can alternator pulley go bad

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.Aug 24, 2020

Can I replace just the pulley on an 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. … Don’t fit the new cap until you are absolutely sure the new pulley is fixed correctly.

How long does an alternator pulley last?

The expected life span of a decoupler type pulley, according to the website of the company that manufactures them, is 40,000 to 60,000 miles.

How much does it cost to replace an alternator pulley?

There is an average cost for a drive belt idler pulley replacement. Labor costs are between 64 and $81 while parts are between $79 and $83. Taxes and fees are not included in the estimate.

What do bad pulleys sound like?

When the grooves on the pulleys are not holding on to the belts, you will hear a loud noise coming from the engine. The bearings will make a rattling sound if they’re worn out. They will remove the belt from the pulley and try to turn it on their own. …

How long does it take to change an alternator pulley?

If you decide to change it yourself at home without much experience, it should take you around 3-4 hours, depending on your vehicle’s make and model.Dec 13, 2021

Should my alternator pulley spin freely?

It should turn quite easily but more important is it should be smooth. Very smooth. New bearings will sometimes feel a bit stiff and not turn freely because of the new seals and new grease that is in them. However that is ok as long as they are smooth.

How much does it cost to replace a pulley?

The cost to replace the idler pulley of your driver belt will usually be somewhere between $80 and $200. The cost for the new part should only be anywhere from $40 to $90, while the cost of the labor will be anywhere from $40 to $110.Dec 18, 2020

When should I replace pulleys?

An idler pulley is expected to wear over time, and eventually the pulley will fail. Replacement intervals for idler pulleys vary, but are usually within the 50,000 to 100,000 mile range. Replacement often coincides with expected serpentine/accessory belt replacement periods.

What causes alternator to go bad?

Most of the time, alternators fail as a result of age or use. However, some other factors can cause an alternator to fail prematurely. Fluid leaking on the car alternator can commonly lead to failure. Often, engine oil or power steering fluid can work its way into the alternator and cause it to malfunction or fail.Jun 25, 2021

How long do tensioner pulleys last?

Most modern cars that roll off the dealer’s lot as a new vehicle will have a 60,000 to 100,000-mile life expectancy for the serpentine belt, tensioners, and idler pulleys.Jun 1, 2020

What causes a tensioner pulley to go bad?

Rust or corrosion can build up around the tensioner, as well as dirt and mud. Rust prevents the tensioner from spinning freely, which can cause further damage to the engine.

Can a bad idler pulley cause alternator problems?

Alternators are DRIVEN by the serpentine belt. All that happens when the belt disappears or pulleys seize is the alternator stops turning; there is NO possibility of damage to the alternator.May 5, 2017

What noise does a bad idler pulley make?

When the grooves on the belts are not holding on to the pulleys, you will hear a noise coming from the engine. They will make a rattling sound if the bearings are worn out.

What does a bad alternator belt sound like?

Symptoms of a broken serpentine belt include loud slapping, squealing or knocking noises coming from under the hood. The battery-shaped charging system warning light might also come on because the alternator will stop charging the battery.Nov 17, 2018

Why is my alternator pulley squealing?

An alternator’s bearings can become worn and create noises, including a squeal. … 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.

What happens when a pulley goes bad?

A damaged pulley can cause the drive or serpentine belt to dislodge. If that happens, all components that derive power from that belt will stop functioning. On most vehicles, these parts include the alternator, water pump, power steering, air conditioning system, and different exhaust components.Jan 11, 2021

Why do alternators have a clutch pulley?

The alternator pulley is also vital to absorbing crankshaft pulsations from hitting the alternator. … A failed pulley will no longer clutch properly. The action of slowing down the alternator forcefully puts a lot of extra stress on the accessory/serpentine belt system.Jul 9, 2018

How long should it take a mechanic to change an alternator?

In general, it will take about two hours for you to replace an alternator on your own, though this could vary somewhat depending on your knowledge of car mechanics.Dec 13, 2018

How easily should an alternator spin?

Most alternators need to spin at about 2,400 rpm at idle, have their maximum output above 6,000 rpm, and should never exceed 18,000 rpm.Jun 1, 2002

How do you check alternator bearings?

Turn the alternator gently by hand. Reach down to feel the bearings as you turn the alternator. If you hear squeaks or sounds are heard or if the bearings feel rough as the alternator is turning, the bearings could be bad. Push up and down on the fan.

Should an alternator make noise when spun by hand?

Squeaking When You Turn Alternator Pulley and the Car Is Off Turn the alternator pulley by hand and listen for any squeaks as it spins. If you hear squeaking from it, then you’ll likely need to replace the noisy alternator bearing or alternator.Aug 22, 2021

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