- signs of rubber aging;
- mechanical damage.
The following are not permitted on rubber-metal hinges:
- signs of aging, cracks;
- one-sided bulging of the rubber mass.
Replace defective parts.
Check for mechanical damage (deformations, cracks, etc.) suspension elements.
Figure 4.3. Rear suspension parts: 1 – rear suspension shock absorber; 2 – rear suspension beam; 3 – rubber-metal hinge; 4 – spring
The location of the rear suspension elements to be tested is shown in the figure 4.3.
When checking, carefully examine the following.
1. Rubber bushings of lower hinges…
2. …rubber-metal hinges of the rear suspension beam…
3. …shock absorbers (fluid leaks, "sweating" are not allowed).
Note: Pay attention to the exhaust system. The extraneous knocking sounds it makes are often mistaken for knocking in the rear suspension. The use of non-standard parts or breakage of suspension elements of the additional and main mufflers can cause a loud knock, especially when revving the engine. To check, stop the engine, carefully inspect the exhaust system, check the reliability of the fastening and suspension of the exhaust system. Taking hold of the end of the exhaust pipe (to avoid getting burned, wear gloves), rock the muffler up and down and from side to side - there should be no knocking.