Original BMW Timing Chain Guide for E30 and E36 318i and 318is M42 (1991–1994)

Built for the M42 four-cylinder in the BMW 318i and 318is, this Original BMW timing chain guide keeps the chain headed on its correct path between the crankshaft and camshaft sprockets. The part is also known as the timing chain tensioner rail. A chain-driven timing system is naturally noisier than a belt, and guides like this one quiet the drive with a plastic contact face. That plastic can wear down to the metal, which brings heavy noise from the timing case along with a timing problem. The guide weighs 22 grams, is made in Germany, and is sold individually.

Original BMW Parts carry a 24-month parts warranty.

BMW names the part simply a guide and has produced this number since September 1989. It is applied to the M42 engine in both the E30 and E36 chassis, so a 1991 E30 318is and a 1994 E36 318i take the same guide. A replacement guide is required whenever the M42 timing is serviced, so plan for it when ordering timing parts rather than reusing the old one.

Technical Details

• Manufacturer: BMW, Original BMW Parts
• Part number: 11-31-1-721-419
• BMW name: guide
• Also called: timing chain tensioner rail
• Engine: M42
• Weight: 22 g (0.78 oz)
• Production start: September 1989
• Sold as: one piece
• Made in Germany
• Warranty: 24 months

Common Questions

Do I need a new guide for a timing service?
Yes. A replacement guide is required when performing a timing service on the M42.

What happens when the guide wears out?
Its plastic face wears through to the metal, causing noise from the timing case and a timing issue.

Does one guide cover both E30 and E36 cars?
Yes. BMW applies it to the M42 in the E30 318i and 318is and in the E36 chassis.

Fitment & Compatibility

Use the fitment table below to confirm the exact year, make, model, submodel, and any application notes before ordering. PMB Performance has spent over 20 years matching parts to vehicles and can verify this against your VIN.