When should a torque wrench be used according to the repair manual?

Using a torque wrench as indicated in the repair manual is crucial for ensuring that all fasteners are tightened to the manufacturer's specified torque. This practice is essential because each fastener in an engine has a specific torque specification that accounts for its size, material, and application.

When the torque is applied correctly, it helps ensure proper clamping force, which is vital for the integrity of the connections. Under-torquing can lead to fasteners coming loose under vibration or thermal cycling, while over-torquing can cause damage such as stripping threads or breaking the fastener. Following the repair manual's guidelines helps maintain the engine's reliability and performance, ensuring that all components function correctly together.

Using a torque wrench on all specified fasteners, as the repair manual directs, not only promotes uniform tension but also reduces the likelihood of failures due to improper assembly. It reflects good mechanical practice to adhere strictly to these specifications to ensure optimal results in maintenance and repairs.