Engine Building Fundamentals: Torque Wrench
- The fasteners inside the engine are some of the most critical that you'll find anywhere on a car, and it's essential to make sure they are correctly tightened to the manufacturer's specifications.
The most common way of achieving this will be with a torque wrench that will indicate when a specific torque value has been reached.
Torque wrenches are available in a variety of sizes and measurement ranges, and depending on the range of torque values you need to work with it's possible you'll need more than one.
A torque wrench that can measure the 200 foot-pound of torque that you might use to torque up a crank-pulley bolt is probably not going to be able to measure down as low as a torque of, perhaps, 10 foot-pound, for example.
It's important that the torque wrench that you are using gives a clear and obvious indication when the torque preset has been reached.
This might be by way of an audible click, a buzzer, or the torque wrench might vibrate, but it's important to know your particular wrench and how it works.
Most torque wrenches will offer dual signals such as a noise and a vibration you can feel, so that the torque wrench can still be used in a noisy environment.
Some of the more expensive torque wrenches include the ability to set the desired torque on a digital screen, as well as the ability to easily change between metric and imperial units.
Some of these torque wrenches also include the ability to measure angle, which makes it quicker and easier to quickly tighten fasteners that call for a torque angle method.
You need to weigh up the fact that these electronic torque wrenches will come at a higher price tag though.