Torsion Bar

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Leaf Spring

Construction Mechanic Basic Volume 2

Suspension Bushing Service

Torsion Bar
The torsion bar consists of a steel rod made of spring steel and treated with heat or pressure to make it elastic, so it will retain its original shape after being twisted. Torsion bars, like coil springs, are frictionless and require the use of shock absorbers. The torsion bar is serrated on each end and attached to the torsion bar anchor at one end and the suspension system at the other end (fig. 8-15). Torsion bars are marked to indicate proper installation by an arrow stamped into the metal. It is essential that they be installed properly because they are designed to take the stress in one direction only. The up-and-down movement of the suspension system twists the steel bar. The torque resistance will return the suspension to its normal position in the same manner as a spring arrangement.

Figure 8-14.- Bogie suspension.

Figure 8-15.- Torsion bar.

SUSPENSION SYSTEM SERVICE
A suspension system takes a tremendous "pounding" during normal vehicle operation. Bumps and potholes in the road surface cause constant movement, fatigue. and wear of the shock absorbers, or struts. ball joints, bushings, springs, and other components. Suspension system problems usually show up as abnormal noises (pops, squeaks, and clunks), tire wear, steering wheel pull, or front end shimmy (side-to-side vibration). Suspension system wear can upset the operation of the steering system and change wheel alignment angles. Proper service and maintenance of these components greatly increase roadability, reliability, and vehicle life.