Original BMW Drive Belt Deflection Pulley for BMW 535d, 740Ld xDrive, and X5 xDrive35d (2014–2018)

The Original BMW deflection pulley 11-28-8-511-737 is the smooth idler wheel that guides the accessory drive belt on the N57 six-cylinder diesel in the BMW 535d, 740Ld xDrive, and X5 xDrive35d. It works with the belt tensioner to hold belt tension and to route the belt around the engine-driven accessories. BMW gives this pulley a weight of 231 g (0.5 lb), and BMW's parts data shows it entering production in March 2011. It is made in France and sold as a single piece.

Original BMW Parts carry a 24-month parts warranty.

An idler pulley has no drive function of its own. It changes the belt's direction and adds wrap around neighboring pulleys, so the belt grips the accessories it turns. BMW uses this same pulley across a wide range of N57 diesel engines, including the N57N and N57Z versions found in the F10 and F11 5 Series, the F07 Gran Turismo, the F01 and F02 7 Series, and the F15 X5. A worn unit usually shows itself through visible wear or grooves on the pulley face, belt squeal, chirping or grinding from the bearing, odd or uneven belt wear, or a pulley that sits out of line with its mounting surface.

Technical Details

• Manufacturer: BMW (Original BMW part)
• Part number: 11-28-8-511-737
• BMW part name: deflection pulley, accessory drive belt
• Weight: 231 g (0.5 lb)
• Production start: March 2011
• Engine family: N57 six-cylinder diesel
• Country of manufacture: France
• Sold as: one pulley
• Warranty: 24 months

Installation & Tuning Notes

In most cases it is recommended to replace the idler pulley at the same time as the belt tensioner.

Common Questions

Should I replace the belt tensioner at the same time?
In most cases, yes. The idler pulley and tensioner work together, and in most cases it is recommended to replace them at the same time.

Will this pulley fit a gasoline 535i?
No. BMW applies this part number only to N57 diesel engines.

What sound points to a bad idler pulley?
Chirping or grinding from the pulley bearing, often with belt squeal, is the usual sign.

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.