15.2 Front Axle Faults
WARNING: This page is about a different car, the 2007 BMW 550i and 2006 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.
FRONT AXLE FAULTS SPECIFICATIONS
| Fault | Cause | Remedy | |||
|---|---|---|---|---|---|
| 1. | Toe deviation | a) | Vehicle not in normal position | a) | Correct height level |
| b) | Tie rod(s) bent | b) | Replace tie rod(s) | ||
| c) | Tie rod ball joints worn | c) | Replace tie rod(s) | ||
| d) | Rubber mount in control arm defective | d) | Replace control arm | ||
| 2. | Camber deviation: The camber is fixed during the design stage and cannot be adjusted. | a) | a) Rubber mount in control arm defective | a) | Replace control arm |
| b) | Control arm deformed | b) | Replace control arm | ||
| c) | Spring strut deformed | c) | Replace spring strut | ||
| d) | Traction strut worn | d) | Replace control arm | ||
| e) | Spring deflection too great | e) | Replace coil spring, height level | ||
| f) | Front axle carrier deformed | f) | Replace front axle carrier | ||
| g) | Spring strut mount deformed | g) | Repair forward structure | ||
| h) | Distortion in the floor assembly (engine bracket) | h) | Repair body | ||
| 3. | Castor deviation: The castor is fixed during the design stage and cannot be adjusted. | a) | Rubber mount for tension / traction strut defective | a) | Replace rubber mount |
| b) | Tension / traction strut deformed | b) | Replace tension / traction strut | ||
| c) | Control arm deformed | c) | Replace control arm | ||
| d) | Spring strut deformed | d) | Replace spring strut | ||
| e) | Wheelhouse deformed (spring strut mount) | e) | Repair forward structure | ||
| f) | Distortion in the floor assembly (engine bracket) | f) | Repair body | ||
| 4. | Toe-differential angle deviation | Requirement: camber and castor are correct | |||
| a) | Tie rods unevenly adjusted | a) | Set wheel toe on left and right to identical values | ||
| 5. | Wheel displacement deviation | Requirement: Front wheels have same single toe in relation to the geometrical axis | |||
| a) | Front axle carrier deformed | a) | Replace front axle carrier | ||
| b) | Engine bracket deformed | b) | Repair body | ||
| c) | Control arm deformed | c) | Replace control arm | ||
| d) | Tension / traction strut deformed | d) | Replace tension / traction strut | ||