Who is right: Technician A or Technician B?

Explanation:

Impact Wrenches Usage:

Impact wrenches are essential tools in the automotive industry for loosening tight bolts and nuts. Both technicians have valid points, but in specific scenarios.

Technician A's Statement:

Technician A is correct in stating that when removing a bolt from the front of an engine's crankshaft using an impact wrench, the crankshaft must be held to prevent it from turning. This is crucial in situations where precision is needed, especially when working with critical engine components. Impact wrenches generate a high amount of torque, and without holding the crankshaft in place, it can easily rotate, causing potential damage.

Technician B's Statement:

Technician B mentions that when using an impact wrench to remove lug nuts on a raised vehicle, the brakes must be applied. While applying the brakes can provide extra stability, it is not a strict requirement when using an impact wrench for this task. In most cases, the weight of the vehicle and the friction between the tire and the ground are sufficient to prevent the vehicle from moving during the lug nut removal process.

Final Verdict:

Therefore, the correct answer is neither Technician A nor Technician B. The use of an impact wrench may vary depending on the specific application and the level of control needed. Impact wrenches are commonly used for tasks like exhaust bolts and wheel nuts, where they can make the job faster and more efficient. It's essential to follow proper safety procedures and guidelines when using an impact wrench to ensure the best results and prevent accidents.