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The Ultimate Drive Belts Buying Guide


You Should Know This About Your Drive Belts

Drive belts are a very important part of the engine as they make many components function properly. If you end up with a broken drive belt, the alternator, water pump, steering pump, etc. can stop working at the same time. The quick response from these components is essential when driving on busy roads or highways, whether you have a sedan, SUV, or a heavy-duty truck you will find the drive belt. This drive belt guide will help you understand the importance of the drive belt so you can buy the correct belt for your vehicle.


What Are Drive Belts?

A drive belt is used to connect the various auxiliary and even internal components to the engine like the alternator, power steering, AC, etc, The drive belts are driven by the engine crankshaft. When the engine rotates, all the important components come into action because of the drive belt. Drive belts transfer rotational motion from one end to the other efficiently. A car also has a timing belt that synchronizes the timing of the crankshaft with the camshaft, so that the engine's valves open and close at the proper times.


Which Type Of Drive Belt Should I Choose?

There are many kinds of drive belts that are used in almost all vehicles. The shape and size can vary according to the car’s make and model. The drive belts can be categorized into two types. 


Based On Fitment

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1. Engine Timing Belts

Engine timing belts play an important role in the function of an internal combustion engine. They synchronize the timing of the crankshaft with the camshaft, so that the engine's valves open and close at the proper times during each cylinder's intake and exhaust strokes. Even the slightest error in the timing can cause the engine to not run properly; in some cases, the piston can even bump into the valves, which could cause severe damage to the engine. This type of belt cannot be seen as it is covered with a timing cover. 

2. Accessories Belts

These belts can come in different sizes and different shapes depending on what type of pulley is fitted. The length can vary depending on what accessories are fitted in the car. Depending on the model of the car, the engine can have an AC compressor, power steering pump, alternator, fan pulley, idler pulley or idler bearing, air pump, vacuum pump, brake booster pump, and many other such accessories that can cause the size of the belt to increase.

Based On Belts Shape

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1. V-type Belt

V-belts are made from rubber or synthetic rubber stocks, due to which they are flexible to bend around the pulley. V-type belts are fitted in older vehicles, the vehicle can have one or a couple of belts coming off the crankshaft. Each belt has its own individual accessory group such as the alternator, A/C compressor, water pump, etc. All accessories have a pulley fitted for the V belt to ride in the grooves of the pulleys. V-belts have sidewalls that fit into the grooves of the pulley, providing additional surface area and better stability. The V shape of the V-belt helps to guide back the belt into place if the alignment is slightly off. They can be used in any orientation - vertical, horizontal, etc. In a working engine, they provide the best combination of traction, speed, bearing load, and extended service life. 

2. Wedge Type Belt

Wedge-type belts are the same as V-type belts, but they are narrower than V belts. Their wedge shape makes them able to use a smaller pulley that makes the drive system more compact. Wedge-type belts are useful if your goal is to maximize power transmission efficiency by reducing drive weight and size. They have a greater depth-to-width ratio, placing more of the sheave under the reinforcing cord due to which the wedge-type belts handle an equivalent load.

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3. Cogged Type V Belt

Cogged type belts have notches that help to reduce bending stress, allowing the belt to fit easily on small diameter pulleys and provide better heat dissipation. The major contributor to premature belt failure is excessive heat. Cogged type belts are engineered for balancing acts between flexibility, tensile cord support, and stress distribution. These belts have perfectly spaced and shaped notches which help to distribute stress forces evenly as the belt bends, preventing under cord cracking and extending the belt’s life. They are ideal for use in small-diameter pulleys, drives with twists or turns, or sprocket pulleys to limit slip. They are not intended for use in clutching applications.

4. Flat Ribbed Belt 

Flat belts are much thicker by comparison and fit all accessories under one belt system. Flat belts are used in new vehicles because they are less complicated to install and are easier to maintain. Flat belts can have ribbed structures. The multi-rib design of the flat belt gives a better belt to pulley contact ratio that creates less slippage. Flat belt systems use only one belt due to which there is less distance between the accessories, which simplifies the engine compartment.



Do All Vehicles Have Timing Belts?

Every vehicle has a crankshaft and camshaft which has to be connected with an intermediate. Not all vehicles have timing belts, some may even have a timing chain. The timing chain and the timing belt are different, but they serve the same purpose. The timing chain is fitted on the sprocket wheel whereas the timing belt is fitted on the toothed wheel.


Timing Belt

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Toothed engine timing belts are rubber composite belts with high-tensile fibers. They are quieter in their operation, less expensive, and more efficient. These types of timing belts do not require lubrication, which is essential in a timing chain. Timing belts are available in two sizes, millimeters, and inches. The teeth of the timing belts are also different. The most common forms are trapezoidal and round teeth. Timing belts can vary from vehicle to vehicle; there may be minor changes like minor variations in tooth profile, tooth angle, and depth.

Timing Chain

Timing chains are like bicycle chains. Timing chains have the same function as a timing belt, but timing chains usually last longer. Most manufacturers recommend replacing it at certain intervals, but some suggest that it will last as long as the car itself. For proper working of your car, it is always better to stick to the manufacturer's recommendations. Timing chains are noisy while working but are more durable than timing belts. Timing chains need lubrication for optimal functionality, which increases maintenance and cost. If the chain breaks at a low rpm, it may not cause any serious damage. But if it breaks at a high speed, it will destroy almost everything that comes in contact. A timing chain has tensioners, which put the chain in place. In some engines, the tensioner is controlled by the oil pressure. If the oil pressure becomes low because of any reason, the tensioners will fail, and so will the timing chain.


What Are Drive Belt Tensioners And Why Do I Need Them?

The vehicle speeds up and slows down, which makes the belt stretch or lose some tension, which can cause it to jump off a pulley. The function of a belt tensioner is to keep the proper tension on the belt at all times so that it can properly drive the vehicle’s accessories. A drive belt tensioner can be a covered bearing or a pulley that is used to keep tension on the engine belts. The belt tensioner doesn’t allow the belt to slip. The belt tensioners are found in the engine timing belt assembly and in the accessories belt area. There are a few types of belt tensioners used on vehicles, the shapes and construction can change, but they serve the same purpose.


Based On The Construction

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1. Manually Type Belt Tensioner

Manual belt tensions are commonly found in old engines. This type has the nuts fitted on an adjuster bolt. A bolt adjusts the tensioner pulley’s position during installation. The belt stretches over its lifetime due to which an adjustment is needed and is done during routine maintenance checks.

2. Spring Type Tensioners

Spring tensioners are designed to develop tension automatically. The self-adjusting pulley or bearing is spring-loaded and provides its tension on the belt. The tension is created because of a spring that is coiled on the side of the tensioner. This type of tensioner gives a perfect pressure on the belt that is not more or less, and it maintains its tension at any speed of the engine.


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3. Hydraulic Type Belt Tensioner

Many modern cars have a hydraulic belt tensioner, where the pressure is provided with a little absorber instead of the spring. The tension is constantly maintained by the shock absorber.

What Should I Look For When Buying A Drive Belt Or A Belt Tensioner?

Compatibility

Compatibility is the most important factor while buying a drive belt, as there are different sizes and types of belts. The length of the belt can vary according to parts that need a motion from the belt. Depending on the vehicle you drive there may be components such as the alternator, steering pump, AC compressor, and many more, the more the components the bigger the belt. It is necessary to match the length of the old belt with the new one. Drive belt tensioners can have a pulley or a bearing. Always look for the same size, if the size increases it can put extra pressure on the belt. Look for a tensioner with rust protection coating because corrosion and decay can shorten your part’s life.


Choosing A Brand

Drive belts and tensioners are important parts of the vehicle. If you are not sure about the brand, it is not wise to buy lower-quality parts. OEM drive belts and tensioners are well known because they are made for maximum strength in your specific vehicle. Some aftermarket brands which are mentioned below will always help you save in the long run because they match the fit and performance of the OEM parts, and some even exceed that providing more features and benefits. Refer to the top brands mentioned along with their features to choose one that meets your requirements.


Checking For Fitment

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Replacing a drive belt or a belt tensioner can be a tough job. If not paid attention, there are more chances of wrong routing of the drive belt which can cause the important parts not to function properly. For this always check the routing of the belt by taking a photo of it or checking it with the vehicle's manual. The belt tensioner should also be checked for noise or other abnormalities such as cracks.

Which Popular Brand Of Drive Belts Should I Choose?

Gates Belts And Tensioners

For more than a century, Gates have the best teams of automotive professionals that design, develop and manufacture automotive parts. Gates proudly supplies the same quality, reliability, and performance to their parts which are sent worldwide. Their complete aftermarket solutions feature accessory drives, engine timing, cooling, and more, which are designed specifically for the OE quality and performance requirements of your vehicle.



Serpentine Belts Part Number: K040322, K040378, K060824, K040350, and more.

Features

  • Lasts 50%-60% longer than normal belts.
  • Precise dimension control of rib profile transmits load efficiently allowing components to operate at optimum levels.
  • Able to operate and accept misalignment better than other serpentine belts.
  • The flexible construction of these belts allows them to withstand many topside and backside bends resulting in long belt life.
  • It has been designed and manufactured with advanced technology and premium.
  • EPDM offers superior ABDS and new vehicle type performance to the customers. 


Air Conditioning Compressor Belts Part Number: 7445, 9470, 7450, 7375, 9447, 7480, and more.

Features

  • Fiber-loaded rubber stock adds more flexibility to the belt length along with great lateral stability in the pulley.
  • Tensile cords when properly installed and tensioned get thermally active and hence offer maintenance-free performance.
  • To ensure the proper fitment in the pulley, along with smooth and silent working, it has precise top width and sidewall dimensional control.
  • Always match or exceed the SAEJ 636c specifications.


Alternator And Fan Belts Part Number: 7445, 9470, 7450, 7375, 7460, 7440, and more.

Features 

  • Fiber-loaded rubber stock adds more flexibility to the belt length along with great lateral stability in the pulley.
  • Tensile cords when properly installed and tensioned get thermally active and hence offer maintenance-free performance.
  • To ensure the proper fitment in the pulley, along with smooth and silent working, it has precise top width and sidewall dimensional control.
  • Always match or exceed the SAEJ 636c specifications


Engine Timing Belts Part Number: T282, T329, T284, T257, T312, T199, and more.

Features

  • To minimize frictional loss and tooth shear, jackets are infused with PTFE.
  • For superior heat and contamination resistance, it has high-grade HNBR rubber.
  • To offer maximum strength tensile members of premium quality are used.
  • The backsides of the belt have aramid reinforced nylon jackets which increase its durability.
  • It comes with a genuine warranty equivalent to OE replacement.
  • Aramid reinforced nylon jackets for longer wear.


Belt Tensioners Part NumberT43129, T43138, T43098, T43193, T43135, T41231, and more.

Features

  • The belt tensioners are designed to meet or exceed OE replacement.
  • OEM quality standards
  • Belt tensioners can be directly fitted
  • The belt tensioners have the best quality at an affordable price
  • Manufactured to meet exact requirements
  • Fast and smooth installation


Belt Tensioner Assembly Part Number: 38274, 38159, 38158, 38103, 38452, 38278, and more.

Features

  • To improve the life of tensioners, belts, and accessories, the belt tensioner assembly comes with a Patented Vibration damping system.
  • For better output control, belt tensioner assembly has tighter dimensional tolerances
  • It has less heat build-up which gives longer tension life.
  • Even rotational load offers resistance to a compressive force.
  • For stable operation, it has a dampening mechanism that absorbs shock loads.
  • Exact machined surfaces and assembly tolerances for a perfect fit.
  • Made with high-quality casting that exceeds OE requirements.
  • Gates manufactures full-line coverage for Import, heavy-duty, and domestic applications.


For more, you can visit our Gates Belt And Tensioner section.


Dayco Belts And Tensioners

Dayco uses the latest advanced engineering technologies, such as EPDM compounds molded belts, and aramid reinforcement, all of which result in a cooler running belt longer lasting, with less slippage and reduced noise and vibration.



Serpentine Belts Part Number: 5040355, 5040378, 5060495, 5060840, 5060695, 5050547, and more.

Features

  • Offers great bending flexibility for usage on pulleys with small diameter
  • Both sides of the belts are engineered as per “DPK” (Double Poly-V)
  • High operating temperature resistance makes it last longer and service-free life
  • Dayco has adopted the demands of the automotive sector and has developed the latest generation of serpentine belts for the aftermarkets which can handle high workloads and maintain constant high performance.


Air Conditioning Compressor Belts Part Number: 15450, 17370, 15300, 17600, 15375, 17420, and more.

Features

  • Offers great bending flexibility for usage on pulleys with small diameter
  • Both sides of the belts are engineered as per “DPK” (Double Poly-V)
  • High operating temperature resistance makes it last longer and service-free life.
  • Dayco has adopted the demands of the automotive sector and has developed the latest generation of serpentine belts for the aftermarkets which can handle high workloads and maintain constant high performance.


Alternator And Fan Belts Part Number: 15450, 17370, 15300, 15375, 15275, 15420, and more.


Features

  • Offers great bending flexibility for usage on pulleys with small diameter
  • Both sides of the belts are engineered as per “DPK” (Double Poly-V)
  • High operating temperature resistance makes it last longer and service-free life
  • Dayco has adopted the demands of the automotive sector and has developed the latest generation of serpentine belts for the aftermarkets which can handle high workloads and maintain constant high performance.


Engine Timing Belts Part Number: 95249, 95187, 95283, 95294, 95246, 95244, and more.


Features

  • Fitted in high diesel injection pressure where in some applications it exceeds 2000 bar
  • Can be fitted to multi-valve motors: double camshaft with high loads
  • Easily withstands engines with high power and engine compartment temperatures above 120°C/250°F.
  • Helps to reduce noise.
  • Has a minimum dimensional tolerance.
  • Helps to reduce elongation
  • The cover fabric on the teeth offers resistance to high abrasion
  • Offers a longer duration and great performance.

Belt Tensioners Part Number: 85010, 85056, 85027, 85004, 85043, 85067, and more.

Features

  • Comes with a steel locator pin (as per the demand of application)
  • Made up of tough cast aluminum spring case to prevent cracking and fatigue.
  • Tough cast aluminum arms add strength with less distortion.
  • Steel pivot tubes (wherever requires) give more strength for critical torque requirements.
  • To keep out the harmful contaminants, thermoplastic rubber spring slot plugs (wherever required) help a lot.
  • Spring bushing and lubricated nylon pivot tube bushing help in giving a noise-free performance.
  • “O” ring rubber (wherever applicable) helps to seal against grime and dust.
  • Mounting bolts with a zinc coating (wherever required) helps to combat rust.


Belt Tensioner Assembly Part Number:  89266, 89258, 89251, 89253, 89252, 89264, and more.

Features

  • Comes with a steel locator pin (as per the demand of application)
  • Made up of tough cast aluminum spring case to prevent cracking and fatigue.
  • Tough cast aluminum arms add strength with less distortion.
  • Steel pivot tubes (wherever requires) give more strength for critical torque requirements.
  • To keep out the harmful contaminants, thermoplastic rubber spring slot plugs (wherever required) help a lot.
  • Spring bushing and lubricated nylon pivot tube bushing help in giving a noise-free performance.
  • “O” ring rubber (wherever applicable) helps to seal against grime and dust.
  • Mounting bolts with a zinc coating (wherever required) helps to combat rust.


For more, you can visit our Dayco Belt And Tensioner section.


Bando USA Belts And Tensioners

Bando USA belts are one of the most demandable brands in the market at present conditions. Backed by superior materials and rigorous testing, Bando USA belts deliver the reliable performance you can count on. Every component they make is thoroughly checked, due to which they deliver 100% satisfaction.



Serpentine Belts Part Number: 7PK1300, 5PK1065, 4PK960, 6PK2130, 6PK2135, 7PK2120, and more.

Features

  • These belts have extensive coverage for domestic and imported applications.
  • Due to the combination of OE technology and experience, these belts outperform the competition.
  • These belts are flexible, oil, and heat resistant.
  • Tough tensile cords carry high loads without stretching.
  • The belt's rubber ribs are compounded from high-strength synthetic rubber for long life.

For more, you can visit our Bando USA Belt And Tensioner section.


Transit Warehouse Belts And Tensioners

Transit has been operating since 1971, being the largest warehouse for auto parts in eastern Canada. The company provides superior quality and specialized parts for the automobile. They offer a wide range of parts and accessories for vehicles, light trucks, and buses. 



Serpentine Belts Part Number: KBR-5060840, KBR-5070852, KBR-5061005, KBR-5060900, KBR-5040333, KBR-5060825, and more.

Features

  • In comparison to neoprene rubber belts, it offers an increased service life of over 50% (approx. 150,000 km)
  • To reduce the chances of cracking and fraying, each belt undergoes electrochemical treatment.
  • Increased dependability even in tough climates including heat-sensitive applications.
  • Perfect construction ensures accurate installation on every vehicle.


For more, you can visit our Transit Warehouse Belts And Tensioners section.


Dorman/Techoice Belts And Tensioners



Belt Tensioner Assembly Part Number: 419-015, 419-109, 419-022, 419-013, 419-123, 419-016, and more.

Features

  • Perfect replacement – this belt tensioner is a straight replacement for the original one on specified years, makes, and models of the vehicle.
  • Long-lasting construction – Made up with quality components for long-lasting performance.
  • Economical solution – Get the original fit and function of equipment at a reasonable price.
  • Quality tested  - To ensure dependable performance and fitment, this tensioner assembly has been tested against corrosion, torque, spring-back, and vehicle fit.


For more, you can visit our Dorman/Techoice Belts And Tensioners section

When Should I Change My Drive Belt And Belt Tensioner?

Drive belt and belt tensioner usually wear out around the same time, and both should be replaced. The aim is to replace it before it breaks down and causes your vehicle to run with major problems. A drive belt can last from 50,000 to over 80,000 kilometers or about five years before it needs to be replaced. Some can even last for up to 100,000 kilometers with no problems. Despite that, over time, the drive belt and the tensioner will fail because of the heat and friction. Most car manufacturers don't specify the replacement intervals, but often recommend checking the belt and the tensioner during regular services. When your car is in for a regular oil change service, the mechanic will check the belt and the tensioner for noise, oil leakages, cracks, splits, damaged edges, and other signs of wear. In most cases, it's easy to see when the belt is worn out. A worn-out belt and a noisy tensioner must be replaced. 


How Much Should I Pay For A New Drive Belt And Belt Tensioner?

A new drive belt and belt tensioner can be expensive depending on the vehicle you drive. You have an option to choose from a unique brand or the same brand if it suits your budget. The price range varies from one brand to the other. A new drive belt will cost you around $30 to $60, the labor cost is about $40 to $60. Replacing the belt tensioner will cost around $45-$155, for tensioner, and the labor would be around $40 to $75. It is easy to replace a drive belt as a DIY project, and save a lot of labor if you have the proper tools and knowledge.


What Are The Symptoms That My Drive Belt And Belt Tensioner Are Failing?

When there is an issue with the drive belt or the tensioner, it can affect the performance and functionality of the vehicle. A bad drive belt or failing tensioner will produce a few symptoms that can alert the driver of a potential problem.


Squeaking Or Grinding Noise

The most common symptom is noise from the belts or tensioners. If the tensioner is loose, the belts may squeak when the engine is started. It is also possible for the tensioner pulley or bearing to wear out, which can produce a grinding noise from the pulley.


Unusual Belt Wear

The other symptom with the drive belt tensioner is unusual belt wear. If the drive belt tensioner pulley has issues, it can cause wear on the belt. A bad tensioner pulley can cause fraying on the edges of the belt, and in the worst cases can even cause the belt to break.


Regular Wear And Tear

A new drive belt has a soft felt surface on the ribbed side, when the belt wears, the belt rubber hardens and cracks. A worn-out belt loses tension because of stretching. This causes the belt to slip from time to time.


Oil Leaks

Sometimes, there are engine oil leaks around the belt area, which causes the belt to get soaked in oil. Oil or coolant can damage the driving or timing belt fast. It is important to fix the oil leaks before installing a new belt.


Bad Spring Belt Tensioner

Proper pressure is necessary for any belt. Often an old spring belt tensioner seizes up or wears out and becomes weak. Without the proper pressure, a drive belt will start slipping. This will cause the belt to wear out faster. A drive belt that keeps slipping off the pulley is a symptom of a bad tensioner. The solution is to replace the drive belt and the belt tensioner.


Manual Belt Tension Is Out Of Adjustment

In many old cars, the belt tension is adjusted manually. Over time, the belt stretches and if the pressure is not adjusted, the belt will start slipping. If the belt is in good shape, the pressure should be readjusted. If the belt is damaged, it should be replaced and properly tightened.


Belt-driven Accessories Fail

Usually, a belt that has failed because of the tensioner will have to be replaced, along with the tensioner. Many of the engine’s accessories, such as the alternator, water pump, and A/C compressor, are belt-driven. A seized or loose tensioner can cause the drive belt to snap, which will disengage the accessories that can create problems such as a disabled A/C system, overheating, or a dead electrical system and battery.


Defective Hydraulic Belt Tensioner

Many cars have a hydraulic drive belt tensioner. The hydraulic belt tensioner can fail if it has an oil leak from the hydraulic shock absorber. The hydraulic tensioner can cause rattling noise from the belt area when it loses its oil. This can cause to reduce the tension applied to the belt. In this case, a defective tensioner must be replaced. The belt should also be replaced if it is soaked in oil.


Misaligned Belt Pulley

A drive belt runs on several pulleys. If any of the devices or a tensioner pulley is not lined up with the belt, the belt will squeal. This problem will create increased wear on one side of the belt. It is always necessary to check the alignment of the belt. All accessories should be checked for proper tightening.


Noisy Idler Pulley Or Tensioner Bearing

To route a drive belt, many cars use a free-spinning pulley. They are called the idler pulley. The idler pulley spins on a small bearing, When that bearing goes bad, it can create a whining or screeching noise. The tensioner also has a small bearing as the idler bearing and can have the same problem.


Cracks And Wear On The Belt

The driver should check the drive belt from time to time. Check for cracks, chunks missing, abrasions, rib separation, uneven rib wear, and damaged ribs. If you notice any of these, it is time to replace the drive belt.



Gates- Part Number Catalog

Category

Part Numbers

Serpentine Belts

K060866, K040465, K060494, K070852, K060480, K060771, K060738, K070443, K040336, K040360, K060448, K060930 

Air Conditioning Compressor Belts

7420, 9440, 9380, 9650, 7370, 7550, 7360, 7400, 7380, 9463, 9640, 7395

Alternator And Fan Belts 

7430, 9447, 7435, 7480, 7420, 9440, 9380, 9650, 7370, 7550, 7360, 7400

Engine Timing Belts

T296, T304, T295, T265, T224, T315, T286, T244, T228, T343, T307, T335

Belt Tensioners

T43096, T43217, T43010, T43097, T43175, T43131, T43194, T43178, T43039, T43190, T43130, T41005

Belt Tensioner Assembly

38285, 39071, 38382, 38485, 38332, 39053, 39390, 38284, 38323, 39282, 38329, 39120


Dayco- Part Number Catalog

Category

Part Numbers

Serpentine Belts

5060930, 5050835, 5040345, 5050475, 5050435, 5040385, 5040305, 5060950, 5040315, 5060410, 5050370, 5060825

Air Conditioning Compressor Belts

15385, 15530, 15565, 17525, 15325, 15460, 15360, 15555, 15595, 15505, 15355, 15540

Alternator And Fan Belts 

15445, 15510, 17420, 15385, 15565, 15530, 15460, 15435, 15325, 17525, 15540, 15290

Engine Timing Belts

95139, 95245, 95258, 95257, 95199, 95143, 95307, 95259, 95284, 95172, 95265, 95304

Belt Tensioners

85044, 85039, 85014, 85025, 85015, 85007, 85048, 85029, 85046, 85022, 85063, 85016

Belt Tensioner Assembly

89318, 89233, 89217, 89230, 89260, 89280, 89203, 89240, 89236, 89218, 89235, 89201



Bando USA- Part Number Catalog

Category

Part Numbers

Serpentine Belts

7PK1755, 6PK2300, 3PK850, 4PK1050, 6PK1175, 4PK1010, 4PK890, 6PK990, 3PK1200, 6PK1880, 5PK875, 4PK845


Transit Warehouse - Part Number Catalog

Category

Part Numbers

Serpentine Belts

KBR-5060740, KBR-5071013, KBR-5040350, KBR-5040335, KBR-5060770, KBR-5060605, KBR-5040320, KBR-5040378, KBR-5060865, KBR-5060875, KBR-5060450


Dorman/Techoice - Part Number Catalog

Category

Part Numbers

Belt Tensioner Assembly

419-100, 419-303, 419-125, 419-112, 419-318, 419-011, 419-014, 419-104, 419-007, 419-037, 419-201, 419-211

FAQ

It could be risky to drive with a bad belt tensioner because the belt tensioner keeps sufficient pressure to power the accessories. If the tensioner seizes, the belt can slip at the accessories, creating noise and can reduce accessory performance.

Proper tension is the key to a drive belt's performance, and a belt tensioner maintains that tension. This belt tensioner should be checked along with the drive belt and considered for service or replacement if found at fault.

Slipping can be due to a loss of belt tension or pulley misalignment. Due to the friction between the drive belt and accessory, drive pulleys cause the drive belt to overheat, which then causes the belt to slip off the pulley. If you hear a high-pitched squealing noise, you should get it checked by a professional mechanic.

Drive belt replacement is easy because today's automatic drive belt tensioner does not need to loosen bolts or pry(?can t be replaced with other word-investigate?) parts into position for tensioning. You just have to rotate the tensioner, remove the old belt and fit a new one.

John Framigllia
Technical Writer
Our technical writer is known for simplifying automotive parts and services. Intuitive with various vehicles and manufacturers, he knows how to simplify complicated problems.