What does a torque wrench do?

A torque wrench is a specialized tool designed to apply a specific amount of torque to a fastener, such as a bolt or nut, ensuring that it is tightened to the manufacturer's specifications. This is crucial in engine repair and assembly because using the correct torque prevents over-tightening or under-tightening, which can lead to mechanical failures, leaks, or damage to components.

Understanding torque is essential in maintaining the integrity of engine parts and ensuring they are securely fastened without causing stress or warping. The tool allows the user to set a precise torque level, providing a clear indication when the desired torque is reached, often through a click or a visual gauge.

Other options listed do not pertain to the function of a torque wrench. Measuring oil pressure, adjusting fuel injection timing, and checking battery voltage are performed using different tools and instruments, each serving a specific purpose in vehicle maintenance and repair.