The spring and damper assembly consists of a damper with a coil spring located on a welded spring seat on the damper tube. The lower end of the damper body locates in the wheel knuckle and is clamped with a nut and bolt. Depending on vehicle specification, the damper is either a conventional damper or a MagneRide damper. The conventional damper functions by restricting the flow of hydraulic fluid through a piston in the damper. The MagneRide damper also functions by restricting the flow of a fluid through the piston, but instead of hydraulic fluid it contains a fluid whose flow properties change when subjected to a magnetic field, which enables the damping rate to be varied.
The damper rod is located through a central hole in the top mount assembly. The rod is threaded at its outer end. A self-locking nut secures the damper rod to the top mount. A spring aid is fitted to the top mount bearing to prevent the damper contacting the top mount during full suspension compression, and also to assist the suspension tune. There are different spring aids for conventional and Magneride dampers. The damper rod is sealed at its exit point from the damper body to retain the fluid within the unit and to prevent the ingress of dirt and moisture. The seal also incorporates a wiper to keep the rod clean. A boot is fitted between the damper body and the top mount and protects the damper piston rod from damage.
The coil spring fitted differs with vehicle specification. Each spring is color coded to identify its rating and fitment requirements. The lower end of the coil spring is located in a spring seat which is an integral part of the damper body and contains a spring isolator. The design of the spring seat prevents the spring rotating. The spring has a linear rate compression and is inclined to counter cornering forces. The opposite end of the coil spring is also located in a spring isolator which is fitted in
the top mount bearing assembly. Both spring isolators are made from rubber and reduce any noise, produced during damper and spring compression/extension, from being transmitted to the vehicle body.
The top mount bearing is pressed onto the top mount. The top mount bearing reduces steering resistance by preventing the spring from ‘winding’ up when the steering in turned. The top mount attaches to the suspension turret with three bolts. Two brackets are welded to the damper body. One bracket provides for the attachment of the stabilizer link. The second bracket provides for the attachment of the brake hose, the wheel speed sensor cable and, on vehicles with dynamic suspension, the MagneRide damper cable. This bracket also positively locates the damper into the wheel knuckle and its location is critical to controlling the vehicle trim height.
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