Original BMW Belt Tensioner Pulley with Lever for BMW M5 and M6 S85 V10 (2006–2010)

The Original BMW belt tensioner pulley with lever, part number 11-28-7-839-135, keeps steady tension on the serpentine belt of the S85 V10 in the BMW M5 and M6 from 2006–2010. BMW calls it the adjusting pulley with lever, so the idler wheel and the pivoting arm that carries it come as one assembly. A belt tensioner presses against the serpentine belt so the driven accessories turn without slipping as engine speed rises and falls. This version entered production in January 2007. It is made in Slovakia and sold individually as a single piece.

Original BMW Parts carry a 24-month parts warranty.

Part number 11-28-7-839-135 replaces the earlier 11-28-7-835-416. BMW marks that change as exchangeable retrospectively, which means the current pulley can go on cars that left the factory with the older number. If an old invoice, a service record, or the pulley on your engine shows 835-416, this is the number to order now. BMW lists this number for the E60 M5, E61 facelift M5, E63 M6 and E64 M6.

Technical Details

• Manufacturer: BMW, Original BMW part
• Part number: 11-28-7-839-135
• BMW part name: adjusting pulley with lever
• Supersedes 11-28-7-835-416, exchangeable retrospectively
• Production start: January 2007
• Engine: S85 V10
• Made in Slovakia
• Sold individually, one piece
• Warranty: 24 months

Common Questions

How can I tell this pulley is failing?
The most common failure is the internal bearing running dry, which makes a lot of noise with the engine running. A dry-running pulley can also come apart while the engine runs, which is a much larger problem.

My car has 11-28-7-835-416. Will this number work?
Yes. BMW rates the newer 11-28-7-839-135 as exchangeable retrospectively, so it directly replaces the earlier number.

Fitment & Compatibility

Confirm your model year and submodel against the table below before ordering. Send your VIN and PMB Performance will confirm the fit, drawing on more than 20 years in the trade.