TSBs

Inspect BMW Driveshaft Flex Discs

June 4, 2022

This bulletin applies to all BMW models. When performing underbody inspection, note that the flexible disc at either the front, rear or at both ends of the propeller shaft may show signs of cracking.

Information courtesy of Mitchell 1,

Mike Mavrigian

This bulletin applies to all BMW models. When performing underbody inspection, note that the flexible disc at either the front, rear or at both ends of the propeller shaft may show signs of cracking.

The outer surface of the disc consists of hard rubber which is slightly brittle. Due to exposure to driveshaft reversal loads and slight flexing, cracks can develop on the disc surface. Minor cracks are normal and acceptable.

Replacement is needed when more severe cracking/degradation is found. Refer to the sample photos.

About the Author

Information courtesy of Mitchell 1

Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.

About the Author

Mike Mavrigian | Motor Age Editor

Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.