Original BMW Drive Belt Pulley Protection Cap for BMW 3 Series, 5 Series, M5, M6, X5, Z3, and Z4 (1991–2010)

The Original BMW drive belt pulley protection cap, part 11-28-1-730-349, keeps dirt and debris away from the pulley system on BMW 3 Series, 5 Series, M5, M6, X5, Z3, and Z4 models from 1991 to 2010. BMW calls it simply a protection cap and puts its weight at 8 grams. Production started in January 1990, and the part is still current under the same number. It is made in Germany. Grit that works into a pulley cuts into the performance and efficiency of the belt drive, and this small cover is there to keep it out.

Original BMW Parts carry a 24-month parts warranty.

One part number covers an unusually wide spread of engines. BMW fits this cap to the M42 and M43 four-cylinders, to the M50, M52, M54, and M56 inline sixes, to the S50, S52, and S54 M engines, and to the S85 V10 in the E60 M5 and E63 M6. The chassis run from the E34 and E36 through the E39, E46, and E53 to the Z3, E85, and E86. BMW shows no earlier or replacement number for this cap, so the main thing to match is your model and year.

Technical Details

• Manufacturer: BMW (Original BMW Parts)
• Part number: 11-28-1-730-349
• BMW part name: Protection cap
• Application: drive belt pulley
• Weight: 8 g (0.28 oz)
• Production start: January 1990, still in production
• Country of manufacture: Germany
• Sold individually, by the piece
• Warranty: 24 months

Common Questions

What does this cap actually do?
It keeps dirt and debris from contaminating the drive belt pulley, where grit can reduce performance and efficiency.

Is the same cap used on M engines?
Yes. BMW uses this part number on the S50, S52, and S54 M engines and on the S85 V10, as well as on the standard four- and six-cylinder engines.

Where is it made?
This genuine BMW part is made in Germany.

Small as it is, this cap is the factory piece, and PMB can ship it with the rest of your belt drive order.

Fitment & Compatibility

Confirm your model year and submodel against the table below before ordering. PMB Performance can confirm this against your VIN, backed by more than 20 years of parts and fitment work.