Why does my alternator have a clutch?

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 you tighten the pulley on a alternator?

Tighten the pulley nut hand tight with the socket and extension. Then wrap a the vee belt around the pulley gripping the belt around the pulley tightening further with the socket + ratchet. Mount the alternator on the engine with vee belt fitted and tensioned.

Should an alternator pulley spin both ways?

OADs should have a smooth spring feel in the drive direction and spin freely in the opposite direction. If not, the OAD requires replacement.

Should an alternator spin both ways?

The alternator will work in either direction but the fan has to be matched to the direction of rotation so that it blow air INTO the alternator.

How do you know if your alternator pulley is bad?

If you ever hear growling or whining noises coming from under the hood, you could have alternator problems, which should be checked out by a professional ASAP. This growling or whining sound happens when the belt that turns the alternator’s pulley becomes misaligned or rubs against the side of the pulley.

Can you spray WD40 on an alternator?

No, you cannot spray an alternator with WD40. As I said earlier, WD40 is a fluid cleaning agent. Plus, a nice intentional way to destroy or reduce the lifespan of an alternator is, by spraying a liquid agent in it. When you spray a WD40 on an alternator, it would also find its way into other areas it doesn’t fit.

What is the purpose of a decoupler pulley on an alternator?

An OVERRUNNING ALTERNATOR DECOUPLER™ pulley helps “synchronize” the belt drive system for improved engine efficiency, reduced Noise/Vibration/Harshness (NVH) and increased component life. When an engine accelerates, the alternator’s mass creates resistance against the belt.

How tight should alternator pulley nut be?

about 70 ft-lbs
Tighten the nut with an impact wrench until the lock washer is completely closed and the nut is tight (about 70 ft-lbs). Do not over tighten. If your alternator has an internal fan: 1.

What happens if alternator belt is to tight?

If the belt is too tight, it will cause excessive side loads and overheat the bearings. This in turn causes noise, decreased output and even the seizing of the alternator. If the belt is too loose, it will cause the alternator to slip.