Alternator pulley

The alternator pulley is attached to the drive belt or alternator belt. At the same time it is fixed to the alternator itself. When the engine is running, the drive belt helps to turn the pulley which in turn drives the alternator.

Commonly made from stamped steel or cast aluminum, an alternator pulley is either grooved for use with a V-type fan belt or designed with multiple grooves to be used with a serpentine-style drive belt, such as the single-drive belt found on late model vehicles. What is the purpose of the alternator pulley? How to replace an alternator belt?

How do you remove a nut from a car alternator? Clutch INA Quality. Overrunning alternator pulley function tests.

As opposed to traditional solid pulleys, they allow the alternator to “free-wheel” or “overrun” every time the engine decelerates an at the same time, dampen vibrations at the alternator. When these fail, it can cause the Auxiliary Tensioner to become noisy and fail. Skip to main content.

Whether you need a conventional solid pulley. Every time the engine decelerates - for example during gear changing or engine shutdown - the alternator’s inertia creates resistance against the belt. OAPs allow alternators to “free-wheel” or “overrun” when the belt suddenly slows down.

An overrunning alternator pulley (OAP) can play an important part in the smooth running of the modern internal combustion (IC) engine. But it often gets overlooked by design engineers despite the positive effects it can have on energy efficiency. The function of the OAP is to decouple the alternator from rotational irregularities. Generally, the alternator pulley is not the problem, it’s the pulley bearing. Most pulleys must be replaced when the bearings fail.

Bearings fail over time through normal wear and tear. Not only the easiest way but the only way to remove the centre pulley nut from your alternator. There may also be a nasty grinding or squealing noise coming from the Pulley itself. It is very common for a garage to change the Auxiliary Tensioner for it to fail again very quickly.

We use cookies to ensure you have the best experience on our site and to offer you personalised navigation and communications. That means the alternator rotates revolutions for every revolution of the balancer. On startup and acceleration, that causes issues for the belt drive. Did you know that some solid alternator pulleys have been replaced by a patented pulley technology that is an important part of the drive system design? An alternator with worn bearings will likely produce an insufficient charge to operate the engine and charge the battery.

Alternator OVERDRIVE GROOVE PULLEY Honda Toyota Cummins. To test for worn bearings, remove the belt and turn the pulley by hand. If noises are heard or the pulley does not turn smoothly, the bearings are worn and the alternator should be replaced.

The idea is that the locks in one direction, and freewheels in the other direction.

Differences in pulley size can lead to reduced electrical power and over or under charging. Secure the alternator in a vise Replace alternator decoupler pulley 2) Use a screwdriver to remove the plastic cap. You cannot reuse the cap once you’ve removed it.

Install the removal tool in the hex recess and use the appropriate socket and. 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.

Direct bolt on, no cutting on hood! Exactly the same pulley as fitted to the genuine engine, making it easy to fit with the correct shaft and fitting dimensions. Pulleys are simply a means of transferring power. Over the years I have seen people struggle for hours, even days to remove an alternator pulley.

Your alternator is one of the most important parts of your vehicle. While the battery is responsible for starting your car, once it’s cranked and running, all the electricity used by the engine and your various accessories is supplied by the alternator. Also, because your alternator is spinning faster the fan will move more cooling air through the alternator. Since aluminium is lightweight yet mechanically durable, it is an ideal pulley to use, especially in high temperature operations.

There are belt top width choices in 10mm or 13mm at competitive prices. The most common cause of a whining alternator is a worn out alternator bearing. This is often due to an overtightened fan belt wearing down the unit. Unfortunately, bearing replacement is a short-term fix and you may be better off replacing the unit entirely. Other issues that may be causing a noisy alternator include the following.

This also allows the alternator to spin at its own speed when the engine is decelerating.