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Product details
This Original BMW adjusting pulley with lever is the drive belt tensioner pulley that keeps the accessory drive belt under tension on the 2008 BMW M3 with the S65 engine. BMW calls it the adjusting pulley with lever. The name describes the assembly: a belt pulley carried on a pivoting arm, not a loose idler wheel. It comes as one complete unit, so the pulley and lever arrive together and no separate arm is needed. BMW shows production of this number starting in June 2007. An accessory drive belt turns the engine's belt-driven accessories, and the tensioner holds enough load on that belt to stop it slipping as engine speed and accessory demand change.
Original BMW Parts carry a 24-month parts warranty.
A failing tensioner usually shows up as a belt that bounces, hops, or wobbles because the arm can no longer hold even, constant pressure. A worn pulley bearing on the arm adds drag and makes the problem worse. Before you order, check the other belt-driven accessories and idler pulleys by hand. A dragging power steering pump or A/C compressor can cause intermittent drag that looks like a tensioner fault. When the tensioner itself has slack, replace it and its associated components together as a full belt service.
Technical Details
- Manufacturer: BMW (genuine part)
- Part number: 11-28-7-838-196
- BMW part name: adjusting pulley with lever
- Function: accessory drive belt tensioner pulley
- Engine: S65, BMW M3
- Production start: June 2007
- Sold as: one assembly, pulley and lever together
- Warranty: 24 months on Original BMW Parts
Common Questions
How can I tell whether the tensioner is the problem?
Watch for a belt that bounces or hops and a pulley bearing that feels rough. Rule out the other accessories and idler pulleys first, because a dragging component can look like a tensioner fault.
Does this include the arm or only the pulley wheel?
It includes both. BMW supplies the pulley and its lever as a single assembly.
Should anything else be replaced at the same time?
If slack in the tensioner is making the belt wobble, replace the tensioner and its associated components as a complete belt service.
PMB Performance can help you sort out the rest of the S65 belt drive while you have it apart.
Fitment & Compatibility
Confirm your model year and submodel against the table below before ordering. With over 20 years of parts and fitment experience, PMB Performance can match this to your VIN.
| Year | Make | Model | Submodel | Notes |
|---|---|---|---|---|
| 2008 | BMW | M3 |
