Why does the serpentine belt keep coming off?

Serpentine Belt Keeps Coming Off. The most common reason is that the serpentine belt is just worn out and needs to be replaced. Another common cause is that the belt tensioner is froze / stuck and not functioning. The tensioner does exactly what it’s name says- keeps tension on the belt. Without tension the belt will come right off.

What causes a belt to walk off a pulley?

It is a solid pulley that just keeps the belt riding true. What happens is that the bearing for any of these pulleys the belt rides on is worn out, so the pulley either wobbles or does not sit flat and gives the belt a chance to “walk” off the pulley.

Is the Duramax engine in the GMC Yukon?

Officially, this engine is also found in the 2020 GMC Sierra 1500, 2021 GMC Yukon and 2021 Chevy Suburban. Although, it is absent in both the off-road versions of GM’s full-size SUVs (more on that in another story).

What causes a belt to come off without tension?

Another common cause is that the belt tensioner is froze / stuck and not functioning. The tensioner does exactly what it’s name says- keeps tension on the belt. Without tension the belt will come right off. This is the part that you must adjust or release the tension to install the belt.

Why is my belt not sitting perfectly straight?

Another possible cause is that one of the components with a pulley that the belt rides on is worn out and not sitting perfectly straight. This could be the water pump, power steering pump, A/C compressor or what is called the idler pulley. The idler is different than the tensioner.

Why is my belt tensioner not working properly?

Another common cause is that the belt tensioner is froze / stuck and not functioning. The tensioner does exactly what it’s name says- keeps tension on the belt.

Is the water pump driven by the serpentine belt?

Another important device driven by the serpentine belt is the water pump. This is not always the case as on a lot of cars the water pump is driven by the timing belt. You should have this in mind so you don’t falsely “accuse” the serpentine belt for overheating.

Do you need to spay the serpentine belt?

While keeping the engine in running state, spay the belt dressing onto serpentine belt and back of the fan belt. You don’t need to move the spray around the belt; the running engine will spin it, and allow to spread the belt dressing to the entire belt.

Why does my serpentine belt make a screeching sound?

The belt slides over a motionless pulley causing extensive friction, heat and the recognizable sound. The screeching sound may also be caused by a severely worn out serpentine belt (in this case, it must be nearly pulverized).

What causes a serpentine belt to come off?

Belt coming off: Pulley misalignment, belt misalignment on pulley, defective tensioner, or bearing wear in tensioner, idler or driven accessories Belt noise can be hard to isolate, as the sound may seem to be coming from an accessory drive, such as the alternator or air conditioning compressor.

How do you replace a serpentine belt pulley?

Using the breaker bar or serpentine belt tool, move the tensioner arm against the spring as far as it will move, to its stop. The tensioner arm should move smoothly throughout its range of travel, with firm spring pressure and without binding. Most tensioner pulleys can be replaced independently of the tensioner itself.

What causes glazing at the edges of a serpentine belt?

Glazing at the edges of a serpentine belt, or on its ridges or in the grooves, results from the belt slipping. It indicates that friction between the belt and the accessory drive pulley (s) created by slipping has overheated the belt. Fraying at the edge of a belt indicates pulley misalignment.

An expert that got 5 achievements. With the belt on. Look at it inline with it. Every pulley should be inline/straight. If one is slanted just a little it will throw the belt. The only other thing would be the tensioner is bad.

Why does my car make a slipping belt noise?

Belt noise can be hard to isolate, as the sound may seem to be coming from an accessory drive, such as the alternator or air conditioning compressor. A noise that occurs only when the vehicle accelerates is likely to be a slipping belt, as is a noise that occurs only when the car is started cold.

What kind of car has serpentine belt problems?

If a belt problem still isn’t solved after doing all of the above, your car may have a specific problem unique to that make and model. Certain vehicles have known serpentine belt problems, such as 1996–2000 Chrysler-built minivans with the 3.0-, 3.3-, and 3.8-liter engines.

Why is coolant leaking from my serpentine belt?

Coolant leaking from the weep hole means it is time for a new water pump, but it also may indicate that the water pump bearings are worn. If the water pump is leaking, check the serpentine belt for signs of fluid contamination.

What happens when the timing belt is broken in a car?

If the timing belt has broken inside, the engine will not be able to turn over or ignite. When you turn the key, you might hear the starter motor engage, but since the timing belt operates the crank and camshaft, it will not turn over.

What happens when a belt is worn out on a car?

What happens is that the bearing for any of these pulleys the belt rides on is worn out, so the pulley either wobbles or does not sit flat and gives the belt a chance to “walk” off the pulley. A worn out pulley will usually be accompanied by a growl or whining noise when the engine is running.

When does the serpentine belt come off on a 2006 Ford Fusion?

Today is the4th time that the serpentine belt has come off on my 2006 Ford Fusion with a 4Cyl engine. Have had the valve cover gasket replaced due to excess oil on belt and the cover was leaking. Have had all the pulleys cleaned and the belt replaced twice since then. any ideas?

When does a V-belt slip what happens?

What is belt slippage? Belt slippage occurs whenever torque demand exceeds the available friction between a V-belt and one or more of the pulleys (sheaves). When this occurs, the belt begins to slide backwards a bit as it moves with the pulley. This action is similar in two ways to slightly slipping the clutch in a manual transmission car:

When did the serpentine belt come off the Chrysler 3.3L?

The 3.3L and 3.8L engines are the ones with the most problems when it comes to the engine belt coming off. The model years are 1996 through 2001, but I’ve seen older and newer ones do the same thing.

What can I do about the belt coming off problem?

What solves the belt coming off problem is the ridge or guide on the new and included pulleys. The drawback is, this feature also makes the new belt harder to install. For this reason I recommend getting a special serpentine belt tool to give you the extra leverage needed to fully disengage the tension spring.

Do you need a serpentine belt for Mopar?

For this reason I recommend getting a special serpentine belt tool to give you the extra leverage needed to fully disengage the tension spring. This assures you’ll get just enough slack to squeeze the ribbed side of the belt over the ridge guide. Overall I’ve had little experience with Mopar products.

Why does my Blade drive belt keep slipping off?

First, how old is your machine and how many hours are on the clock. Now, generally speaking a belt is thown for one main reason, pulley miss alignment. Check your bearings with the belt removed to see if you have any worn out that would alow a pulley to sag. You may want to replace the tensioner spring, these get old and lose some force.

Another common cause is that the belt tensioner is froze / stuck and not functioning. The tensioner does exactly what it’s name says- keeps tension on the belt.

Why does the serpentine belt keep coming off?