Replace an overrunning Alternator Decoupler Pulley? (Suits you)

  • 1) Secure the alternator in a vise Replace alternator decoupler pulley 2) Use a screwdriver to remove the plastic cap. You cannot reuse the cap once you’ve removed it.

What is 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 do I know if my alternator decoupler pulley is bad?

Look for signs of grease around the pulley indicating a bad seal. If you can get a view inside the alternator, the rotor should continue to spin down when you shut off the engine. If the charging system warning indicator is on, the OAD may be the culprit, not necessarily the alternator.

What is overrunning alternator pulley?

The overrunning alternator pulley is a further development of the fixed belt pulley on the alternator. Thanks to its overrunning clutch, it damps the vibrations which are generated by cyclic irregularities in the crankshaft and also enables the engine speed to be reduced rapidly in the event of sudden load changes.

How do I check my overrunning alternator pulley?

Rev up the engine to approximately 2000-2500 revolutions per minute (rpm). Then shut it off and listen for a buzzing sound coming from the alternator. If you hear a short buzzing sound (1 to 5 seconds), the pulley’s bearing may have worn out and the overrunning alternator pulley may require replacement.

What is an alternator clutch pulley?

This type of clutch pulley allows the alternator rotor to coast to a stop when shutting down the engine or any other time the engine rpm decelerates quickly (transmission shifting). Its first job is transferring torque from the engine to the alternator via the belt.

What is a decoupler?

(diːˈkʌplə) noun. a person or device that disconnects parts that are joined.

How much does it cost to fix 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.

What happens when alternator pulley goes bad?

An alternator pulley is not so simple anymore. If the internal clutch mechanism is bad, the pulley may slip and fail to drive the alternator, or it may remain locked all the time – increasing noise, vibration and stress on the belt drive system.

What causes alternator pulley to go bad?

Pulleys do go bad because the grease in the pulley bearing dries out, the ball bearings and bearing races get pitted and then the pulley becomes noisy. Sometimes, the pulley will actually seize. However, it will be EASILY evident if a pulley bearing is bad. So, all you need to do is have them PROVE the failure to you.

What sound does a bad alternator pulley make?

A common sound made by failing alternators is a very high pitched whining noise that you’ll hear when the engine is running. When the RMPs increase, such as when you accelerate, you’ll hear the noise get higher in pitch as the pulley spins faster.

Replace an overrunning Alternator Decoupler Pulley

When you purchase an extended warranty, you may be under the misconception that your goods is covered from the moment you walk out the door. In the vast majority of situations (perhaps all), this is not the case. Consider this: your product is covered by a valid manufacturer’s warranty. Why would any sensible store want to override that with their own warranty? They wouldn’t do it. Your extended warranty will not become effective until the manufacturer’s warranty has expired. This is a dirty little secret in many designs, but that is the way the system is designed to function.

It’s really likely.

As a result, the three-year warranty you paid for (and calculated the cost of) is more than likely only worth an additional two years of coverage.

Also interesting: Replace an overrunning Alternator Decoupler Pulley? (Suits you)

That’s where the OAD comes into play

The pulley for the OAD is constructed with an internal spring and clutch. An Overrunning Alternator Decoupler Pulley (GATES) is depicted in this picture to absorb part of the force associated with belt tension application and release, as seen in the diagram. In the case of quick deceleration, the OAD allows the alternator’s rotor to free-wheel rather than creating friction between it and the drive belt. Consequently, when you drive, the OAD is continually absorbing speed increases and deceleration decreases.

An OAD is also referred to as an Alternator Decoupler Pulley by some manufacturers (ADP).

While an Overrunning Alternator Pulley (OAP) is a one-way clutch that allows the alternator’s rotor to free-wheel during deceleration, it is not the same as a conventional alternator.

However, while all of these technologies allow the alternator to free-wheel when necessary, only an OAD Decoupler Pulley is equipped with the internal spring mechanism essential to absorb vibration induced by decreasing belt tension during operation.

Overrunning Alternator Decoupler Pulleys Wear Out

The early OAD designs had a very low life span of about 40 to 60,000 kilometers, which was considered to be inadequate.

Later versions, on the other hand, can easily go 100,000 miles before needing to be replaced. You do not have to replace the complete alternator merely to replace the OAD or OAP. You may simply replace the OAD or OAP. However, specific tools, such as those described below, are required.

Replace your OAD

Because OAD pulleys wear out and require specific tools to replace, you may be tempted to install anOAD toolsOAP or ADP design or to replace the pulley with a fixed pulley instead. Please don’t do that. These engines, as well as the belt tensioners, were built specifically for OAD pulleys, and substituting an other type of pulley might cause damage to the belt, tensioner, and even the engine. It is recommended that you replace the belt, the tensioner, and the OAD at the same time because late model cars are also equipped with an EDPM type extended life belt that has a life expectancy of over 100,000 miles.

  1. 1) Place the alternator in a vice and secure it there.
  2. 2)Remove the plastic cap by prying it off using a screwdriver.
  3. The removal tool should be installed in the hex slot and then the pulley should be removed by using the proper socket and wrench.
  4. Tighten to the specifications of the manufacturer.

Alternator Pulley Evolution

Initial equipment manufacturers (OEMs) began using solid serpentine alternator pulleys and automatic belt tensioners in 1979, and they were the first to do so. Their main function was to convey power to the alternator using a single belt and tensioner, thereby removing the requirement for several V-Belts inside the Accessory Belt Drive System, which was previously in use (ABDS). Pulley for the alternator that is solid OEs have continued to improve alternator pulley technology since then, with the advent of One-Way Clutch (OWC) Pulleys and Overrunning Alternator Decoupler (OAD) Pulleys, among other innovations.

The first OWCs were utilized in 1997, while the first OADs were used in 1999.

Types of Alternator Pulleys

Because OADs allow for lower system tension, the alternator, water pump, and other accessory bearings will have a significantly longer life span.

The Solid Alternator Pulley solid pulley’ data-medium-file=’ data-large-file=’ loading=’lazy’ src=’ alt=’Solid Alternator Pulley’ width=’176′ height=’159′ data-lazy-src=’ srcset=’data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7’>

It used to be the industry standard and had been in use for many years before being phased out. A transition has occurred from the V type to the V-ribbed type (serpentine belt). Its sole function is to drive the alternator by the use of a belt. Replacement of a solid pulley alternator is only necessary if the pulley is broken, rusty, or worn.

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One-Way Clutch

One-Way Clutch Alternator Pulley’ data-medium-file=’ data-large-file=’ loading=’lazy’ src=’ alt=’One-Way Clutch Alternator Pulley’ data-large-file=’ loading=’lazy’ src=’ alt=’One-Way Clutch Alternator Pulley’ data-medium-file=’ data-large-file=’ loading=’lazy’ src=’ alt=’ The width and height of the image are 175′ and 175′ respectively. data-lazy-src=’ srcset=’ data-lazy-src=’ data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7’> The pulley is equipped with a straightforward one-way clutch.

When the engine is turned off, this internal clutch permits the rotor of the alternator to coast to a complete stop. It is possible to disable the ‘chirp’ sound that occurs when the engine decelerates abruptly, causing the belt to slide (engine shut down or transmission shifting).

The Overrunning Alternator Decoupler Pulley (OAD)

Overrunning Alternator Decoupler Pulley (OAD)’ data-medium-file=’ data-large-file=’ loading=’lazy’ src=’ alt=’Overrunning Alternator Decoupler Pulley (OAD)’ width=’174′ height=’161′ data-large-file=’ loading=’lazy’ src=’ alt=’Overrunning Alternator Decoupler Pulley (OAD)’ width=’174′ height=’161′ data-lazy-src=’ srcset=’ data-lazy-src=’ data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7’> Not only does it have a one-way clutch within, but it also contains a torsion spring to absorb the energy generated.

Its effects are identical to those described above; nevertheless, the OAD’s unique patented internal torsion spring design is essential in achieving the significantly greater degree of performance associated with the OAD.

Installing the OAD results in significantly decreased tensioner motion, reduced noise, vibration and harshness, and an all-around more durable accessory drive in comparison to a standard accessory drive.

Reduced performance and difficulties with the Accessory Belt Drive System, including the imminent and early failure of the Serpentine Belt and Tensioner, will result from downgrading the drive system.

Overrunning Alternator Decoupler Pulley’ data-medium-file=’ data-large-file=’ loading=’lazy’ src=’ alt=’Overrunning Alternator Decoupler Pulley’ data-large-file=’ loading=’lazy’ src=’ alt=’Overrunning Alternator Decoupler Pulley’ data-medium-file=’ data-large-file=’ loading=’lazy’ src=’ alt=’Overrunning Alternator Decoupler Pulley’ data width=’800′ height=’564′ width=’800′ height=’564′ data-lazy-src=’ srcset=’data:image/gif;base64,R0lGODlhAQABAIAAAAAP/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7/yH5BAEAAAAALAAAAAABAAEAAAIBRA ‘> The following is an example of a formalized formalized formalized Check out all of the electrical system goods available on NAPA Online or bring your vehicle to one of our 17,000 NAPA AutoCare facilities for routine maintenance and repair.

Contact a trained specialist at your local NAPA AUTO PARTS shop for additional information on the alternator pulley in your vehicle.

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Over ninety years ago, the National Automotive Parts Association (‘NAPA’) was established to fulfill the rising demand for an efficient auto parts distribution system in the United States of America.

In today’s market, the NAPA brand is recognized by 91 percent of do-it-yourself clients. We have over 6,000 NAPA AUTO PARTS Stores around the country, covering all 50 states, each with a unique inventory control system that assists you in finding the exact component that you want.

Avoiding Alternator Comebacks: Did Your Supplier Provide the Right Pulley?

Overrunning alternator decoupler (OAD) pulleys for late-model vehicles are becoming increasingly common, and automotive repair shops who install remanufactured alternators are being advised to ensure that their units are equipped with this modern technology. Overrunning alternator decoupler (OAD) pulleys for late-model vehicles are becoming increasingly common, and automotive repair shops who install remanufactured alternators are being advised to ensure that their units are equipped with this modern technology.

  • More information is available by clicking here.
  • In addition, the alternator may ‘coast’ easily in the event of a rapid belt deceleration thanks to these clever pulleys.
  • It is possible that the usage of either of these components in an OAD application will result in significant belt vibration and premature wear of other components in the belt drive system.
  • Litens suggests that vehicle repair shops double-check with their alternator suppliers to ensure that authentic OAD decoupler pulleys are included on all of their related alternator models.
  • A variety of aftermarket suppliers, including top national alternator and belt manufacturers and distributors, are now offering genuine OAD decoupler pulleys for sale.

Overrunning alternator pulley improves internal combustion engine

When it comes to the smooth operation of a modern internal combustion (IC) engine, an overrunning alternator pulley (OAP) can make a significant contribution. However, despite the fact that it can have a favorable impact on energy efficiency, it is frequently neglected by design engineers. The OAP’s job is to disconnect the alternator from rotational anomalies, which might cause damage. In particular, because the rotational abnormalities that can occur in IC engines, especially those with turbochargers, can be substantially higher than the rotational irregularities represented by the tachometer needle, this function is crucial.

  1. Thus, the acceleration and deceleration forces exerted on the alternator as a result of rotational irregularities have the largest impact on the belt’s performance.
  2. The advantage of using an OAP in conjunction with a one-way clutch is that the level of force in the belt drive is reduced.
  3. In addition, the engine runs more smoothly as a result of this.
  4. In urban traffic situations, when a substantial amount of the time is spent idling and accelerating, a belt drive with an overrunning pulley is subjected to much lower stresses than a belt drive without an overrunning pulley, resulting in significantly cheaper operating costs.

Schaeffler Automotive’s Volker Ploetz, senior manager of transmission components, has the following to say: ‘A similar mechanism to that of a bicycle pedal’s freewheeling is employed by the overrunning alternator pulley, in which only the acceleration proportion of the crankshaft’s rotational irregularities is used to drive the alternator.

A decrease in tensioning forces and lengths is also achieved, as is an improvement in noise behavior, a reduction in belt width, and an increase in system lifetime.

In terms of installation, the overrunning alternator pulley is simple to install because it does not require any additional fasteners.’ That the OAP makes such a significant contribution to improving energy efficiency also explains why it has been so effectively incorporated into both diesel and petrol engines.

  1. It is currently included in a comprehensive list of actions aimed at reducing the fuel consumption of internal combustion engines, which is being developed.
  2. The OAP made a significant contribution to a decrease in fuel usage of about 1 percent in this location.
  3. Robert Plank, vice president of corporate engineering, has the following to say: ‘When applied to a system that is near to volume production requirements, CO2ncept-10 percent demonstrates outstanding proof of the further possibilities for optimization.
  4. An OAP, which was built partly to aircraft specs and is utilized in the Schaeffler Audi A4 DTM, which competes in the German touring car championship, is also included in this group.
  5. Design of structural elements The overrunning alternator pulley is made up of a pulley with an outer diameter that is suited for use with a poly-V belt, a one-way clutch unit with bearing supports, an inner ring, and two seals that are mounted on the outside of the pulley.
  6. The development of a modular system for overrunning alternator pulleys has been undertaken in order to give an affordable and adaptable answer for client inquiries.
  7. The frequency of an overrunning alternator pulley is not the same as that of spring decouplers, and it does not need to be changed for different alternator diameters, as is the case with spring decouplers.
  8. Its purpose is to disconnect the generator from the rotational irregularity of an internal combustion engine’s crankshaft, which is caused by the overrunning alternator pulley.
  9. As a result, there are discrepancies in the rotation angle speeds of the crankshaft and the alternator.
  10. A decoupling device separates the alternator mass and its affects from the accessory drive.

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Alternator Pulley Diagnostics

Are you changing alternators that don’t need to be replaced? Don’t instinctively assume that the problem is inside the alternator and that it is thus unserviceable when confronted with an illuminated charge light diagnosis on the majority of late-model automobiles. It’s possible that the problem is with the pulley and belt drive system. Failure to properly test and diagnose the pulley may result in the need for an unneeded replacement. More information is available by clicking here. Most late model automobiles and trucks are fitted with an overrunning alternator pulley (OAP) or an overrunning alternator decoupler (ORAD) (OAD).

  • An OAD functions in the same way as a normal drive belt, but it contains a specific clutch and spring that absorb vibration in order to smooth down vibrations in the drive belt system, as opposed to a normal drive belt.
  • As a result of the redesigned pulleys, the alternator can ‘freewheel’ or ‘overrun’ in the event that the belt abruptly slows down.
  • The best part is that the method requires less tension, allowing for the use of a smaller belt.
  • However, because of the way these pulleys function on the inside, they have a limited service life.
  • Testing can be carried out on the vehicle while the belt is fastened to it.
  • Increase the engine speed to 2,000-2,500 revs while in Park (automatic transmission) or Neutral (manual transmission) and then turn off the engine.
  • The presence of a worn-out bearing will result in a ‘buzz’ sound during this test.
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Smoothness in the overrun direction and springiness in the drive direction should be felt in the driving direction.

If the OAD does not have any spring feel in the driving direction, it should be replaced.

(1-1.5 Nm) of torque to turn in the overrun direction.

The following image is courtesy of Litens Automotive Group:

Alternator Pulley

Many late-model automobiles are fitted with specific pulleys that are designed to minimize NVH (noise, vibration, and harshness) while also extending the life of the alternator and other components. More information is available by clicking here. An alternator pulley is no longer as straightforward as it once was. Many late-model automobiles are fitted with specific pulleys that are designed to minimize NVH (noise, vibration, and harshness) while also extending the life of the alternator and other components.

  1. When a proper OAP pulley is spun in one direction, it should lock up and turn the alternator rotor, but it should release and free-wheel when the pulley is spun in the opposite direction.
  2. An Overrunning Alternator Decoupler is another form of customized pulley that may be used (OAD).
  3. The spring works as a shock absorber, allowing the hub to be cushioned.
  4. Because of a malfunctioning clutch or spring inside the pulley, the pulley may be unable to drive the alternator, or it may cause vibrations and noise when driving.
  5. In most cases, the OAP and OAD pulleys thread on to the alternator shaft.
  6. Some replacement alternators are sent with new pulleys already mounted, but others are delivered without them.
  7. The original pulley from the old alternator must be in good condition in order to be reused on the new alternator.

Is it possible for a replacement alternator to be fitted with a different type of pulley than the original one?

As a result, noise, vibration, and harshness (NVH) will most likely be considerably increased when driving.

This can result in damage or distortion of the pulley, as well as damage to the shaft bearings.

If you want to install a press-fit pulley, you should use a hydraulic press.

Proper drive belt tension is also essential for any sort of alternator pulley, regardless of the brand.

A tensioner that spins easily and has adequate spring tension is required for proper tension.

In addition, the tensioner pivot bushing might get worn or stuck.

The same may be said for the belt.

Using a belt-wear gauge, you may evaluate the depth of ribbing on the underneath of the belt, which will indicate how much wear has occurred.

Belts that are replaced must be the same length and breadth as the original belts were.

Uneven strain and squealing will result from a belt that is too long, while a belt that is too short may not fit at all and may overload the shaft bearings on the alternator, water pump, air conditioner compressor, and power steering pump (PS pump).

Overrunning Alternator Decoupler (OAD) Pulley Mod

This is a straightforward modification that involves replacing the factory alternator pulley with a newer overrunning, decoupling kind. Because they are used in nearly all new automobiles, the benefits must be significant. The user ‘Bitter’ from deserves all of the credit for the research and work that went into this mod. His test car is a GT-S with an automatic transmission. I’ve also placed one of these pulleys in my Spyder, which is a great addition. And I’m pleased to report that the change is pretty noticeable today.

The following information is taken from the original thread: Allowing the alternator to freewheel while not in use extends the life of the belt and tensioner, improves engine economy, and, most importantly, decreases spinning mass when the engine is decelerating, all of which are highly helpful.

  • It takes a significant amount of energy to slow down each time you wish to shift gears.
  • I have no clue whether or not it would make a significant impact, but because they are used in every new car, there must be some advantage to balance the cost and enough for the bean counters throughout the industry to justify the expense.
  • The alternator will be decoupled from the engine during acceleration and deceleration since it is overrunning and decoupling, which in principle should minimize wear on the belt and lower the spinning mass of the engine under certain situations.
  • That Dayco component number is a perfect match for the original pulley and has the same belt size as the old one.
  • Bitter’s first impressions of the month of April were as follows: There is a significant improvement in smoothness while shifting at high RPM, whether up or down shift, and a significant reduction in ‘kick’ when up shifting at high RPM.
  • The majority of that kick has been eliminated, and I actually prefer the way it feels now because it feels faster because it feels smoother.
  • As a result, I believe it is functional, with perhaps a greater effect when using a manual transmission, and I will update when/if it fails, something changes, or I learn anything new.

Shifting at a high RPM is significantly smoother.


The fact that the rotating mass of the alternator itself has been separated from the pulley system represents a significant benefit.

The ECU still has to be retrained in terms of fuelling.

So far, the voltage has remained continuously over 14.2 volts.

Update: Almost every shift feels excellent right now.

TL;DR: Bitter and I have arrived to the same conclusion about the consequences of our actions.

The powertrain has a lighter and more responsive feel to it when you apply the throttle.

This is a direct bolt-on replacement; the pulley has the same diameter as the original and is compatible with the original belt.

Pulley DAYCO 892003 or a comparable model Allen socket with a 17mm diameter With blue locktite, make an impact.

5/16/20 Update: This has been functioning beautifully on my Spyder since I installed it.

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1ZZ pulleys are either 52.5mm or 55mm in diameter; it may be worthwhile to measure yours before searching for the appropriate OAD type pulley.

M14x1.5 threads are used for all of them.

For the threads, blue locktite is highly suggested.

There are more pulley sizes, part numbers, an explanation of how OAD pullies function, and other information throughout the discussion. Carpe Viam! (Behold the Victory) Quote Getting the Conversation Started Posted at 11:07 p.m. on August 19, 2019

What does OAP Mean? Alternator Pulley Explained! • Blog

When it comes to your auxiliary belt system, the alternator pulley is a fascinating but sometimes ignored component. It may appear to be the same as a standard pulley, but it is not. Alternators play a significant role in the operation of a contemporary engine. Nonetheless, the mere nature of how they function might provide some difficulties. That’s why a group of engineers collaborated to develop analternator pulley that avoids these issues while yet allowing the auxiliary belt to do its function unhindered.

How do Alternator Pulleys Work?

Alternators are essential to the operation of contemporary automobiles. The alternator provides power to every piece of technology in a contemporary automobile that is powered by electrical. Alternators operate in a rather straightforward manner. In order to initiate the combustion process, the engine makes use of a battery to store enough electricity to turn it on. Afterwards, the engine drives the alternator, which in turn drives all of the electronics in the vehicle through the use of the auxiliary belt.

Because an alternator is basically a power generator that uses the motion of the belt to power different components in the automobile, the pulley is an integral component of this system.

Solid pulleys, on the other hand, were no longer sufficient as engines and alternators got more fragile over time.

Accessory drive belt (6K 2415) is a belt that is used for an accessory drive (Short Belt) Now is the time to shop.

Overrunning Alternator Pulleys

When the engine’s revolutions per minute dropped suddenly, the vibrations occurred because the engine’s RPM didn’t correspond to the rates at which a solid alternator pulley rotated. The turbulence or kickback caused by the quick shift in RPM might cause damage to the auxiliary belt. It is possible to solve this problem by the use of overrunningalternator pulleys (also known as OAPs). An OAPis a type of pulley that incorporates a built-in clutch into its design. With that function enabled, every time the engine’s revolutions per minute (RPM) reduced, the clutch would detach the alternator from the pulley, allowing the pulley to rotate freely.

Different Types of Overrunning Alternator Pulleys

In general, there are two varieties of overrunning alternator pulleys: OWCs and OADs. OWCs are the more common variety. The one-way clutch pulleys from OWCor are capable of spinning in one direction, but they completely lock up when you attempt to spin them in the other direction. In contrast, OADs (overrunning alternator decouplers) allow for some rotation in the opposite direction. (See illustration.)

How to Tell If your Alternator Has an OAP?

It is straightforward to determine if your alternator is equipped with an OAP or a solid pulley.

All that is required is a close examination of the pulley itself. A pulley is considered an OAP if it has a plastic cap covering the internal parts of the pulley. That lid is meant to keep debris and filth from getting into the sophisticated clutch mechanism that is housed inside the transmission.

Symptoms of a Failed Overrunning Alternator Pulley

You increase the quantity of items that can fail in a mechanical system every time you make it more complicated. It is rather simple to identify the signs of old age in older people. When the OAP fails, the clutch system is most often the cause of the failure. Once the clutch is broken, it remains locked in place, thus converting an overrunning alternator pulley into a good old solid pulley in the process. It’s probable that you may encounter accessory belt vibrations and a variety of other noises originating from the failing pulley if you are using an engine that is not built to function with an OAP.

New Pulley or New Alternator?

When the OAP fails, stopping the alternator from functioning, some individuals may believe that the alternator as a whole is no longer functional. There are a lot of decent alternators lying on a shelf someplace because their owners decided to replace the entire device rather than just the oxidation protection component. It’s a fact that changing the OAP requires specialized tools, which are rarely available unless the OAP is serviced on a regular basis. These instruments are frequently available for rent in your local area, which is convenient.

How to Test the OAP Without Taking the Alternator Off the Car?

Consequently, if the OAP fails and the alternator is unable to function, it is possible that the entire alternator has failed. The fact that their owners changed the entire device rather than just the OAP means that there are lots of decent alternators hanging around someplace. Honestly, changing the OAP takes specific tools that are rarely available unless the OAP is serviced on a regular basis by a qualified professional. These tools are frequently available for rent in your local area, which is convenient.

Where to Find Quality OAPs for your Alternator?

If you find yourself in the position of needing to replace your OAP, make sure to choose a high-quality replacement component. Genuine and OEM overrunning alternator pulleys for European automobiles are available from us in a wide variety of high-quality models. To find out which of these is compatible with your vehicle, simply visit our online shop and enter the specifics of your vehicle into our search engine. Alternatively (and with no disrespect intended), you may use ourVINtool. When you search for components using your vehicle’s VIN, you will receive significantly more accurate results.

If you have any concerns about our OAPs or any of the other goods in our catalog, please do not hesitate to contact our customer service department.

Our customer service representatives are standing by to provide you with whatever assistance you require.

Alternator Decoupler?

No, you should use the alternator that was developed specifically for the engine in question. Historically, when you drove your vehicle into a huge puddle, the alternator pulley would get thrown. This was a problem for the Gen 3 and early Gen 4 3,3, and3.8 equipped automobiles since the belt would get tossed. The remedy at the time was to replace the tensioner with one that had grooves on both sides, as well as the belt with grooves on both sides of it. Decoupler pulley, which was invented by Audi to lessen stress on the belt, so theoretically increasing the life of belt driven components, was adopted by Chrysler engineers because it solved the problem of belts being flung out of the car’s drivetrain.

I don’t see the point of include one in situations when it isn’t necessary.

Having a straight pulley on my Gen 3 3.3 would allow me to leave it in place, and if Chrysler hadn’t already done so, I’d purchase this Gates kit and let my alternator serve out the remainder of its useful life in this configuration.

Because none of the Gen 5 Pentastar vans are equipped with the decoupler pulley, they would continue to utilize them even if there was another reason to do so other than to fix that specific problem.

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