2024 BMW X1 DCT Transfer Case Wear SIB 28 01 24

BMW has released Service Information Bulletin (SIB) SIB 28 01 24, dated July 3, 2024, to address a potential wear issue affecting the double clutch transmission (DCT) and transfer case connection in the 2024 BMW X1 Sports Activity Vehicle (U11). This bulletin is a revision 2 and supersedes SI B28 01 24 dated May 2024, with updates to the procedure and parts list.

The bulletin outlines a service action to rework the mating surface area to prevent premature wear. This issue, described as 2024 BMW X1 double clutch transmission wear, is a proactive measure to maintain vehicle performance and longevity.

Symptoms

The 2024 BMW X1 double clutch transmission wear is caused by micro-movements combined with frictional corrosion. This can lead to increased wear on the longitudinal splined connection between the double clutch transmission (DCT) and the transfer box. While the bulletin does not specify immediate owner-perceptible symptoms, it describes a condition that can lead to future issues if not addressed.

Correction and Repair Overview

The correction involves reworking the surface mating area on the double clutch transmission (DCT) at the transfer case. This service action is designed to mitigate the effects of micro-movements and frictional corrosion, thereby preventing further wear on the critical connection between these two components.

Repair Procedure Summary

The repair procedure outlined in SIB 28 01 24 involves several key steps:

1. Transfer Box Removal: The transfer box must be removed following BMW's specific repair instructions, reference 27 10 010, for "Removing and installing the transfer box."
2. DCT Spline Cleaning: The inner splines of the double clutch transmission (DCT) are to be thoroughly cleaned using brake cleaner and a brass wire brush. It is crucial to use only a brass wire brush or a softer material to avoid damage.
3. Radial Shaft Oil Seal Replacement: The radial shaft oil seal for the DCT, as specified in the repair instructions, must be replaced.
4. Grease Application: Grease, specifically MI-Setral-43N, is to be applied evenly to the inside of the input flange. The goal is to ensure that the spaces between the teeth are completely filled.
5. Excess Grease Removal: Any excess grease must be carefully cleaned off the end face of the gear. It is essential to ensure that no grease comes into contact with the shaft seal (2).
6. Loctite Application: A continuous bead of BMW Group Loctite 5970 Liquid Sealant (Part Number 83 19 0 404 517) must be applied to the input shaft of the transfer case. The transfer case must then be installed immediately after the Loctite application.
7. Washer Installation: Special washers are to be installed between the stabilizer link and the transfer case before bolting the transfer case to the DCT.

Required Tools or Parts

This service action requires specific parts and bulk supply materials. The following items are listed in the bulletin:

Part Number	Description	Quantity
27 10 8 627 024	Screw plug	1
27 10 9 807 707	Retaining ring	1
37 14 6 869 771	Thread-tapping hexagon bolt	1
31 20 6 866 022	Shouldered bolt with compression spring	1
26 11 8 681 576	Output repair kit	1
18 30 5 A04 BD6	V clip	1
07 11 9 904 024	Hexagon nut (rounds to 10)	2
07 11 9 909 839	Hexagon bolt	2
28 00 5 B31 BA6	Inner shaft sealing ring, driven shaft	1
07 14 9 894 132	Multi-purpose bolt ASA (M12x90x1.5)	1
22 11 8 876 816	Adapter washer kit	2
07 11 9 909 527	Hexagon bolt	1
07 11 9 906 927	Hexagon bolt	1

Bulk Supply Materials - Sublet

Part Number	Description	Quantity
83 19 0 404 517	BMW Group Loctite 5970 Liquid Sealant- (50 mL)	Sublet
83 23 2 152 082	Grease MI-Setral-43N (50 g)	Sublet

Important Warnings / What Owners Should Know

BMW has provided specific instructions and warnings regarding this service action:

• Pre-Delivery Service: Dealers are instructed to perform this procedure on all affected vehicles before customer delivery. If a customer has already taken delivery, the procedure should be performed the next time the vehicle is in the shop, provided the campaigns have a status of remedy available. Otherwise, the vehicle can be released.
• Mobile Friendly Repair: This repair is designated as "THIS REPAIR IS MOBILE FRIENDLY."
• No Oil Change Required: Contrary to some repair instructions, "no oil change is required for the double clutch transmission" during this procedure.
• Grease Application Caution: When applying grease, technicians must "Ensure the grease makes no contact with the shaft seal (2)."
• Loctite Application: After applying Loctite 5970, "The transfer case must be installed immediately after applying the Loctite."
• Campaign Status Check: Vehicles requiring this campaign will show as “Open” when checked in AIR, AWP, Campaign Summary, or Warranty Vehicle Inquiry systems.

Owner Action

If you own a 2024 BMW X1 (U11), it is recommended to contact your authorized BMW dealership. They can check if your specific vehicle is affected by Service Information Bulletin SIB 28 01 24 by reviewing its campaign status. This service action, identified by Repair Code 0028230100 for "U11 Reworking DKG connection - transfer box," will be performed at no cost to the owner under warranty. The bulletin also notes that Alternative Mobility Solution (AMS) expense reimbursement is available for this service action.

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NHTSA ID: 11005216