for the rear suspension, it is permissible to install the B class
springs (with black marking). If on the front suspension the
springs of B class are installed, the rear suspension should be fit-
ted with B class springs only.
To avoid damage and excessive tightening of control arm
rubber bushes and shock-absorbers:
- load the rear part of the vehicle so that distance X, mea-
sured from the axle beam to the body chassis arm in 100 mm
from the cross bar bracket (fig. 4-16), will make 152 mm; use a
dynamometer to tighten the nuts on fastening bolts of the longi-
tudinal and cross bars , and the shock-absorbers fastening pins
on the axle beam and car body.
Inspection
Before inspection thoroughly wash all components.
Protect the rubber components, bushes and protective cov-
ers from solvents.
Springs. Check the tension characteristic of the spring on
control points (fig. 4-17), previously having depressed it to bring
the coils in contact.
Note. According to length under load of 3432 N (350 kgf) the
springs are divided into two classes: class A - length more than
278 mm, and class B - length equal to or less than 278 mm. The
springs of A class can be not marked or have marks with white
paint on the external side of coils, and class B - marked with
black paint on the external side of the coils.
Check for spring deformation. If the spring tension does not
correspond to the data on fig. 4-17 or the deformation can affect
spring efficiency, renew it.
Inspect the spring rubber gaskets; if necessary - renew.
Arms. Check for:
- arm deformation; straighten if possible;
- cracks on rear axle beam brackets and body; overhaul the
brackets in case of cracks;
- the arm joint rubber bushes; if necessary - renew, using a
set of fixtures 67.7820.9517.
Shock-absorbers
The design of shock-absorbers of front and rear suspensions
is shown on fig. 4-18.
Shock-absorbers bench-test
To test the efficiency of the shock-absorber, make an oper-
ating diagram check on a dynamometer bench.
The working diagram is made according to the instruction
attached to the test-bench, after no less than 5 working cycles, at
the shock-absorber liquid temperature of (20±5) °C, the flywheel
111
Fig. 4-16. Rear suspension mounting:
1 - chassis arm; 2 - transverse arm bracket; 3 - rear axle beam; X = 152 mm
Fig. 4-15. Rear suspension, exploded view:
1 - lower longitudinal arm; 2 - rubber bush; 3 - bracket; 4 - spacer sleeve;
5 - upper longitudinal arm; 6 - additional compression buffer; 7 - spring;
8 - spring seat, upper; 9 - compression buffer; 10 - spring insulating gasket,
upper; 11 - shock absorber; 12 - spring insulating gasket, lower; 13 - transverse
arm
Fig. 4-17. Main parameters for checking the rear suspension spring
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