Are all alternator pulleys the same size?
Alternator shaft sizes are not all identical so a pulley from one alternator may not be interchangeable with a pulley from another. These pulleys are also available separately for purchase , typically the cost is $60-100.
Can you replace an alternator pulley without replacing the alternator?
In many cases it is possible to remove and install the overrunning alternator pulley while the alternator is still on the engine. The plastic protective cap cannot be re-used after it has been removed from the pulley. A replacement cap is supplied with the new part.
What tools do you need to take off an alternator?
What tools are needed to replace an alternator
- Socket and ratchet set.
- Wrench set.
- Belt tensioner tool.
- Safety gear.
- Memory saver, if needed.
- New alternator.
Why do some alternators have a clutch pulley?
As opposed to traditional solid pulleys, they allow the alternator to “free-wheel” or “overrun” every time the engine decelerates and, at the same time, dampen vibrations at the alternator. They come in two types: one-way clutches (OWCs) and overrunning alternator decouplers (OADs).
What happens if you put a smaller pulley on an alternator?
Using a smaller pulley will speed the rotor up, and the alternator will produce more power.
How do you measure an alternator pulley?
Place your pulley face down on a flat surface, then put your ruler or caliper on top, measure from outside edge to outside edge across the circle of the pulley. Check carefully to make sure you are measuring across the center.
How long does it take to change an alternator pulley?
Depending on your vehicle’s make and model, a seasoned professional mechanic should be able to replace your alternator in about 2 hours.
What is an alternator overrun pulley?
The overrunning alternator pulley is a further development of the fixed belt pulley on the alternator. Thanks to its overrunning clutch, it damps the vibrations which are generated by cyclic irregularities in the crankshaft and also enables the engine speed to be reduced rapidly in the event of sudden load changes.
Does the alternator turn faster or slower than the crankshaft?
The alternator pulley typically spins about two or three times faster than the crankshaft pulley to produce the power necessary at lower engine speeds, such as at idle.
What tools are needed to replace an alternator?
In addition to a replacement alternator, you’ll need some tools:
- Hand tools like ratchets, sockets, and wrenches.
- Belt tensioner tool.
- Gloves and safety gear.
- Battery tender or memory saver, if necessary.
- Jack, jack stands, and wheel chocks, if necessary.