Lada Niva 4x4, Руководство по обслуживанию

Страница: 49 / 81

104
Before adjusting the wheel alignment angles check the fol-
lowing:
- pressure in tyres;
- axial gap in front wheel hub bearings;
- serviceability of shock-absorbers (absence of rod jamming);
- radial and axial runout of tyres;
- gap in suspension balljoints;
- free play of steering wheel.
Rectify any detected malfunctions and make necessary
adjustments.
After placing the vehicle on a test-bench, immediately prior to
inspection, apply 2 or 3 times a downward force of 392-490 N
(40-50 kgf) first on the rear bumper and then on the front one.
The wheel alignment angle should be checked and adjusted
in the following sequence:
1. Caster angle
2. Camber angle
3. Toe-in
Caster angle
. If the check will show that the angle size does
not correspond to the above data, it is necessary to change the
quantity of adjusting washers 50 (see fig. 4-1) between the upper
arm shaft and the crossmember arm (see tab. 4-2).
Table 4-2
Camber and caster angle vs. number of washers in a set
Number of washers added
to the set or withdrawn camber caster
front bolt rear bolt
+1 +1 + (8' 42'') 0
-1 -1 - (8' 42'') 0
+1 0 - (7' 30'') + (20' 24'')
-1 0 + (7' 30'') - (20' 24'')
0 +1 + (15' 18'') - (25' 18'')
0 -1 - (15' 18'') + (25' 18'')
-1 +1 + (27' 30'') - (43' 18'')
+1 -1 - (21' 36'') + (40')
Note. Data are given for washers with thickness of 0.75 mm.
Plus - adding a washer, minus - removing a washer.
To adjust the caster angle:
- undo the fastening nuts of the front suspension upper arm
shaft and replace the washers from one bolt to the other one until
a normal reading of the angle will be obtained. The caster angle
increases at rearrangement of washers from the rear bolt to the
front one and decreases at reverse swapping;
- tighten the nuts with a torque wrench and check the caster
angle.
Front wheel camber. If the camber angle differs from nor-
mal, it should be adjusted by changing the amount of washers 50
(see fig. 4-1) between the upper arm shaft and crossmember
bracket.
To reduce the camber angle remove the same amount of
washers from both bolts, and to increase - add.
Front wheel toe-in. If the toe-in differs from normal value, it
is necessary to slacken the fastening clamps on the side tie-rods
and using tool 67.7813.9504 identically turn both adjuster pins in
opposite directions; thus the pins are turned on or off and change
the length of side tie-rods.
Fig. 4-2. Inspection of the front suspension arm silent block:
1 - rubber bush; 2 - outer bush; 3 - shaft securing nut; 4 - suspension arm shaft;
5 - thrust washer; 6 - inner bush
Fig. 4-3. On-vehicle check of the clearance in the suspension upper
balljoint:
1 - upper control arm; 2 - indicator; 3 - upper balljoint housing; 4 - indicator fas-
tening bracket; 5 - control arm; 6 - dynamometer; 7 - block