Lada Niva 4x4, Руководство по обслуживанию

Страница: 53 / 81

- remove the front wheel hub in assembly with the brake disc,
using pusher 67.7823.9516;
- remove the front brake splash guard;
- remove the front suspension shock-absorber;
- lower the suspension lower arm on a support and compress
the suspension spring to fully unload the lower arm;
- disconnect the balljoint housing from the suspension lower
and upper control arms and remove the steering knuckle;
- smoothly unload the suspension spring and take it off;
- using pusher 67.7823.9515 knock out the shaft and discon-
nect the suspension lower arm from the crossmember;
- disconnect the upper arm shaft from the crossmember and
remove the shaft in assembly with the control arm;
Note. Before removing the upper and lower arm shafts count
the amount of washers on each end of the lower arm shaft and
on the fastening bolts of the upper arm shaft, so that to refit them
in former places.
- remove the recoil bumper bracket and the crossmember, as
described above;
- using puller 67.7824.9516, press out the balljoint pins from
the steering knuckle.
The front suspension components are shown on fig. 4- 7.
The reassembly of suspension units is carried out in
reverse sequence. When reassembling the wheel hub, grease
the bearing cages with ãàíéã-24 and put a thin layer in the cav-
ity of the steering knuckle between the bearings in the amount of
40 gr in each knuckle.
When refitting the crossmember tie rods, the inner nut should
be tightened until the clearance between the washer and the
bracket 3 (see fig. 4-6) will be taken up, and the outer one - with
torque specified in the appendix.
To avoid wrong force distribution in silent blocks, the arm
shaft nuts should be tightened under vehicle static load of 3140N
(320 kgf). Then check and adjust the wheel alignment angles and
toe-in.
Inspection
Balljoint.
Ensure the integrity of the balljoint boots; no
breaks, cracks, rubber peeling from the metal fixture, traces of
grease leaks are permissible.
Check for wear of balljoint working surfaces by manually
turning the ballpin. No free play or pin jamming is allowed.
A more profound check of the balljoint radial and axial clear-
ances is carried out on fixture 02.8701.9502. Place the balljoint 1
(fig. 4-8, Ä) in the fixture bezel and fix with screw. Fit in the fix-
ture bracket indicator 2 so that the indicator leg will rest against
the side surface of the balljoint housing, the indicator arrow
should point to zero.
Fit the dynamometer 3 in the fixture bezel and apply torque
of 196 N•m (20 kgf•m) in both directions, determine by indicator
2 the total radial clearance in the balljoint. If it exceeds 0.7 mm -
renew the joint.
Make the similar check of the balljoint axial clearance, previ-
ously having changed its fastening in the fixture, as shown on fig.
4-8, B. The axial clearance in the joint should not exceed 0.7 mm.
Suspension springs. Carefully examine the springs. If any
deformations affecting the spring efficiency will be found - renew
the springs.
To check the spring set down, fully compress it three times.
The spring compression is made along the spring axis; the bear-
ing surfaces should meet the vehicle suspension spring seats.
Then apply load of 6.276 N (640 kgf). According to the spring
length (see fig. 4-9) under the specified load the springs are
divided into two classes: class A - length more than 192 mm, and
class B - length is equal to or less than 192 mm. The springs of
A class can be not marked or have marks with white paint on the
external side of coils, spring of B class are marked with black
paint.
On the front suspension the springs of the same class, as
those on the rear suspension, should be installed. As an excep-
tion, when on the rear suspension the springs of B class are
installed, and there are no springs of the same class available for
108
Fig. 4-8. Inspecting the balljoint on fixture 02.8701.9502:
1 - balljoint; 2 - indicator; 3 - dynamometer; 4 - fixture 02.8701.9502; A - method
of checking the radial clearance; B - method of checking the axial clearance Fig. 4-9. Main parameters for checking the front suspension coil spring