Replacing Expansion Tank GS6S53BZ (SMG)

WARNING: This page is about a different car, the 2005 BMW 645Ci, 2005 BMW 545i, 2004 BMW 645Ci, and 2004 BMW 545i. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: After completing work, check fluid level in hydraulic system by means of DIS Tester "Service Function". Perform "Teach in transmission" service function by means of DIS Tester.

Disconnect battery. See INSTRUCTIONS FOR DISCONNECTING AND CONNECTING BATTERY .

Remove underbody protection. Release exhaust system at front and lower. See REMOVING AND INSTALLING COMPLETE EXHAUST SYSTEM (N62) .

Remove heat shields (1) on left and right. See Fig 1 .

Fig 1: Removing Heat Shields

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Support transmission, release screws (1) and nuts (2) and remove transmission cross-member. See Fig 2 . Upon installation, tighten fasteners to specification. See TORQUE SPECIFICATIONS . Lower transmission.

Fig 2: Removing Transmission Cross-Member

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1). See Fig 3 . Remove expansion tank (2) in direction of arrow. Upon installation, replace both sealing rings. Grease sealing rings. Tighten screws to specification. See TORQUE SPECIFICATIONS .

Fig 3: Removing Expansion Tank

Courtesy of BMW OF NORTH AMERICA, INC.