If the test starter circuit indicates a starter motor fault, disconnect the battery and remove the engine from the car – complete the connection solenoid valve. An electro-magnetic device is used for some unit operations. An iron core is placed in a coil. When the power is applied to the coil, the coil and the core are moved, so that it can exert a force connection on anything. If it is a pre-engaged type of motor. To track faults for repairs, you almost always have to disassemble the motor, especially…

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