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Steering knuckle and hub assembly - removal and refitting
Suspension and steering systems / Steering knuckle and hub assembly - removal and refitting


Removal
1 Apply the handbrake. Remove the wheel cover from the relevant front wheel, and loosen (but do not remove) the driveshaft/hub nut. This nut is very tight.

2 Loosen the front wheel nuts, jack up the front of the vehicle and support it on axle stands. Remove the front wheel.

3 Extract the split pin from the track rod end balljoint nut. Unscrew the nut, and detach the rod from the arm on the steering knuckle using a conventional balljoint removal tool.

Take care not to damage the balljoint seal.

4 Remove the ABS sensor (when fitted) as described in Chapter 9.

5 Remove the brake caliper and brake disc as described in Chapter 9, but do not disconnect the flexible hose from the caliper. Suspend the caliper from a suitable point under the wheel arch, taking care not to strain the hose.

6 Unscrew and remove the driveshaft/hub nut. Note that the nut is of special laminated design, and should only be re-used a maximum of 5 times. (It is a good idea to file a small notch on the nut every time it is removed.) Obtain a new nut if necessary.

7 Note which way round the lower arm balljoint clamp bolt is fitted, then unscrew and remove it from the knuckle assembly. Lever the balljoint down from the knuckle; if it is tight, prise the clamp open using a large flatbladed tool. Take care not to damage the balljoint seal during the separation procedure.

8 Unscrew and remove the pinch-bolt securing the steering knuckle assembly to the front suspension strut, noting which way round it is fitted. Prise open the clamp using a wedge-shaped tool, and release the knuckle from the strut. If necessary, tap the knuckle downwards with a soft-headed mallet to separate the two components. Support the knuckle on an axle stand.

9 Pull the steering knuckle and hub assembly from the driveshaft splines. If it is tight, connect a universal puller to the hub flange, and withdraw it from the driveshaft. When the driveshaft is free, support it on an axle stand, or suspend it from a suitable point under the wheel arch, making sure that the inner constant velocity joint is not turned through more than 18°. (Damage may occur if the joint is turned through too great an angle.) Refitting
10 Lift the steering knuckle and hub assembly onto the driveshaft splines, and support the assembly on an axle stand.

11 Locate the assembly on the front suspension strut. Insert the pinch-bolt with its head facing forwards. Fit the nut and tighten it to the specified torque.

12 Refit the lower arm balljoint to the knuckle assembly, and insert the clamp bolt with its head facing forwards. Refit the nut and tighten it to the specified torque.

13 Refit the driveshaft/hub nut, and tighten it moderately at this stage. Final tightening of the nut is made with the vehicle lowered to the ground.

14 Refit the brake caliper and brake disc as described in Chapter 9.

15 Where fitted, refit the ABS sensor as described in Chapter 9.

16 Reconnect the track rod end balljoint to the steering arm, and tighten the nut to the specified torque. Check that the split pin holes are aligned; if necessary, turn the nut to the nearest alignment, making sure that the torque wrench setting is still within the specified range. Insert a new split pin, and bend it back to secure.

17 Refit the front wheel, and lower the vehicle to the ground. Tighten the wheel nuts to the specified torque.

18 Tighten the driveshaft/hub nut to the specified torque, and refit the wheel cover.


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