Should a belt tensioner move

The tensioner arm should move smoothly and freely. Solution: If you notice a binding, sticking or grinding tensioner arm, the tensioner should be replaced.

Should my belt tensioner bounce?

It is important to note that any abnormal chattering or bouncing of the tensioner arm under normal operation indicates the tensioner has already failed and should be replaced.

Should belt tensioner bounce at idle?

Absolutely you’ll see it bouncing slightly. The reason is, the belt will stretch and contract slightly as the engine speeds up/slows down. The tensioner provides two different functions: Provides tension to keep the serpentine belt tight during operation.

How much play should a belt tensioner have?

The required measure of tension in the serpentine belt is that it should not deflect more than ½ inch when twisted either way from the middle. If twisted more, the belt is loose, and if twisted less, the belt is too tight. Either of the positions does not work for the vehicle.

Is the tensioner pulley supposed to spin?

Checking the Tensioner Spin the pulley to see if it spins freely. If you hear grinding or the pulley doesn’t spin freely, replace the tensioner. When you replace the belt, it should take a lot of muscle power to move the tensioner. If you can move it easily, the spring tension is most likely not tight enough.

Does an idler pulley rotate?

The idler pulley is a common part that’s found on the majority of the vehicles on the road. Its primary function is to provide tension and guide the engine drive belt. … Like many automotive parts, the idler pulley becomes worn over time. The pulley spins against the belt wearing down both parts.

Can you over tighten an alternator belt?

Dear Anthony: A belt should never be over-tightened. … An over-tightened belt can burn out any bearing that the belt rotates on, including alternator, power steering pump, A/C compressor, idler pulleys, etc. An over-tightened timing belt can ruin any pulley bearing it is connected with.

What would cause a tensioner to go bad?

Any damage to the automatic tensioner pulley can cause damage to the belt tensioner due to the vibrations caused by the pulley. Physical damage to the pulley is an indication of extreme tension or physical interference.

What happens when tensioner goes bad?

Driving with a bad belt tensioner is unsafe since the tensioner is meant to guarantee ample tension that powers accessories. Wear on the belt tensioner will eventually cause the belt to slip, generate loud noise, and also create an unsafe level of heat along the accessory pulleys.

Can a bad tensioner cause engine vibration?

If you suspect you’re dealing with a failing tensioner or idler, you’ll want to watch for the following symptoms: … Excessive tensioner movement – Worn-out coil springs can also cause drive belt tensioners to loosen their grip on the drive belt, resulting in excessive vibration and rattling.

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Can a bad belt tensioner cause overheating?

Many of the engine’s accessories, such as the alternator, water pump, and AC compressor, can be belt driven. A seized or loose drive belt tensioner can cause the belt to snap, which will disables those accessories and can cause problems such as overheating, a dead electrical system and battery, or a disabled AC system.

Can you over tighten a tensioner pulley?

Test the proper tension on the belts. … Over-tightened belts can cause internal damage to the bearings inside the pulleys. It can also cause overheating of the belts and premature wear. Put the vehicle back together by replacing the components required to access the belt tensioners.

How tight should the belt be on a alternator?

You want to be able to press down on the belt at a mid point between two pulleys and only be able to move it downward about 1/8 to 1/4 inch. When you have the alternator in the right position, have an assistant tighten the top bolt and nut to lock the alternator in.

How tight should alternator bolts be?

Make sure the bolts are snug enough to hold the alternator in place, but loose enough to slide side to side in the bracket.

Should the idler pulley move?

Excessively Loose Idler Pulley The loose pulley can make chattering noises as it spins and the vibration can knock the serpentine belt off. … If the pulley is excessively loose and there is a lot of play after wiggling it back and forth, it needs to be replaced. A normal pulley in good condition will only move slightly.

Is idler pulley same as tensioner?

The primary distinction between tensioners and idler pulleys is the presence of an adjustable bolt. Tensioners are positioned on the bolt through mounting. Idler pulleys are not mounted to an adjustable bolt. … However, if bearings fail, tensioner and idler pulleys both require replacement.

How do you know if your belt is loose?

A loose drive belt will often be noisy, squeaking a bit, or emitting a high-pitched squeal. The most obvious sign of a loose drive belt, though, is in its appearance and tension. A loose belt, simply stated, looks and feels loose.

Why is my belt tensioner shaking?

Causes of Belt Tensioner Wobbling In general, belt tensioners tend to get noisy when they fail. If your belt tensioner is chirping or makes other noises, it is often an indication that the part is old and needs to be replaced. You can even remove the belt, spin each pulley, and listen for rumbling or other noises.

Can bad pulley cause vibration?

The most common symptoms of a bad crankshaft pulley are engine vibration and irregular engine idle. It may also result in a damaged alternator, power steering pump, or a failed transmission if you are unlucky.

Can a bad serpentine belt cause a car to shake?

If the belts are loose or worn out, they can cause other parts of the engine to not work properly, which can cause strange noises and shaking. …

What does the serpentine belt tensioner do?

Many of today’s vehicles are equipped with a self-tensioning device called an automatic belt tensioner. These tensioners are designed to hold a predetermined amount of tension on the serpentine belt so it functions properly and keeps your car cruising. Your serpentine belt is like one giant, fast-spinning rubber band.

Can slipping serpentine belt cause overheating?

Since the serpentine belt helps provide power to cool the engine, a failing belt can cause your engine to overheat as the water pump will not turn.

Is my alternator belt too loose?

If your alternator belt gets too loose as you’re driving, it may cause your engine to stall. This means that you’re engine essentially shuts down and you’ll be forced to pull over onto the side of the road. Obviously, you wouldn’t want this happening on a busy street or rush hour traffic on the highway.