Original BMW Drive Belt Tensioner, Adjusting Pulley with Lever, for BMW M3 (2008–2013)

Built for the S65 V8 in the E90, E92, and E93 BMW M3, this Original BMW adjusting pulley with lever is the automatic tensioner that holds the accessory drive belt at the correct tension. BMW sells it as one assembly with the pulley and the spring-loaded lever together. Part number 11-28-7-838-194 entered production in June 2007, and this unit is made in Slovakia. The accessory belt drives components such as the alternator, the power steering pump, and the A/C compressor. The tensioner keeps steady pressure on the belt so it does not slip or wander on its pulleys. An automatic tensioner like this one uses a spring to hold that tension constant, so it needs no manual adjustment in service.

Original BMW Parts carry a 24-month parts warranty.

BMW uses this single tensioner across every body of the S65 M3. That includes the E90 sedan, the E92 coupe, and the E93 convertible, both before and after their facelifts. A worn tensioner usually shows up as belt bounce and hop, because the spring can no longer apply even pressure. The pulley on the end of the lever also has its own bearing. When that bearing fails, it adds uneven drag that further upsets belt tension. Before blaming the tensioner, check the other belt-driven parts. A power steering pump, an A/C compressor, or an idler pulley that drags intermittently can mimic a bad tensioner. Check each idler and accessory to confirm they all run smoothly.

Technical Details

• Manufacturer: BMW
• Part number: 11-28-7-838-194
• BMW part name: Adjusting pulley with lever
• Type: automatic, spring-loaded accessory belt tensioner with integrated pulley
• Engine: S65 V8
• Production start: June 2007
• Country of manufacture: Slovakia
• Sold individually as one assembly
• Warranty: 24 months

Common Questions

What are the signs of a failing tensioner?
The belt bounces or hops, often together with a rough or noisy pulley bearing on the tensioner.

Could another part be causing the belt to bounce?
Yes. A dragging power steering pump, A/C compressor, or idler pulley can mimic a bad tensioner, so check that each one turns smoothly first.

Does the pulley come with the tensioner?
Yes. BMW supplies the pulley and lever as one assembly.

A fresh tensioner is a sensible part of any full belt service on an S65 M3.

Fitment & Compatibility

Use the fitment table below to confirm the exact year, make, model, submodel, and any application notes before ordering. PMB Performance can confirm this against your VIN, backed by more than 20 years of parts and fitment work.