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This is an OEM INA tensioner pulley, also known as the adjusting pulley and lower pulley. This pulley is mounted on the belt tensioner near the center of the belt assembly. The upper and lower pulleys are known to be the primary sources for 'belt squealing'. This pulley is also encased in rubber which will crack over time. If left without service the rubber could fail completely, chucking the belt and leaving you stranded. Replacement is a very simple procedure and can be done anytime the fan is off the engine (belt replacement, water pump service, alternator replacement, etc).
This pulley is mounted along with the hydraulic belt tensioner but can be replaced on its own. It is used for the main drive belt on the M50-M54 family engines (M50, M50TU, M52, S52, M52TU, M54, M56, and S54 engines). This is the same belt that covers the water pump/alternator/power steering systems. Replacement is a very easy procedure (requires fan removal) and will have your engine purring in no time. Belt replacement is strongly recommended at the same time. If you have a mechanical belt tensioner, the pulley can only be replaced with a new tensioner.
OEM Schaeffler (INA, LuK, & FAG) is an engineering company that focuses on high-performance, precision manufacturing. With their individual brands INA, Luk, and FAG providing exceptionally high quality parts directly to BMW, as well as countless other automotive companies, their history of reliability and variety of offered parts makes Schaeffler a go-to replacement parts provider for all of us here at Turner Motorsport.
As a leading source of high performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts. All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform!
If you need the hydraulic belt tensioner, click here.
This item is 70mm Diameter. Please check the diameter before ordering.
This tensioner pulley fits the following BMWs:
1991-1995 E34 525i (M50 engine)
1992-1999 E36 325i, 325is, 328i, 328is, 323is
1995-1999 E36 M3 (M3 3.0 & M3 3.2 liter)
1997-2003 E39 525i, 528i, 530i - Only for Hydraulic Tensioner
1999-2000 E46 323i, 323Ci, 328i, 328Ci - Only for Hydraulic Tensioner
2001-2005 E46 325i, 325Ci, 325xi, 330i, 330Ci, 330xi - Only for Hydraulic Tensioner
2001-2006 E46 M3 coupe & convertible - Only for Hydraulic Tensioner
2000-2006 X5 3.0 liter (E53 chassis)
2004 E60 525i, 530i (M54 engine)
1997-2002 Z3 & MZ3 2.5, 2.8, 3.0, M Roadster, M Coupe
2003-2009 Z4 M Coupe and Roadster
If you're grappling with issues like crankshaft failures and oil pump breakdowns in your BMW 6-cylinder engines, you're not alone. Even seasoned mechanics can overlook the critical aspect of harmonic resonance control in these inline-6 motors, despite their optimal configuration.
Enter ATI Performance Products in collaboration with VAC Motorsports, presenting a solution in the form of new dampers tailored for BMW 2.5L, 2.8L, 3.0L, and 3.2L straight-6 engines found in various models like the E36 and E46 M3, E9X, and E6X, as well as newer Z3s and Z4s. These dampers effectively nullify crankshaft harmonic vibrations, paving the way for enhanced horsepower and torque output, alongside a reduction in internal engine wear. Say goodbye to issues like fractured oil pumps and timing chain mishaps! By pairing these dampers with a VAC accessory pulley, you seamlessly replace the OEM balancer. Featuring a 7” outer diameter and OEM-style timing alignment tabs, these ATI Super Dampers boast SFI 18.1 Safety Certification, ensuring they're competition-ready.
What sets the ATI SuperDamper apart? It's the remedy for vibration woes in inline 6 engines, especially those equipped with lightweight clutch and flywheel setups. Expect diminished wear on bearings, engine accessories, and oil pumps, all while being compatible with underdrive pulleys.
Included in the kit are the damper itself, a lightweight VAC Billet Crankshaft Pulley, along with all necessary mounting and installation hardware. Note that it's not compatible with S50B30 & S50B32 Euro Engines. For street/track vehicles with air conditioning, opting for the Additional A/C Pulley Option is imperative, given that the OE A/C pulley isn't compatible. Rest assured, all required mounting and installation hardware is included, and the entire package is proudly Made in the USA.
This product was last offered at the strikethrough price on
11-07-2026
This product was last offered at the strikethrough price on
11-07-2026
This product was last offered at the strikethrough price on
08-13-2026
This product was last offered at the strikethrough price on
10-22-2026
Crafted from high-grade domestic USA 6061-T6 Billet Aluminum, these pulleys are a testament to precision engineering. Rigorously tested through extensive hours of racing and street use, they've proven their reliability and performance excellence.
Each pulley is meticulously zero-balanced and thoroughly inspected to ensure zero-runout, guaranteeing optimal performance without compromising on reliability, noise, or vibration.
This comprehensive kit comprises a precision power steering pulley, water pump pulley, and an OE Contitech Brand drive belt. Experience a notable boost of 8hp and 7 ft/lbs. of torque to the wheels, making it ideal for stock vehicles, track cars, and even those with upgraded audio systems seeking consistent voltage output from their alternators.
This product was last offered at the strikethrough price on
11-07-2026
This product was last offered at the strikethrough price on
11-07-2026
This product was last offered at the strikethrough price on
10-27-2026
This tensioner is for either the Water Pump or Alternator on cars with the mechanical belt tensioner system. Please check to ensure your car does not have the hydraulic tensioner. This tensioner comes with the pulley assembly.
As a leading source of high performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts. All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform!
Only for cars with Mechanical belt tensioner systems.
This item fits the following BMWs:
1992-1998 E36 BMW 323is 323ic 325i 325is 325ic 328i 328is 328ic
1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi
1991-1995 E34 BMW 525i
1997-2003 E39 BMW 525i 528i 530i
2004-2005 E60 BMW 525i 530i
2004-2006 E83 BMW X3 2.5i X3 3.0i
2000-2006 E53 BMW X5 3.0i
1997-2002 Z3 BMW Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0i
2003-2005 Z4 BMW Z4 2.5i Z4 3.0i
This product was last offered at the strikethrough price on
09-14-2026
This product was last offered at the strikethrough price on
11-07-2026
This product was last offered at the strikethrough price on
11-07-2026
The OEM INA Tensioner Bearing allows the belt tensioner arm to rotate and apply pressure to the serpentine belt. With a bad bearing, the arm may seize up and prevent the tensioner from working properly.
OEM Schaeffler (INA, LuK, & FAG) is an engineering company that focuses on high-performance, precision manufacturing. With their individual brands INA, Luk, and FAG providing exceptionally high quality parts directly to BMW, as well as countless other automotive companies, their history of reliability and variety of offered parts makes Schaeffler a go-to replacement parts provider for all of us here at Turner Motorsport.
As a leading source of high performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts. All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform
This product was last offered at the strikethrough price on
08-26-2026