2024 BMW X1 DCT Transfer Case Wear Service Action

BMW has issued Service Information Bulletin SIB 28 01 24 to address a specific issue affecting the drivetrain of certain 2024 BMW X1 (U11) models. This service action focuses on preventing wear on the connection between the double clutch transmission (DCT) and the transfer box.

What's Being Addressed

The core problem identified is that micro-movements, combined with frictional corrosion, can lead to increased wear on the longitudinal splined connection that links the double clutch transmission (DCT) to the transfer box. This wear can compromise the integrity and performance of the drivetrain components in affected vehicles. The service action aims to correct this by reworking the surface mating area on the double clutch transmission (DCT) at the transfer case.

Repair Procedure Summary

To resolve the potential for BMW X1 DCT transfer case wear, technicians will perform a series of steps detailed in service action SIB 28 01 24. The procedure involves carefully disassembling, cleaning, and reassembling specific components:

1. The transfer box is removed following BMW repair instructions 27 10 010, which detail the removal and installation process.
2. The inner splines of the DCT are thoroughly cleaned using brake cleaner and a brass wire brush. A brass wire brush is specified to prevent damage to the splines.
3. Similarly, the outer splines of the transfer case are cleaned with brake cleaner and a brass wire brush.
4. The radial shaft oil seal for the DCT is replaced as part of the repair.
5. Grease, specifically MI-Setral-43N, is applied evenly to the inside of the input flange to ensure all spaces between the teeth are filled.
6. Any excess grease is carefully cleaned from the end face of the gear, ensuring it does not contact the shaft seal.
7. A continuous bead of Loctite 5970 Liquid Sealant is applied to the input shaft of the transfer case. The transfer case must then be installed immediately after this application.
8. Special washers are installed between the stabilizer link and the transfer case before the transfer case is bolted to the DCT.

Required Parts and Materials

This service action requires several specific parts and bulk supply materials. Dealers will use the following items for the repair:

Bulk Supply Materials - Sublet

Claim Information for Dealers

Reimbursement for this service action, identified by repair code 0028230100 (U11 Reworking DKG connection - transfer box), will be processed through normal claim entry using applicable work packages. Dealers should reference the SIB number and work package in technician notes and claim comments. The flat rate labor operation codes available are 00 75 870 for