How to Use a Torque Wrench?
2 Answers
When using a torque wrench, first select a torque wrench with an appropriate range according to the requirements of the workpiece to be measured. To preset the torque value, pull down the locking ring on the wrench handle while rotating the handle to adjust the main scale line value to the desired torque value. Ensure that the torque wrench is securely connected to the fastener and locked, and confirm that the connection is correct before adjusting the twisting direction. Fit the socket of the torque wrench over the fastener, then apply force slowly on the handle.
Before using a torque wrench, first consult the vehicle repair manual to find the standard torque value for the screw, usually measured in Newton-meters. Select a wrench that matches this range. I prefer to hear three clicks when adjusting the scale ring to confirm it's locked. The socket must be inserted vertically onto the screw, and use your left hand to steady the socket to prevent stripping. Push the handle evenly and steadily, and stop immediately when you hear a distinct click from the wrench—never apply extra force. Last time, I applied just a bit more force on a cylinder head screw and ended up stripping it. After use, always reset the scale to the minimum setting for storage, and on humid days, spray some rust inhibitor and wipe it clean. High-precision wrenches should be calibrated every six months—the veteran mechanic at the shop says this is crucial for protecting the precision gears. When working on aftermarket parts, it's better to double-check the torque setting three times than to skip it for convenience.
