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torque wrench is like a normal wrench in that it lets you tighten or loosen nuts and bolts on your car. But it can be set to tell you when youve tightened a nut to a particular amount, e.g. 9 foot lbs, so you dont tighten it too much and damage the threads on the nut.
The simplest form of
digital torque wrench consists of a long lever arm between the handle and the wrench head, made of a material which bends elastically in response to applied torque. A second, smaller bar with integral mechanical indicator is also connected to the head; this is never subjected to torque and thus maintains a constant position with respect to the head. When no torque is applied to the lever arm the indicator rests parallel to the lever arm. A calibrated scale is fitted to the handle so that applied torque, and the associated bending of the main lever, causes the scale to move under the indicator. When the desired torque is reached (as shown by the indicator), the operator stops applying force. This type of wrench is simple, inherently accurate, and inexpensive.
On the end of the torque wrench is a dial or other way of setting where you want to stop tightening, and usually a gauge to show you where its set. Twist the dial and watch the guage, it will gradually change to show a different pressure level. The wrench my dad has both metric and imperial measurements, make sure youre following the right one for what your guide says.
Look up in a manual how tight something should be, for instance the flywheel gland nut should be tightened to 220 Ft. Lbs. (30 Kg if you have a metric-only wrench.) Set the right level on the guage and start tightening up the nut. Dont try and do it all in one go, a gradual tightening is easier to control. When
dial torque wrench you hit the level you have set, the torque wrench will break - make a cracking noise and you can feel something inside the wrench giving way for a moment. Stop tightening now.
With many wrenches, you can keep tightening if you lean on the wrench, but this just means you are turning the nut further than you are supposed to and about to damage something.
If you are not sure if it is right, double check the setting on the torque wrench and try tightening the nut a little more. If the wrench breaks again, you have tightened the nut enough.
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