4.1. Maintenance

Possible malfunctions of a suspension bracket and ways of their elimination

Periodically check a condition of springs, springs and shock-absorbers, their fastening and eliminate the revealed malfunctions.

Fig. 236. Forward suspension bracket: 1 – laying is vibration-absorbing; 2, 17 – spring arms;
3 – shock-absorber; 4, 21 – hinges rubber-metal; 5, 10 – nuts; 6 – step-ladder; 7, 8 – plugs rubber; 9, 16 – arms of the longitudinal lever; 11 – washer; 12 – hinges rubber; 13 – stabilizer arm; 14 – stabilizer; 15 – longitudinal bar; 18 – spring; 19 – buffer; 20, 23 – arms of cross draft; 22 – cross draft

It is necessary to check fastening of nuts of hinges of longitudinal bars and cross draft. The moment of an inhaling of nuts 5 (see fig. 236) a longitudinal bar and nuts of cross draft of 140-160 N · m (14–16 kgfs · м). A nut 10 tighten against the stop washers 11 in a fillet of a longitudinal bar, then a zashplintuyta.
On springs and sheets of springs cracks are not allowed. The cut of a center bolt of a spring can cause the longitudinal shift of sheets, and weakening of an inhaling of step-ladders – the cross shift of sheets.
Knocks and scratches in eyes of springs and hinges of a spring suspension bracket indicate wear of rubber plugs or their incomplete inhaling. In this case replace plugs or tighten them more densely. For increase in a tightness install in plugs of springs between them rubber laying (rings) which are cut out from the camera of the tire.
Sign of malfunction of shock-absorbers is long rocking of the car after moving through roughness of the road.
At service of shock-absorbers periodically examine and in due time tighten their fastening, check a condition of rubber plugs in ears.
The shock-absorber in time of operation of special adjustments does not demand.
You carry out dismantling of shock-absorbers only in the following cases:
– at emergence of a nonremovable leak of liquid;
– losses of efforts of the shock-absorber at stretching or compression;
– need of replacement of liquid.
Without special need it is not necessary to disassemble the shock-absorber.
Before than to disassemble the shock-absorber, clear it of dirt, carefully wash out and wipe. Carry out operations of dismantling and the subsequent assembly in the conditions of full purity.

Fig. 238. Shock-absorber: 1 – eye; 2 – compression valve limiter; 3 – compression valve case; 4 – compression valve; 5 – inlet valve; 6 – tank; 7 – cylinder; 8 – return valve; 9 – piston; 10 – perepuskny valve; 11 – rod; 12 – casing;
13 – the directing rod plug; 14 – lower sealing ring; 15 – epiploon; 16 – top sealing ring; 17 – holder of epiploons;
18 – tank nut; 19 – washer; 20 – protective ring; 21 – rod epiploon; 22 – the release buffer (only for forward shock-absorbers)

After the first 3000 km of a run or at dribble of liquid through an epiploon 15 (see fig. 238) a rod and sealing rings 14, 16 tighten a nut 18. The moment of an inhaling of 80-100 N · m (8–10 kgfs · м). If dribble do not stop, remove the shock-absorber, sort, examine sealing rings and an opening of the directing rod plug 13. Replace the rod epiploons which are worn out on internal diameter, a rod guide, sealing rings of the tank and other details. 15 establish a rubber epiploon by the inscription "bottom" which is available on it to the piston. At installation of an epiploon grease its internal surfaces interfaced to a rod with damping liquid for reduction of wear and the prevention of a scratch.
Decrease in efficiency of operation of the shock-absorber or refusal in work can be caused by a contamination of valvate systems, draft of springs of valves or breakage of details. In such cases disassemble the shock-absorber, wash out and replace the sunk or broken springs and other details.