How does the clutch on an alternator work?
How does the clutch on an alternator work?
An Overrunning Alternator Pulley (OAP) has a one-way clutch mechanism inside the hub that allows the belt to turn the alternator in one direction, but allows the alternator to free-wheel and spin at its own speed when the engine suddenly decelerates. Some replacement alternators come with pulleys and some do not.
Should an alternator spin freely?
It should turn quite easily but more important is it should be smooth. Very smooth. New bearings will sometimes feel a bit stiff and not turn freely because of the new seals and new grease that is in them. However that is ok as long as they are smooth.
What’s the difference between a clutch and an alternator pulley?
Clutched pulleys will have a cap while un-clutched pulleys typically will not. On the alternator above the end of the pulley is covered by a black cap, thus it is a clutched-type pulley. Outside of the possibility that the cap was removed and not replaced, this is a pretty reliable way to tell. How to test the alternator pulley.
How does the clutch work on a Mercedes Sprinter?
Mercedes clutches and other vehicles too, now have circular adjusting mechanisms built into the cover plate and spring that move to compensate as the clutch wears, maintaining the release spring pressure and finger position.
How to remove an alternator pulley on a VW?
http://www.denlorstools.com/home/dt1/… European style alternator pulleys (like Bosch alternators on VW, BMW and other makes) designed with a clutch built in, requires a specialty tool to remove and swap the pulley over to the replacement alternator.
How can you tell if your alternator pulley has failed?
Signs of a failed alternator pulley. Outside of physically testing the alternator there are some things to watch out for that can signal the alternator pulley has failed. First, if your serpentine belt tensioner has failed, it is likely that the alternator pulley is faulty as well. Typically the failed pulley is the cause of the tensioner failure.
What’s the difference between un-clutched and clutched alternator pulleys?
A 99% test is to look at the pulley and see if there is a black, plastic cap on the end. Clutched pulleys will have a cap while un-clutched pulleys typically will not. On the alternator above the end of the pulley is covered by a black cap, thus it is a clutched-type pulley.
Why is my Mercedes Benz alternator not working?
Basically a spring applies tension to a pulley which keeps the belt at the right tension. So I don’t think you’re having Alternator problems. I think your tensioner pulley bearing seized (age, km, or sometimes a dust/grease seal giving out and the bearing looses its lube) and the belt kept sliding on the pulley until it melted or destroyed itself.
How do you replace the alternator pulley on a VW?
Replacing the alternator pulley involves counter-holding the alternator shaft while loosening the pulley securing hut. This typically requires a special alternator pulley bit set which can vary between models. This Metalnerd Alternator Pulley Bit Set will cover all VW & Audi TDI models.
How does an alternator pulley work on a bike?
The bike is allowed to “free wheel” and continue down the road using momentum as you rest your feet. You can even push the pedals backwards without impacting your forward motion. The pedals will lock, however, if you start pedaling forward faster than the bike is traveling. The alternator pulley works the same way.
