• AMBW
  • Motor Age
  • Motor Age Training
  • Professional Distributor
  • PTEN
    1. TSBs

    Inspecting BMW flex disc cracks

    June 4, 2024
    This bulletin applies to all BMW models. When performing a routine underbody inspection, the flexible disc located at the front, rear or at both ends of the propeller shaft may indicate signs of cracking.
    Related To: Mitchell 1
    Photo courtesy of Mitchell 1
    Diagnosis of the driveshaft flexible disc. See the top row for an example of flex discs that must be replaced. Examples of normal minor cracks are shown in the bottom row.
    Diagnosis of the driveshaft flexible disc. See the top row for an example of flex discs that must be replaced. Examples of normal minor cracks are shown in the bottom row.

    This bulletin applies to all BMW models. When performing a routine underbody inspection, the flexible disc located at the front, rear or at both ends of the propeller shaft may indicate signs of cracking.

    The outer surface of the disc consists of hardened rubber which has a slightly brittle characteristic. 

    Due to the ongoing exposure to driveshaft load reversals and subsequent slight flexing, cracks can develop on the disc surface. Minor cracking is normal and acceptable.

    About the Author

    Motor Age Staff

    Motor Age has been publishing technical content for professional automotive technicians since 1899. Our writers have decades of experience and scores of ASE certifications, and they continue to teach new generations of technicians via classrooms all around the globe, as well as through the books and training manuals they've authored. 

    Email

    Continue Reading

    Sponsored Recommendations

    Save Time with Standard's Kits & Multipacks

    Stock up on essential repair kits! Discover how Standard's multipacks simplify repairs and reduce downtime.

    Fuel Injection Training – Pro Tips for Techs

    Choosing the right fuel injector matters. Learn best practices for selection and related component recommendations.

    ABS Sensor Insights – Get the Right Fit Every Time

    ABS sensors are critical to vehicle safety. Learn how they interact with electronic systems and how to choose the best replacement.

    Prevent Oil Filter Housing Failures – What Every Tech Should Know

    Learn why Pentastar oil filter housings commonly fail and how Standard's enhanced design prevents leaks.

    Voice Your Opinion!

    To join the conversation, and become an exclusive member of Vehicle Service Pros, create an account today!