Original BMW Adjusting Pulley with Lever, S65 Accessory Belt Tensioner for BMW M3 E90, E92, and E93 (2008–2013)

For the S65-powered M3, the Original BMW adjusting pulley with lever is the accessory drive belt tensioner assembly fitted to the E90 sedan, E92 coupe, and E93 convertible from 2008 to 2013. The pulley and its tensioning arm come as one unit, made in Slovakia, and BMW has produced this number since April 2008. The tensioner holds the correct pressure on the drive belt, which turns accessories such as the alternator, power steering pump, water pump, and A/C compressor. It is sold as one complete assembly.

Original BMW Parts carry a 24-month parts warranty.

This number replaced 11-28-7-841-527's predecessor, 11-28-7-838-196, and BMW marks the change as not exchangeable retrospectively. Read the number on the tensioner you are removing before ordering. A failing tensioner shows up as the belt bouncing and hopping because the arm no longer holds even pressure. A worn pulley bearing on the assembly adds uneven resistance and makes the bounce worse. A dragging power steering pump, A/C compressor, or idler pulley can mimic a bad tensioner, so check the other belt-driven components for smooth rotation before you condemn this one. If the tensioner is the culprit, replace it together with the related belt components for a full belt service.

Technical Details

• Manufacturer: BMW (Original BMW Parts)
• Part number: 11-28-7-841-527
• BMW part name: adjusting pulley with lever
• Function: accessory drive belt tensioner
• Production start: April 2008
• Previous number: 11-28-7-838-196, not exchangeable retrospectively
• Engine: S65
• Country of manufacture: Slovakia
• Sold as: one assembly with pulley and lever
• Warranty: 24 months

Common Questions

How do I know the tensioner is failing?
Watch the belt with the engine running. If it bounces or hops, the tensioner is no longer applying steady pressure.

Could another part cause the same symptom?
Yes. A dragging power steering pump, A/C compressor, or idler pulley can mimic a bad tensioner, so check each one for smooth operation first.

Fitment & Compatibility

Use the fitment table below to confirm year, model, submodel, and application notes before ordering. With over 20 years of parts and fitment experience, PMB Performance can match this to your VIN.