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BMW Drive Belts & V-Belts for BMW 4 Series F32 (2014+)

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Your BMW's drive belts are wear items, and will degrade and crack over time. Don't wait until you have a belt failure... don't get stranded! Replacing your BMW's belts, such as the alternator belt, power steering belt, air conditioning AC belt, or serpentine belt is a low cost insurance policy to preventing a break down -- or worse, engine damage. We recommend checking your belts every 10,000 miles. If your belts have excessive cracks, dry rot, missing teeth and/or grooves, are cause noise, it's time for new ones.

While also inspecting your serpentine belts, also check for wear or resistance in the pulleys. The tensioner pulley and deflection pulley are the primary sources for belt squealing. The rubber-isolated pulleys can also break apart, leading to total belt failure. We sell the tensioner and deflection pulleys for the M50 engine family used in the E34, E36, E39, E46, X5, Z3, and Z4.

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Crank Seal Guard - N52/N54/N55/S55

T#:15876877

Part#: 049453LA01-02

In Stock

Sale - Save 25% $ 132.99

This product was last offered at the strikethrough price on
06-14-2026

$ 99.99 USD

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Sale - Save 25%

$ 132.99

This product was last offered at the strikethrough price on
06-14-2026

$ 99.99 USD

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Introducing our Turner Motorsport Crank Seal Guard – the essential shield for your BMW's engine integrity. Safeguarding the heart of your vehicle, this meticulously designed guard offers robust protection for the crank seal concealed behind the harmonic balancer.

Considered an indispensable maintenance component for your BMW, the Crank Seal Guard acts as a crucial defense against a potential and preventable catastrophe involving your accessory belt. Facing the reality of potential oil or coolant leaks in your engine, this guard becomes a reliable barrier, preventing these fluids from reaching the accessory belt. The consequence of a compromised belt includes walking, slipping, fraying, and rubber particles finding their way behind the harmonic balancer and into the crank seal – a scenario that can lead to severe engine failure.

Let's be honest, engine leaks are a common occurrence, and whether your engine is currently leaking or not, the Crank Seal Guard is a proactive measure against future threats. The wear and tear on the accessory belt due to oil and coolant exposure can result in slipping, tearing, or, worst-case scenario, belt snapping – posing a significant risk to your engine's well-being.

Prepare your car for the long haul and protect the vital components, It's not a matter of "if" but "when" your belt will become a problem, and our Crank Seal Guard is your proactive solution. Rigorously tested on N52/N54/N55 and S55 for 100% confirmed fitment, it stands as a reliable guardian for your engine's health. Invest in the protection your BMW deserves with the Turner Motorsport Crank Seal Guard.

Key benefits:

Protect crank seal from rogue accessory belts and their shredded debris
Optimized to fit N52, N54, N55, and S55 engines
Rigid design that fits within the space constraints between the engine block and harmonic balancer
Zinc-coated fasteners for corrosion and oxidation resistance
Design:

Modeled and designed from FARO laser scanning and Solidworks CAD
Manufactured from 6061 billet aluminum
Turner blue anodizing
Installation:

It is a good idea to note how your belt is routed before starting the installation.

2 securing bolts for crank seal guard - Torque value of 20Nm

You will find either 6 or 8 E10 bolts are holding the harmonic balancer depending on the engine.

E10 (P#11237564511)
N52: 6 bolts - Torque value of 25nm
N54: 6 bolts - Torque value of 35nm
N55: 8 bolts - Torque value of 35nm

E10 (P#11237575488)
S55: 8 Bolts - Torque value of 35nm

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OEM Accessory Belt Service Kit - F3X F22/23 N55 3.0L

T#:587391

Part#: 11287628661ABKT

In Stock

$ 171.99

This product was last offered at the strikethrough price on
06-09-2026

$ 153.99 USD

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$ 153.99 USD

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This kit includes the basic components recommended to replace when it comes time to swap out your accessory belt.

Accessory Belt Service Kit w/ Kevlar Reinforced Belt - BMW N55 F-Chas...

T#:22097553

Part#: 11287628661TKT

In Stock

Sale - Save 23% $ 131.99

This product was last offered at the strikethrough price on
06-16-2026

$ 101.98 USD

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Sale - Save 23%

$ 131.99

This product was last offered at the strikethrough price on
06-16-2026

$ 101.98 USD

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Eliminate your squeaking accessory belt pulley and cracked drive belt with this upgraded accessory belt service kit! This kit includes the ECS Kevlar Reinforced Drive Belt, tensioner assembly, and idler pulley. ECS Tuning's Red Kevlar Accessory Belts are both an aesthetic improvement and a performance alternative to a traditional belt. Kevlar-reinforced belts experience less elongation over time minimizing the amount of belt adjustment needed as well as offering a higher shock and impact resistance compared to OEM-style belts. Refreshing the rollers and/or tensioners simultaneously is a great way to ensure all vital components of your drive belt system are functioning optimally for years to come!

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OEM Accessory Belt Service Kit - F3X F10 N20 2.0L

T#:587390

Part#: 11287594969ABKT

In Stock

Sale - Save 29% $ 89.15

This product was last offered at the strikethrough price on
06-29-2026

$ 62.94 USD

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Qty

Sale - Save 29%

$ 89.15

This product was last offered at the strikethrough price on
06-29-2026

$ 62.94 USD

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This kit includes the basic components recommended to replace when it comes time to swap out your accessory belt.

Accessory Belt Service Kit w/ Kevlar Reinforced Belt - F3X F10 N20 2....

T#:22097555

Part#: 11287618848TKT

In Stock

Sale - Save 34% $ 106.99

This product was last offered at the strikethrough price on
06-01-2026

$ 70.48 USD

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Qty

Sale - Save 34%

$ 106.99

This product was last offered at the strikethrough price on
06-01-2026

$ 70.48 USD

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Eliminate your squeaking accessory belt pulley and cracked drive belt with this upgraded accessory belt service kit! This kit includes the ECS Kevlar Reinforced Drive Belt and an OEM tensioner assembly. ECS Tuning's Red Kevlar Accessory Belts are both an aesthetic improvement and a performance alternative to a traditional belt. Kevlar-reinforced belts experience less elongation over time minimizing the amount of belt adjustment needed as well as offering a higher shock and impact resistance compared to OEM-style belts. Refreshing the tensioner and upgrading your accessory belt is a great way to ensure all vital components of your drive belt system are functioning optimally for years to come!

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Accessory Belt Service Kit w/ Kevlar Reinforced Belt - F22/23 F3X B58...

T#:22097533

Part#: 11288613707TKT

Ships on Oct 27, 2026

Sale - Save 24% $ 137.99

This product was last offered at the strikethrough price on
05-03-2026

$ 105.35 USD

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Qty

Sale - Save 24%

$ 137.99

This product was last offered at the strikethrough price on
05-03-2026

$ 105.35 USD

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Eliminate your squeaking accessory belt pulley and cracked drive belt with this upgraded accessory belt service kit! This kit includes the ECS Kevlar Reinforced Drive Belt, tensioner assembly, and the hardware required to install the new tensioner. ECS Tuning's Red Kevlar Accessory Belts are both an aesthetic improvement and a performance alternative to a traditional belt. Kevlar-reinforced belts experience less elongation over time minimizing the amount of belt adjustment needed as well as offering a higher shock and impact resistance compared to OEM-style belts. Refreshing the rollers and/or tensioners simultaneously is a great way to ensure all vital components of your drive belt system are functioning optimally for years to come!

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OEM Accessory Belt Service Kit - B46/48 B58

T#:587399

Part#: 112886137071ABKT

Back Ordered

Sale - Save 18% $ 121.99

This product was last offered at the strikethrough price on
05-03-2026

$ 99.57 USD

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Sale - Save 18%

$ 121.99

This product was last offered at the strikethrough price on
05-03-2026

$ 99.57 USD

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Over time, accessory belts begin to wear out and crack. This can lead to the belt slipping, squeaking, or even snapping. Replace your belts and tensioners on a regular basis to ensure you don't end up stranded on the side of the road with a dead battery or overheated engine due to a bit of simple overlooked maintenance. This kit includes all of the items that will need to be replaced such as the belts, tensioners, and hardware.

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N55 "Bulletproof" Crank Hub & Serpentine Kit - BMW F22/23 F3X N55 3.0...

T#:1241398

Part#: TMSF30N55BPKT

In Stock

Sale - Save 6% $ 520.99

This product was last offered at the strikethrough price on
05-03-2026

$ 491.62 USD

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Sale - Save 6%

$ 520.99

This product was last offered at the strikethrough price on
05-03-2026

$ 491.62 USD

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BMW has a seemingly endless number of fans of the N54/N55/S55 engines, three straight-six turbo engines that are each capable of 750+ horsepower, but that doesn't mean they were without their faults! BMW's N54 had a notoriously rocky start with reliability due to multiple issues such as fuel injectors failing, turbos failing, serpentine belt failure, crank hubs coming loose, and more... BMW made multiple attempts to fix the issues plaguing the N54, but they could only do so much and the fixes rolled out seemed temporary at best. Following the N54, BMW released their updated N55 and S55 engines, giving many people hope that these engines would address the previous issues. Unfortunately, this was only some-what the case. Crank hubs and crank bolts continued to loosen over time and serpentine belts continued to shred themselves and get pulled into the oil pan through the front main seal. For all three engines, this meant a single failure could effectively turn your engine into an oversized paperweight. Luckily for us, the BMW community is full of skilled enthusiasts who have gladly taken up the task to offer solutions! The first headache to be addressed was the Crank Hub and Bolt. Using a simple plate that fits perfectly over your crank hub's hex-head bolt and mounts up against the damper, the crank bolt is effectively locked in place, preventing it from being able to back out until the plate is fully removed. Next up was the serpentine belt failures. It's not known what exactly causes the serpentine belt to split, but once it does, the pieces hanging off of the belt wrap around and behind the damper. This leads to the belt breaking up into smaller pieces and eventually getting pushed between the crank hub and rear main seal into the oil pan. These small pieces of debris get caught in and block the oil pickup, preventing oil flow and leading to engine failure. To prevent this, multiple aftermarket companies came up with their own versions of Crank Seal Plates. This plate is installed behind the front damper, blocking the opening that allows the serpentine belt to pass between the crank hub and seal, keeping debris out of your oil pan! Also included in this kit are the components to service your front Oil Cooler/Filter Housing gaskets, refresh your drive belt system, and install the aftermarket upgrades. Kit Features and Contents: Vargas Turbo Crank Bolt Capture Vargas Turbo Crank Seal Plate ECS Kevlar reinforced accessory belt OEM Belt Tensioner & Idler Pullies Liqui-Moly Longtime High Tech Engine Oil (5w-30) - 7 Liters OEM Hengst Oil Filter OEM Oil Filter/Cooler Housing Gaskets TMS Oil Change Sticker Genuine BMW Full-Strength Coolant - 1 Liter

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Accessory Belt Service Kit - F3X F2X B46/B48

T#:30430718

Part#: 11288646475KT2

In Stock at Vendor

Sale - Save 19% $ 130.99

This product was last offered at the strikethrough price on
05-03-2026

$ 105.75 USD

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Qty

Sale - Save 19%

$ 130.99

This product was last offered at the strikethrough price on
05-03-2026

$ 105.75 USD

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Don't let an accessory belt failure leave you stranded! Over time, the tensioner and belt wear out, risking your alternator's ability to charge and your vehicle's overall reliability. Turner Motorsport has assembled a comprehensive belt drive service kit to keep everything in check and ensure smooth operation.

Key Benefits:

Complete Service Kit: Includes all necessary components to maintain your belt drive system. Enhanced Reliability: Prevents unexpected belt failures and keeps your vehicle running smoothly. Optimized Performance: Ensures your alternator and A/C system function efficiently. Kit Contents:

Accessory Belt Belt Tensioner Assembly A/C Belt Maintain your BMW's performance and reliability with the Turner Motorsport drive belt service kit!

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Vaico Mechanical Accessory Belt Tensioner - BMW B46/48 B58

T#:50346424

Part#: 11288580360

Special Order: No Guaranteed ETA

$ 68.99 USD

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$ 68.99 USD

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Accessory belt tensioners provide tension to the belt drive system, ensuring the belt is able to properly turn engine accessories without slipping. If your tensioner has failed, replace it with a brand-new unit to ensure proper water pump and alternator functionality.

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