See full version: How does a starter motor disengage
Likewise, does a starter motor turn the flywheel? At the same time, the starter solenoid pushes the starter gear forward to mesh it with the engine flywheel (flexplate in an automatic transmission). The flywheel is attached to the engine crankshaft. The starter motor spins, turning over the engine crankshaft allowing the engine to start. more
The starter circuit is typically quite simple. The high current wire goes from the battery to the starter motor. The ignition sends a signal to a relay so it closes and allows current to flow to the starter solenoid. Since you've already replaced your starter and the ignition switch, you have one likely problem left.
Correspondingly, what causes a starter to stay engaged?
You want to make sure that the power does not stay on once your ignition switch is released. This continuous power to the starter can cause it not to disengage. To make sure it's not the solenoid; check the power on the posts behind the solenoid by testing the wire coming from the ignition switch, using a voltmeter. more
Sometimes the starter gear for some reason won't mesh properly with the engine flywheel. This may cause a very loud metal grinding or screeching sound when attempting to start the car. In this case, the flywheel ring gear needs to be checked for damaged teeth. [links]
The starter motor is powered by the car's main 12-volt battery. To turn over the engine, the starter motor requires high electric current, which means the battery has to have sufficient power. If the battery is discharged, the lights in a car might work, but it won't be enough power (current) to turn over the starter motor.
Another part that often fails is the starter motor itself. Sometimes the carbon brushes or some other parts inside the starter motor wear out and the starter motor stops working. here
In most cars, the starter motor is bolted to the engine or transmission, check these photos: photo 1, photo 2. See how the starter motor works inside below.
The battery is very common to fail. Sometimes one of the electrical components that was left on or has a defect causing parasitic current draw drains the battery. Sometimes, an old battery can just die one day, with no warning. In either case, if the battery is low on charge, it won't have enough power for the starter motor to turn over the engine. more
If the distance between the two centerlines is too large the contact spot between the two gears will be much higher on the face of the tooth than it was designed to be. The net effect is that it puts the gear tooth at a mechanical disadvantage and will be much more likely to break the tooth. If the distance is correct, the pinion tooth face will swing into the opening and contact the ring gear about at the midpoint and exit without touching on the back side.” [links]
You can have the fastest or the most consistent car on the property at an event, but if you can’t get it to start when it’s time to race, all that performance potential won’t do you a bit of good. A round loss when it counts at the hands of a failing starter can be avoided by making sure it’s set up right when you first bolt it to your engine.
“The idea of proper clearances when setting up your starter pinion in relation to your flywheel or flexplate ring gear will help to ensure a long life for the gear set, as well. If the distance between the two centerlines is too close the surfaces of the gears will have a ton of pressure against each other, creating lots of extra friction and noise. Over time this will cause severe wear on the gears. here
The engagement between a starter and a flexplate or flywheel is critical if you want your engine to start without any issues each time you hit the ignition switch. Making sure your starter is engaged correctly with the engine is something that can easily be forgotten about, and it will prevent failure and premature wear on the unit. If you have the gear on the starter lashed correctly you should be able to grab it with pliers and remove it without any issues. If that lash is too tight it will put extra load on the teeth, and if the lash is loose it can cause the gear to hang up in the ring gear when the engine has started.
Besides the clearance of the starter pinion, you need to take into account the distance the pinion must move before it enters the ring gear. Not taking the time to make sure these measurements are correct can also lead to starting problems for your engine. more
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