Original BMW Timing Chain Tensioner for BMW 550i, 650i, 750i, M5, M6, M850i, X5, and X6 (2008–2024)

BMW's chain tensioner 11-31-7-557-741 preloads the timing chain on the N63 V8, S63 M V8, and N74 V12 engines, holding the guide rail against the chain so slack cannot build up in the 550i, 650i, 750i, M5, M6, M850i, X5, X6, and related models. BMW's parts data shows production starting in July 2008. This tensioner is made in Romania and is sold as a single piece.

Original BMW Parts carry a 24-month parts warranty.

One part number covers the whole family, from the first N63 in the E71 X6 and F01 7 Series through the N63N, N63R, N63B, and N63M updates, the S63N, S63R, and S63M in M cars, and the N74 and N74B V12. Over tens of thousands of miles a tensioner can lose its ability to keep the chain taut, and too much slack can let the chain skip or derail. Typical warning signs are rattle or slap from the timing case on startup and camshaft or crankshaft correlation fault codes with a check engine light.

Technical Details

• Manufacturer: BMW (Original BMW part)
• Part number: 11-31-7-557-741
• BMW part name: chain tensioner
• Function: tensions the timing chain guide rail
• Engines: N63, S63, and N74 families
• Production start: July 2008
• Country of manufacture: Romania
• Sold as: one tensioner
• Warranty: 24 months

Common Questions

What happens if a worn tensioner is ignored?
If the timing drifts far enough, the valvetrain can contact the pistons and cause engine damage.

Will a new tensioner cure startup rattle?
Installing a new tensioner is the first step to see if the sound goes away. If it does not, a timing chain service is likely needed.

PMB carries Original BMW timing parts for the N63, S63, and N74 engines.

Fitment & Compatibility

Check the table below for the exact year, model, submodel, and any listed notes. Send your VIN and PMB Performance will confirm the fit, drawing on more than 20 years in the trade.