Is there a clutch on an alternator?
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.
How do I know if my pulley clutch is bad?
Bad alternator clutch pulley symptoms The very first sign of a worn out overrunning alternator pulley is the excessive tensioner movement that is the main cause of this sound. A short chirping sound during the startup or shutdown of the engine is the first symptom of a bad alternator clutch pulley.
Can alternator lock up?
If the alternator locks up, it will usually snap or throw the drive belt. Bearing failure can also be caused by dirt or water contamination. Worn bearings can be replaced by disassembling the alternator and installing new bearings.
How to replace alternator on Jetta 1.9 TDI?
Volkswagen Jetta: hello I have a Volkswagen jetta 2003 1.9 hello I have a Volkswagen jetta 2003 1.9 tdi with 130,000 miles and I replace three turbos on it already, now when I pulled the old turbo out, I notice that the vacuum valve that goes to the turbo is … read more I. Silva High School or GED
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 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.
How does an alternator pulley on a diesel engine work?
The alternator pulley is also vital to absorbing crankshaft pulsations from hitting the alternator. As the crankshaft rotates it rapidly changes speeds for milliseconds at a time between combustion events at each cylinder. These pulses are especially strong on 4-cylinder diesel engines. The alternator pulley absorbs these split second pulsations.