Which of the following is NOT a cause of excessive steering looseness?

Excessive steering looseness in a vehicle can arise from various mechanical issues within the steering system. The correct answer — loose power steering belt — is not a direct cause of excessive steering looseness. While a loose power steering belt may lead to insufficient power assist or a loss of power steering capability, it does not inherently result in the looseness of the steering mechanism itself.

On the other hand, a loose sector shaft adjustment refers to the degree of tightness in the connection between the steering gear and the steering column. If this adjustment is not tight enough, it creates more play in the steering, leading to excessive looseness. Worn linkage components can also contribute to steering looseness by allowing movement and slop where none should exist, making the steering feel vague. Excessive gear worm end-play, which refers to the axial play in the steering gear, can similarly result in steering that feels loose and unresponsive, as it allows for increased movement of the steering wheel without corresponding movement of the wheels.

In summary, while the power steering belt is crucial for the operation of power-assisted steering, it does not directly affect the tightness or looseness of the steering mechanism itself.