NHTSA ID Number: 11014673
Manufacturer Communication Number: MC230121
TSB/Document Date: 2025-03-03
Summary
Sealing ring on the differential cover of the reverser is leaking. Radial shaft seal faulty.
2/14/25, 1:54 PM
23 01 21_DIFFERENTIAL COVER LEAK AT THE REVERSER SHAFT SEAL
SIB 23 01 21
DIFFERENTIAL COVER LEAK AT THE REVERSER SHAFT SEAL
2025-02-13
This Service Information Bulletin replaces SI 23 01 21 dated March 11, 2021.
What is new:
1. Differential covers are now more readily available. The procedure section has been re written to accommodate for this
update.
MODEL
Model
K48/11
K48/12
K61
Model Description
K 1600 GT
K 1600 GTL
K 1600 B and Grand America
SITUATION
Sealing ring on the differential cover of the reverser is leaking.
Radial shaft seal faulty.
PROCEDURE
The differential cover of the reverser cannot be serviced by just replacing the sealing ring alone. This is
because a special device is required to properly assemble the eccentric shaft with the eccentric lever and
bring the lever system into the correct position.
The recommended repair solution is to replace the entire differential cover of the reverser.
Replacement differential covers are now more readily available.
If a customer's bike has a leak on the sealing ring of the differential cover, first check to see if replacement
differential covers are available. If the differential cover is not available, then the only solution is to replace
Copyright ©2025 MOTORRAD USA, a division of BMW
of North America, LLC. All Rights Reserved
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2/14/25, 1:54 PM
23 01 21_DIFFERENTIAL COVER LEAK AT THE REVERSER SHAFT SEAL
the complete transmission assembly.
Claims of complete transmission assemblies from Feb 13th, 2025 and forward will require documentation via
warranty IDS ticket, where the differential cover was not available at the time of replacement.
PARTS INFORMATION
Obtain and confirm the part numbers for your specific vehicle by entering the chassis number in ETK which
takes into account specific equipment and/or options.
Additional parts like gaskets, hardware and chemicals may be required for the complete repair.
WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty for Motorcycles, if applicable.
Submit an “Info Only” TSARA case for documentation if being repaired under the New Vehicle Limited
Warranty.
Defect code
2311014800
Gearbox Leaking
For complete transmission replacement, see AIR for the applicable Labor Operations.
QUESTIONS REGARDING THIS BULLETIN
Technical inquiries
Warranty inquiries
Parts inquiries
Contact the BMW Technical Support Group via TSARA
Submit an IDS ticket to the Warranty Department
Submit an IDS ticket to the Motorrad Parts Department
Supporting Materials
insert_drive_file IMG_0454.jpg
picture_as_pdf 23 01 21 Differential cover leak.pdf
picture_as_pdf 23 01 21 Differential cover leak at the reverser shaft seal.pdf
insert_drive_file IMG_0454.jpg
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2/14/25, 1:54 PM
23 01 21_DIFFERENTIAL COVER LEAK AT THE REVERSER SHAFT SEAL
Copyright ©2025 MOTORRAD USA, a division of BMW of North America, LLC. All Rights Reserved
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3/3
Service Information Bulletin
Manual Gearbox, Transmission
March 11, 2021
23 01 21
DIFFERENTIAL COVER LEAK AT THE REVERSER
SHAFT SEAL
This Service Information Bulletin replaces SI 23 01 21 dated March 2021.
MODEL
Model
K48/11
K48/12
K61
Model Description
K 1600 GT
K 1600 GTL
K 1600 B and Grand America
SITUATION
Sealing ring on the differential cover of the reverser is leaking.
Radial shaft seal faulty.
PROCEDURE
It is not possible to change just the sealing ring in the differential cover of the reverser, as a special
device is needed to assemble the eccentric shaft with the eccentric lever in order to bring the lever
system into the correct position. The repair solution should be to replace the differential cover of the
reverser, but these are currently unavailable.
© 2021, BMW of North America, LLC. The contents of this document are confidential and should not be shared with third
parties for distribution. All pricing subject to change.
Page | 1
If a customer bike has a leak on the reverser sealing ring of the differential cover, the current solution
is the replacement of the complete transmission assembly.
When the differential covers become available, this bulletin will be updated with a new repair
procedure, as well as part and warranty information.
PARTS INFORMATION
Obtain and confirm the part numbers for your specific vehicle by entering the chassis number in ETK
which takes into account specific equipment and/or options.
Additional parts like gaskets, hardware and chemicals may be required for the complete repair.
WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty for Motorcycles, if applicable.
Submit an “Info Only” TSARA case for documentation if being repaired under the New Vehicle Limited
Warranty.
Defect code
2311014800
Gearbox Leaking
For complete transmission replacement, see AIR for the applicable Labor Operations.
QUESTIONS REGARDING THIS BULLETIN
Technical inquiries
Warranty inquiries
Parts inquiries
Contact the BMW Technical Support Group via TSARA
Submit an IDS ticket to the Warranty Department
Submit an IDS ticket to the Motorrad Parts Department
© 2021, BMW of North America, LLC. The contents of this document are confidential and should not be shared with third
parties for distribution. All pricing subject to change.
Page | 2
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TSB/Document ID: MC230121
Replacement Service Bulletin Number:
MFR Communication Date: 2025-02-13
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: POWER TRAIN
MFR Component System:
MFR Component Subsystem:
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