Land Rover Discovery Owners & Service Manuals

Land Rover Discovery: Lower Control Arm and Tie Bar

Lower control arm and tie bar

  1. Flag nut retaining screw
  2. Flag nut - lower control arm to wheel knuckle
  3. Bush - lower control arm to wheel knuckle
  4. Bolt - lower control arm to wheel knuckle
  5. Lower control arm
  6. Bolt (front) - lower control arm to subframe
  7. Bush (front) - lower control arm to subframe
  8. Bush (rear) - lower control arm to subframe
  9. Bolt (rear) - lower control arm to subframe
  10. Bolt - link - lower control arm to wheel knuckle
  11. Link - lower control arm to wheel knuckle
  12. Bush - link - lower control arm to wheel knuckle
  13. Nut - link - lower control arm to wheel knuckle
  14. Bolt - tie arm to wheel knuckle
  15. Bush - tie arm to wheel knuckle
  16. Nut - tie arm to wheel knuckle
  17. Nut - toe adjustment - tie arm to subframe
  18. Washer - toe adjustment - tie arm to subframe
  19. Tie arm
  20. Bush - toe adjustment - tie arm to subframe
  21. Bolt - toe adjustment - tie arm to subframe

Lower control arm

The lower control arm is cast aluminum with a bushes pressed into the inner section of the arm which provides for the attachment to the subframe. The bushes are located between brackets on the subframe and secured with bolts and nuts. The lower control arm has a platform which provides for the attachment for the coil spring and a location hole for the attachment of the stabilizer-bar link.

The outer section of the lower control arm has a second bush which attaches to the forward end of the wheel knuckle. A bush at the rearward end of the lower control arm attaches to the wheel knuckle's rear bush by links which provides castor control.

Tie Arm

The tie arm is pressed steel with one end having a bush pressed into a machined bore.

The inner bush locates between brackets on the subframe and is secured with a special eccentric bolt, washer and nut. This allows for the adjustment of the rear wheel toe. Rotation of the bolt moves the eccentric head within a recessed slot in the bracket, allowing the toe to be adjusted within the set limits.

WHEEL KNUCKLE, WHEEL HUB AND BEARING ASSEMBLY

WHEEL KNUCKLE, WHEEL HUB AND BEARING ASSEMBLY

  1. Bush - link - lower control arm to wheel knuckle
  2. Wheel knuckle
  3. Brake caliper location
  4. Bush - lower control arm to wheel knuckle
  5. Bearing - wheel hub
  6. Circlip - wheel hub bearing
  7. Wheel hub
  8. Wheel stud
  9. Nut - wheel hub
  10. Bush - wheel knuckle to tie arm

The rear wheel knuckle is an aluminum casting which provides for the attachment of the rear upper and lower control arms and the tie-rod. The rear wheel knuckle also provides the mounting locations for the wheel hub and bearing assembly.

The hub assembly comprises a wheel hub and a drive flange. A bearing is fitted in the wheel hub and is secured with a circlip. It is first pressed into the knuckle with a circlip added to secure it; the hub is pressed into the bearing. The drive flange has wheel studs attached to it and locates on the splined drive shaft and is secured with a stake nut.

STABILIZER BAR AND LINKS

STABILIZER BAR AND LINKS

  1. Nut - stabilizer bar link to lower control arm
  2. Stabilizer bar link
  3. Nut - stabilizer bar link to stabilizer bar
  4. Bush - stabilizer bar to subframe
  5. Bracket - stabilizer bar to subframe
  6. Bolt - stabilizer bar bracket to subframe

The stabilizer bar is fabricated from hardened steel tube. The stabilizer bar operates, via a pair of links, from their attachment to the wheel knuckles.

The stabilizer bar is mounted on the subframe's rear cross member and is attached with two, compression rubber bushes which wind up torsionally in operation. Brackets, which are pressed onto the bushes, are attached to the cross member with bolts. The stabilizer bar has aluminium moulded, 'antishuffle' collars positioned on the inside edges of the bushes. The collars prevent sideways movement of the stabilizer bar.

The links have a ball joint at each end, are fitted with hardened steel washers pressed onto the ball-pins at both ends. The bottom ball joint is attached to the link at 90 degrees to the link axis. The ball joint is located in a hole in the wheel knuckle and secured with the hardened steel washer on one side of the interface and a self-locking nut on the other. The top balljoint is located in a hole in the end of the stabilizer bar and secured with the hardened steel washer on one side of the interface and the self-locking nut on the other.

Rear suspension specifications

Coil Spring Suspens

Coil Spring Suspens

Road Spring Identification

CAUTION:

Do not remove the rubber isolators form the spring. A new spring is installed with the correct isolators.

Road Spring Identification

Road Spring Identification

To maintain the correct vehicle ride height, make sure that the correct coil spring is fitted.

The coil springs should be fitted as a pair.

Always carry out the vehicle ride height check and after fitting a new coil spring.

Torque Specifications

Torque Specifications

Torque Specifications

* New nuts must be installed

** New nuts and bolts must be installed

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