xDRIVE
xDrive is a new four-wheel-drive system that delivers continuously variable input torques to the front and rear axles. xDrive comprises Dynamic Stability Control (DSC) and an electronically controlled multi-plate clutch in the transfer case. The DSC triggers the electronically controlled multi-plate clutch to supply continuously variable and power-oriented input torques to the front and rear axles. The rear axle is always powered. All of the input torque is applied to the rear axle when the multi-plate clutch is separated. See OVERVIEW - X-DRIVE article.
TOPPING UP/CHANGING TRANSFER CASE OIL
Note. Use only the approved gear oil in the transfer box. See TRANSFER CASE APPROVED OIL . Failure to comply with this requirement will result in serious damage to the transfer box. Only change the oil when the transfer box is at normal operating temperature.
| Oil Type | Part Number |
|---|---|
| Shell Gear Oil | 83 220 306 816 |
TRANSFER CASE APPROVED OIL
CHECKING/CORRECTING TRANSFER CASE OIL LEVEL
Note. Numbers in text refer to numbers in figures.
Undo oil filler plug (1). Check transfer case oil level. If necessary, pour in gear oil up to lower edge of opening for oil filler plug (1). (Scheme 7) Replace sealing ring. See TORQUE SPECIFICATIONS.
CHANGING TRANSFER CASE OIL
Note. Numbers in text refer to numbers in figures.
Place oil collecting apparatus underneath vehicle. Remove oil drain plug (2). (Scheme 7) Drain and dispose of gear oil.
Replace sealing ring, screw in oil drain plug (2) and tighten down. See TORQUE SPECIFICATIONS .
Undo oil filler plug (1). Pour in gear oil up to lower edge of opening for oil filler plug (1). Replace sealing ring, screw in oil filler plug (1) and tighten down. See TORQUE SPECIFICATIONS .
Scheme 7
REMOVAL & INSTALLATION
Note. Numbers in text refer to numbers in figures.
RADIAL SHAFT SEAL FOR FRONT AXLE OUTPUT
Remove front axle shaft. See AXLE SHAFTS article.
Press out output flange (1) with a suitable tool (2) in direction of arrow. (Scheme 8)
Scheme 8
Remove protective cap (1) with a screwdriver. (Scheme 9)
Scheme 9
Drive a hole into radial shaft seal (2) using a center punch (1). (Scheme 10) Do not use a drill as drillings may result in transmission malfunction.
Scheme 10
Screw in special tool (23 0 490). Drive out radial shaft seal (1) with impact weight (2). (Scheme 11)
Scheme 11
Drive in radial shaft seal with a suitable special tool (27 1 410). (Scheme 12) Add final details to vehicle. Check oil level.
Scheme 12
RESISTOR FOR SERVOMOTOR
Note. Numbers in text refer to numbers in figures.
Note. Delete previous resistance values when replacing the resistor. Using BMW diagnosis system, work through test program in accordance with instructions.
Release screws and remove transmission crossmember. (Scheme 13)
Scheme 13
Detach plug (1) from resistor. Release screw (2) and remove resistor. (Scheme 14)
Scheme 14
SERVOMOTOR (ATC 400 X-DRIVE)
Note. Delete previous resistance values when replacing the resistor. Using BMW diagnosis system, work through test program in accordance with instructions.
Remove complete exhaust system. See EXHAUST SYSTEM.
Remove heat shield. Release screws and remove transmission crossmember. (Scheme 13) Disconnect plugs (1 and 2). Release screws and remove servomotor from transfer box.
Scheme 15
TORQUE SPECIFICATIONS
| Application | Ft. Lbs. (N.m) |
|---|---|
| Drain Plug | 24 (33) |
| Servomotor To Transfer Box | 16 (22) |
| Transfer Case To Transmission | 32 (43) |
| Transmission Crossmember To Rubber Mounts | 53 (72) |
| Transmission Crossmember To Body | 15 (21) |
| Vibration Damper To Transfer Box | 15 (20.5) |
| INCH Lbs. (N.m) | |
| Resistor To Transfer Case | 17-44 (2-5) |
TORQUE SPECIFICATIONS