Diagnosis Of The Driveshaft Flexible Disc (SI B26 01 21)

Publication date: 2021-10-04
Reference number: SI B26 01 21

DIAGNOSIS OF THE DRIVESHAFT FLEXIBLE DISC

TECHNICAL SERVICE BULLETIN

Reference Number(s): SI B26 01 21, Date of Issue: October 04, 2021

BMW:	All Models

SITUATION

When performing a routine underbody inspection, the flexible disc located either at the front, rear, or at both ends of the rear propeller shaft (aka the driveshaft) may indicate signs of cracking.

CAUSE

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 on the flexible disc is normal and acceptable.

PROCEDURE

Refer to the attachment to determine if the flexible disc is acceptable or must be replaced.

NOTE: If the disc must be replaced based on the inspection criteria, refer to Repair Instructions:

Front flex disc (transmission side) REP 26 11 051 Replacing the flexible disc for the front propeller shaft
Rear flex disc (rear differential side) REP 26 11 052 Replacing flexible disc for rear propeller shaft.

CLAIM INFORMATION

This Service Information Bulletin provides technical, diagnostic, and repair-related information.

Eligible and Covered Work/Repairs

Based on the guideline for replacements in the attachment, when this information is used to perform a repair, or in conjunction with performing a repair that addresses a verified defect in materials or workmanship, eligible repairs are covered under the terms of the BMW New Vehicle Limited Warranty for Passenger Cars and Light Trucks.

To submit a claim, please follow the established and applicable warranty policy and procedures (Labor/Part/Sublet) that apply to the repair being performed.

Refer to AIR for the corresponding Defect Code, flat rate labor operations (including diagnosis) and the flat rate unit (FRU) allowances.

Only one Main labor operation code can be claimed per repair visit.

Based on which one applies to your center, please refer to SI B01 01 20 or B01 07 20 for claiming your diagnosis work time, job/repair work time (WT), RO/Claim WT and/or repair explanation procedures, unless otherwise required by State law.

QUESTIONS REGARDING THIS BULLETIN

Technical inquiries	Submit feedback at the top of this bulletin
Warranty inquiries	Please contact the Warranty department by either using the Live Chat that's available in the Warranty Documentation Portal or through IDS by selecting Coverage, Policy, Coding Questions and Mileage Corrections
Parts inquiries	Submit an IDS ticket to the Parts Department

Supporting Materials

picture as pdf Attachment B26 01 21.pdf