Topping up.

Process of making sure a fluid is full to the top or appropriate level marking.

Rotary or turning force. The SI unit of torque is Nm. The force in Newtons multiplied by the distance in metres.

A fluid flywheel with a stator that creates a back force in the turbine that is added to the force from the impellor to give an increase in output torque.

Values recommended by a manufacturer, to which certain fixings should be tightened.

A calibrated wrench that allows tightening and adjustment of fasteners to a specified torque setting.

Type of bolt used for holding cylinder heads. They are made from a steel alloy that allows a tough hold down force at the yield point of the material. These bolts usually require tightening by an angular value and replacement whenever they are removed.

A twisting force that results in torsional stress.

Metal spring used in vehicle suspension. Uses a twisting action along the length of the spring to provide suspension movement.

A spring that works by twisting.