ASE A4 Suspension and SteeringSteering System Diagnosis and RepairHard
A technician is diagnosing a vehicle with a manual steering gearbox that exhibits excessive free play at the steering wheel. The technician confirms that all steering linkage components (tie rod ends, drag link, pitman arm, idler arm) have no discernible play. What is the MOST likely cause of the excessive free play?
- AA worn steering column universal joint.
- BIncorrect adjustment of the steering gearbox preload.
- CA bent steering shaft.
- DWorn internal components within the steering gearbox.
Show answer & explanationAnswer & explanation
Correct answer: D. Worn internal components within the steering gearbox.
If all external steering linkage components are good and the steering gearbox preload is correctly adjusted (or ruled out), then excessive free play in a manual steering system points to internal wear within the steering gearbox, such as wear in the sector shaft, worm gear, or bearings.
Why the other options are wrong
- A. A worn steering column universal joint would cause play or binding in the column itself, but the question focuses on the gearbox and linkage being free of play.
- B. Incorrect adjustment of the steering gearbox preload can cause play, but the question implies a more fundamental issue if all external components are good, and preload adjustments often only compensate for minor wear, not significant play.
- C. A bent steering shaft would likely cause binding or a consistent off-center steering wheel, not just excessive free play with otherwise good linkage.
Manual Steering Gearbox Internal Wear
Excessive free play in a manual steering system, after ruling out external linkage and proper preload, indicates wear of internal components within the steering gearbox.
- Excessive steering wheel free play.
- External linkage components are good.
- Preload adjustment may not resolve significant play.
- Caused by worn internal gears or bearings.
Memory trick: Linkage fine, but wheel's too free? Gearbox insides, it must be!