basic components of a typical strut assembly, are as
follows (fig. 8-9):
STRUT SHOCK ABSORBERpiston-
operated oil-filled cylinder that prevents coil
DUST SHIELDmetal shroud or rubber boot
that keeps road dirt off the shock absorber.
LOWER SPRING SEATlower mount formed
around the body of the shock absorber for the
COIL SPRINGsupports the weight of the
vehicle and allows for suspension action.
UPPER STRUT SEATholds the upper end of
the coil spring and contacts the strut bearing.
STRUT BEARINGa ball bearing that allows
the shock absorber and coil spring assembly to
rotate for steering action.
RUBBER BUMPERSjounce and rebound
bumpers which prevent metal-to-metal contact
during extreme suspension compression and
RUBBER ISOLATORSparts of the strut
damper which prevents noise from being
transmitted into the body structure of the
UPPER STRUT RETAINERmounting that
secures the upper end of the strut assembly to the
frame or unitized body.
In a MacPherson strut type suspension, only one
control arm and a strut is used to support each wheel
assembly. A conventional lower control arm attaches
to the frame and to the lower ball joint. The ball joint
holds the control arm to the steering knuckle or bearing
support. The top of the steering knuckle or bearing
support is bolted to the strut. The top of the strut is
Figure 8-9.Exploded and cutaway views of a strut assembly.