To unhook the pulley from the alternator, use a 1/2″ Impact wrench drive in order to remove the nut. Most automobile Alternator pulleys utilize 15/16 sockets. Keep the pulley for the alternator firmly. Use an abrasive or an extra heavy glove. Alternators with external fan options can tear up your hand if you allow the fan to spin when you remove the pulley. It is suggested to wear a glove with a protective cover and eyewear is worn. The pulley nut is made of normal right-hand threads that move in a counter-clockwise direction to be removed when looking towards an angle of the alternator.

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Alternator pulleys don’t have keys and must be fitted with a slip. Sometimes thread lock fluid or rust can get between the pulley and the shaft and a tiny quantity of warmth or pulling can require to take off the pulley. Take cautious not to overheat. Replace the pulley with the lock washer and the nut manually. Make sure the nut is tightened using an impact wrench to ensure that the nut is secure (about 70ft-lbs). The lock washer needs to be fully closed. Don’t over-tighten.

The protective cap made of plastic is not reusable after it is pulled off of the pulley. A replacement cap will be provided with the replacement part. Don’t install it until you’re certain that the pulley has been installed in the correct way. Some caps can’t be taken off without damaging them following installation.

Many internal fan alternators utilize self-locking nuts that do not have a separate lock washer. You can also apply thread-locking fluid to hold it better. The typical automotive pulleys are constructed for a 17mm shaft. Smaller models have 15mm shafts and certain pulleys will require an adapter bushing.

Alternator pulleys are essential in accessories belt drives. When the engine slows down when gears are changed or during engine shut-down, the inertia of the alternator creates resistance to the belt. Alternator pulleys allow power supplies to “overrun” in the event that the belt abruptly decreases. This helps to stop the belt from sliding and minimizes wear, vibration, and chirp sounds.