sounds like the ring gear or flywheel is worn if you have a manual or stick shift put it in 2nd gear depress clutch let car roll a little release clutch (the engine will turn slightly) then try starting engine. with auto transmission you will have to turn engine over with socket and ratchet bar (if you cant turn over at the drive belt by hand) if this starts your car the flywheel will need replacing... Could also be the bendix ... the solenoid that engages the starter motor to the flywheel.
With the flywheel spinning at about 1,000 RPM at idle, the starter, if engaged with the flywheel, would be forced to spin between 15,000 and 20,000 RPM. Once the engine has turned over and is running, the overrun clutch will release the starter from the flywheel and prevent the gears from re-meshing (as in an accidental turning of the ignition key) while the engine is running
As you did not say which vehicle this can only be a general answer Unlikely that a faulty coil would cause an engine to knock. Very possible it would cause bucking, if the coil is failing there would be a lack of spark. This would cause bucking/missfire, which may cause the engine to shake on it's mountings possibly causing a knock from contact with the vehicle frame.
This might help you a little bit,I have a 96 Cherokee that dose that, took it to shop still having problem your flywheel may be the problem you starter maybe in a dead spot on your flywheel(Missing a tooth)
if you have good battery and cable connections, the starter motor or starter relay is bad
No, a rusted harmonic balancer will not prevent the engine from turning over.
A bad flywheel can definitely cause the engine not to turn over. The flywheel has teeth. If the teeth are chipped or broken, then the starter can not engage to spin the engine over.
A flywheel is on the outside of the motor, typically has fins on it, it is weighted to keep the inertia of the motor spinning to help crank the motor over
To turn the engine over so that it will start. The starter engages cogs on the flywheel.
Using it too much or overloading it. Improvement, Using the engine too much will certainly not cause over heating. The most likely cause for the over heating is a clogged cooling shroud. Remove the top engine cover that surrounds the flywheel and remove the grass and debris. Mice love to make nests under those engine covers as well. Kevin
When and if the engine stops at the point where the starter gear is aligned with the missing teeth the starter will just spin and not start the engine. Over time even if the starter turns the engine over it will eventually ruin the starter. You need to replace the flywheel and the starter immediately.
The bellhousing is the part of the transmission that goes over the flywheel on the rear of the engine.
Rusted Iron that rusted over thousands of millions of years!
Pull the starter motor so you can see the flywheel. Make a chalk mark on the flywheel. Have someone turn the engine over by hand while you watch the flywheel turn one revolution. Look at the gear teeth and watch up in there for flexing and cracks and see that the bolts are all tight.
The starter turns the flywheel at the back of the engine. When the flywheel turns the whole engine turns. The timing chain is on the other end at the front of the engine. It is connected to the crankshaft and camshaft (s). So indirectly yes it does. If the whole engine is turned but the timing chain doesn't, there is a problem. Probably a broken timing chain.
sounds like the ring gear or flywheel is worn if you have a manual or stick shift put it in 2nd gear depress clutch let car roll a little release clutch (the engine will turn slightly) then try starting engine. with auto transmission you will have to turn engine over with socket and ratchet bar (if you cant turn over at the drive belt by hand) if this starts your car the flywheel will need replacing... Could also be the bendix ... the solenoid that engages the starter motor to the flywheel.
i believe the cause of this is a stripped starter gear, or the gears on your flywheel are shredded.