Original BMW M42/M44 Four-Cylinder Lower Deflection Rail, Right Side, for E36 BMW 318i, 318is, 318ti, and Z3 Roadster (1993–1999)

Original BMW deflection rail 11-31-1-739-130 is a guide rail in the timing chain drive of the M42 and M44 four-cylinder engines in the E36 318i, 318is, 318ti, and Z3 1.9. A deflection rail is a fixed guide the timing chain runs against, and it steers the chain between sprockets in the timing case. It is also known as the lower deflection rail, and it is also described as the right-side guide rail pin. The part weighs 50 grams, and BMW sells it as a single piece.

Original BMW Parts carry a 24-month parts warranty.

BMW shows production of this rail from September 1993, and no earlier number is shown as replaced by it. That date matters for early cars, because 1993 models qualify only from that build date onward. Coverage takes in both the 1.8-liter M42 and the later 1.9-liter M44, so the same rail serves the four-cylinder E36 through the engine change. BMW includes the E36 Cabrio among the applications, along with the sedan, 318is coupe, 318ti compact, and the Z3 roadster. Since this rail has a set location in the timing case, check its position against the rail you are replacing.

Technical Details

• Manufacturer: BMW (Original BMW)
• Part number: 11-31-1-739-130
• BMW part name: deflection rail
• Also known as: lower deflection rail, right-side guide rail pin
• Engines: M42 1.8-liter and M44 1.9-liter four-cylinder
• Weight: 50 g (0.1 lb)
• Production start: September 1993
• Sold individually
• Warranty: 24 months

Common Questions

Does this fit an early 1993 318i?
Only cars built from September 1993 onward, when production of this rail began.

Does it fit both the M42 and M44 engines?
Yes. BMW applies it to both the M42 and M44 in the E36, and to the M44 in the Z3 1.9.

Fitment & Compatibility

Use the fitment table below to confirm year, make, model, submodel, and any notes tied to your exact vehicle. Pay close attention to engine, chassis, position, and option-specific details before ordering. With over 20 years of parts and fitment experience, PMB Performance can match this to your VIN.