Original BMW Timing Chain Slide Rail for Twin Chain, BMW E30 M3 and E24 M6 (1987–1991)

Built for the S14 and S38 engines, this Original BMW slide rail guides the twin (duplex) timing chain in the E30 M3 and the E24 M6. BMW calls it the slide rail for the twin chain. It weighs 85 g and has been in production since July 1986. Its job is to guide the chain along its path between the crankshaft and camshaft sprockets while the engine runs. Its plastic face wears against the chain over tens of thousands of miles, and once it is worn the guide needs to be replaced. This rail is made in Germany.

Original BMW Parts carry a 24-month parts warranty.

The same rail appears in BMW's data for several motorsport and M applications that share these engine families. On the S14 side these include the E30 320is, the E30 M3 Group A/DTM and Group N cars, and the E36 318iS Class 2. On the S38 side they include the E28 and E34 M5 and the E24 M635CSi. A slide rail works with the timing chain tensioner. The tensioner sets the chain's tension, and the rail controls the path the chain takes and limits how far it can move. When you are already into a timing chain service, it is a good idea to replace the guides at the same time.

Technical Details

• Manufacturer: BMW (Original BMW Parts)
• Part number: 11-31-1-308-495
• BMW name: Slide rail, twin chain
• Weight: 85 g (0.2 lb)
• Production start: July 1986
• Engines: S14 and S38
• Country of manufacture: Germany
• Sold individually, one rail per order
• Warranty: 24 months

Installation & Tuning Notes

Replace this rail as part of a timing chain service rather than reusing a guide with a worn plastic face.

Common Questions

What does a worn timing chain guide sound like?
The most common sign is a rattling or clattering from the engine, especially at startup or idle, caused by a loose chain striking nearby parts.

Does the same rail fit the S38 M5?
BMW's data shows it on the E28 and E34 M5 with the S38. Confirm by VIN, because PMB's fitment for this item covers the M3 and M6.

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.