Auto Repair Encyclopedia
Starter Replacement
Sometimes referred to as Starter, Replace Starter, Starter Replace
By harnessing the power of the battery, the starter motor powers the engine to "turn over" and start when the driver turns the ignition switch. The starter motor also enables the driver to restart the engine once it has been switched off.
When the starter motor causes the engine to revolve at about 350–450 rpm, the engine develops enough vacuum to enable combustion to occur, which is what causes the engine to start. Once the engine starts, the driver releases the ignition key from the start position, allowing the starter to disengage.
If you only hear a "click" when trying to start a vehicle, it may be a sign of a low battery, a loose battery connection, or a failed starter solenoid.
The starter motor is located where the engine and transmission join together.
When replacing the starter, the technician first disconnects the battery and then removes the electrical wiring and hardware securing the starter. The defective starter is removed and a new one is installed. Replacement can vary from easy and straightforward to time-consuming and difficult.
Mechanics' Corner: More Technical Detail
The starter is a powerful, electric DC motor that rotates the crankshaft 350–450 rpm to begin the starting process of the engine. The starter motor has a special gear that engages the flywheel, which is connected to the crankshaft (frequently located between the transmission and the engine). Usually the engine needs to rotate 720 degrees (two full rotations) in order for the computer sensors to register the correct crankshaft and camshaft positions. This enables the delivery of fuel and spark at the proper time for the engine to "fire" or begin to run.
About this Repair: Starter Replacement
What to watch out for
Many vehicles have a special ignition key that is electronically coded to start your vehicle, if this key or the system is having problems, the symptom may be the same as a faulty starter.
Why this happens
If the battery cables are found to be corroded, they will need to be cleaned and possibly replaced along with the starter.
Corroded and/or loose battery terminals can exhibit the same symptoms as a faulty starter.
For vehicles with an automatic transmission, ask to have the neutral safety switch inspected and manual transmission vehicles should have the clutch pedal switch checked. A bad switch will have the same symptoms as a defective starter.
If only a "click" is heard when trying to start the vehicle, the battery may be low, battery connections may be dirty or loose, or the starter solenoid may have failed. The entire starting and charging system should be inspected before replacing the starter.
