Original BMW Lower Timing Chain Guide Rail BMW 550i, 650i, 750i, Alpina B7, X5, and X6 V8 (2008–2014)

Built for BMW's V8 engines, Original BMW guide rail 11-31-7-574-397 is the lower timing chain guide for N63 and S63 engines in the 550i, 650i, 750i, Alpina B7, X5, and X6 from 2008–2014. In the timing case, the guide rail sets the path the chain follows between the crankshaft and camshaft sprockets. It works together with the tensioner to control chain slack and vibration. The guide's plastic wear surface slowly wears down over time. As it wears, the chain develops slack and can produce the rattle known as chain slap, which is most noticeable at startup or idle. BMW gives the weight as 127 g, and this part is made in Germany.

Original BMW Parts carry a 24-month parts warranty.

BMW calls this part Guide rail. Removing the timing cover on an N63 or S63 is a long, involved job. For that reason, any guide that shows wear should be replaced while the cover is already off, rather than reused. BMW's parts data shows production starting in July 2008. It is sold individually, as one piece.

Technical Details

• Manufacturer: BMW (Original BMW Parts)
• Part number: 11-31-7-574-397
• BMW part name: Guide rail
• Position: lower timing chain guide
• Weight: 127 g (0.3 lb)
• Production start: July 2008
• Country of manufacture: Germany
• Sold as: one piece
• Warranty: 24-month parts warranty

Installation & Tuning Notes

If the timing cover is off for any reason, inspect every timing chain guide. Replace any guide that shows wear. N63 and S63 timing work calls for dedicated cam and crank locking tools.

Common Questions

What noise does a worn guide make?
Usually a rattle or clatter from the timing area, most often at startup or idle. In severe cases, the chain can jump timing, which causes misfires, stalling, or hard starting.

Is this the upper or the lower guide?
This is the lower timing chain guide for the N63 and S63 V8.

Fit this guide while the timing case is open and avoid a second teardown.

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.