32 11... Notes on checking steering backlash on vehicles with rack-and-pinion steering (with front axle raised)

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2010 BMW M6, 2010 BMW 650i, 2009 BMW M6, 2009 BMW 650i, and 2008 BMW M6. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: When the front axle is raised, the applied force is distributed via the tie rod into horizontal and vertical forces. If there is now no electric or hydraulic assistance, the forces created cause the thrust member (1) to be unloaded against the spring (2). The play created in this way is incorrectly referred to as steering backlash. 3 = Rack

Fig 1: Forces Created Cause Thrust Member (1) To Be Unloaded Against Spring (2)

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Target status: steering must be free from play in all the mechanical components (except for steering gear and tie rod)!

NOTE: For checking purposes, the steering gear must be pressurized by means of electric or hydraulic assistance.

Hydraulic steering assistance: Start engine.
Electro-hydraulic steering assistance: Switch ignition on.
Electric steering assistance: Turn on ignition and start engine.