Where is the one way pulley on an alternator?
First, as its name suggests, a pulley clutch is inside the alternator drive pulley. This is a one-way or overrunning clutch; your shop manual may describe it as an overrunning alternator pulley (OAP). This clutch locks up in the direction of normal alternator rotation so the drive pulley turns the rotor.
How can I tell if my car has a clutched alternator pulley?
How to determine if your car has a clutched alternator pulley. You might be asking how can I tell if the alternator pulley is clutched. 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.
What should I use to benchtest my alternator?
Alternator Benchtesting. OAP and OAD pulleys usually thread onto the alternator shaft whereas solid pulleys are typically a straight slip or press fit with a large bolt on the end of the alternator shaft to hold them in place. Some replacement alternators come with pulleys and some do not.
Can a bad pulley clutch cause no charge?
A failing alternator pulley clutch may trick technicians because its symptoms are so subtle and varied. After all, a bad pulley clutch could create problems ranging from a barely audible noise to a no-charge condition. These tips will ease diagnosis.
How to diagnose and replace alternator clutch pulleys?
Welcome to my new video. Today i ame going o show you how to diagnose and replace so called OAP (Overrunning alternator pulley). These pulleys are fitted in all modern cars so you can be sure that your car has one on its alternator. Pulleys shown in the video are the popular VW AUDI clutch pulleys.
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.
What happens when your serpentine belt pulley fails?
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.
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.