Q:

How to detect a bad U-joint?

A:

A bad universal joint in a vehicle is detected by looking out for signs such as dust and excessive vibration in the prop-shaft. The U-joint cannot be dismantled in most current car models, as it is permanently joined to the prop-shaft, thus requiring the entire shaft to be changed.

  1. Look out for excessive vibration

    Excessive vibration in the prop-shaft is one indicator of a worn U-joint. Depending on the car model, the joint is lubricated or replaced, or the prop-shaft is replaced entirely.

  2. Look out for strange noises

    A clonking sound when accelerating or decelerating is another indicator of a bad joint. A regular knock when the car is in motion is also an indicator of a bad joint.

  3. Check for play in the joint

    There should be no play in the joint if it is in good condition. To check the condition of a U-joint, firmly grip one side of the joint and try to turn the other side. The joint should hold firmly if it is in good condition. Alternatively, insert a large screwdriver between the levering and yoke to see if there is any play. A new joint or prop-shaft needs to be fitted if any play is detected.

  4. Check for dust around the spider

    The presence of rust-colored dust around the spider is an indication of a faulty U-joint. Put in a new shaft or joint immediately when dust is detected around the spider.

Sources:

  1. howacarworks.com

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