A/T - Fluid Seepage From The Fluid Pan Area
SI B24 08 06Automatic Transmission
August 2011
Technical Service
This Service Information bulletin supersedes SI B24 08 06 dated March 2010.
[NEW] designates changes to this revision
SUBJECT
ZF 6HP Transmissions - Mechatronic Sealing Sleeve Seepage
MODEL
E53, E60, E61, E63, E64, E65, E66, E85, E90, E91, E92, and E93 vehicles with ZF 6-speed 6HP19/21 or 6HP26/28 transmissions produced up to 04/08
SITUATION
Transmission fluid seepage is visible in the area of the transmission oil pan. In most cases, only an oil "wetness" spot is spotted in the back of the transmission oil pan (the transmission fluid does not drop on the ground).
CAUSE
The Mechatronic sealing sleeve's 0-ring tightness
PROCEDURE
1. Only if a visible leakage trace indicates a substantial loss of transmission fluid (e.g., transmission fluid accumulation on the underbody panel), replace the Mechatronic sealing sleeve.
The "oil wetness" in the area of the sealing sleeve is not an indication of substantial leak, and does not justify this repair.
2. Drain and save the long-term fill transmission fluid (Shell M-1375.4).
Replace the sealing sleeve (P/N 24 34 7 588 725) and the transmission oil pan gasket. Follow Repair Instruction REP 24 34 020.
Note:
It is not necessary to replace the transmission oil pan bolts set during this repair. Unnecessary pan bolts replacement will be debited.
Important:
Make sure to push the sealing sleeve firmly into the housing assembly before closing the white locking tab of the Mechatronic. To ease the sleeve installation, use some lubrication (e.g., transmission fluid) on both sleeves 0-rings.
3. After installation, the correct distance between the transmission harness connector and the housing surface (B) should not exceed 3 mm.
Important:
When installing the transmission harness connector, do use not excessive force - locking of the connector should not require an increased effort. This would be an indication of an incorrectly installed sealing sleeve!!!
4. If the distance between the connector and the transmission housing (A) measures approximately 7 to 8 mm, the sealing sleeve was installed incorrectly.
In such a case, an intermittent connection problem between Mechatronic and the vehicle harness connector will occur, resulting in various EGS communication faults (e.g., FC 5079 "Serial wire message missing"; FC 507A "Serial line signal plausibility"; "Gearbox Emergency Program" lamp illumination; and the transmission entering a failsafe mode).
5. In some cases, the incorrectly installed sealing sleeve may permanently damage pins in the Mechatronic connector (X8500). In such a case, the Mechatronic module has to be replaced (pin repair is not possible).
The illustration shows an example of a broken and missing pin #4 in the X8500, caused by improper sleeve installation; this resulted in the customer's complaint about the inoperative Sport Mode of the transmission.
IMPORTANT:
Damage to the Mechatronic connector (X8500) pins, caused by an improper installation on the sealing sleeve and a subsequent Mechatronic replacement, is not covered under the BMW warranties.
6. [NEW] Clean the groove in the plastic oil pan before gasket installation. When reinstalling the oil pan, make sure that the sealing surface of the gasket is oil-free.
Important:
If the sealing surface is not completely dry, the oil pan may still appear to exhibit a minor leak. Follow the attached torque sequence and specification of 10 Nm (REP24 34 020).
IMPORTANT NOTE:
It is not necessary to replace the transmission oil pan during this repair.
The design of the plastic transmission oil pan incorporates a contact surface "crown" which may give an impression of a "warped" pan. The designed surface parallelism may deviate up to 4 mm.
For this reason, following the correct oil pan screws torque sequence is critical to achieve proper gasket/pan sealing. Refer to the diagram.
Transmission oil pan replacements claimed under warranty for the reason described above will be either denied or debited, as applicable.
7. On vehicles equipped with a plastic oil pan (all with the exception of the E53), replace the drain plug. Follow the torque specification from REP 24 34 020.
8. Check and top up the transmission fluid level using Shell M-1375.4. For the filling procedure, refer to REP 00 11 500.
Note:
Up to 1 liter of Shell M-1375.4 transmission fluid can be claimed for topping up the transmission fluid level.
9. Warm the engine and test drive the vehicle to verify the effectiveness of the repair.
PARTS INFORMATION
[NEW] WARRANTY INFORMATION