Removal and repair of shock absorbers GAZ-2705
Shock absorbers are designed to dampen vehicle vibrations that occur when driving on rough roads
Their action is based on the use of resistance to fluid flow through small bore sections in compression and recoil valves.
The comfort of the car and the durability of body parts and chassis largely depend on the operation of shock absorbers.
Normally working shock absorbers should dampen the vibrations of the car after moving over an obstacle in 1-3 rolls.
If squeaks, knocks occur when driving off-road, then you need to check the condition of the shock absorbers.
Inspect shock absorber rod.
If the stem is bent or there are delaminations of the chrome coating on the working surface, traces of corrosion, scuffing, damage to the threaded part or wrench flats, then the shock absorber must be replaced.
Removing and installing shock absorber
Jack up and remove the front wheel of the car. If we are working on a viewing ditch, this can be omitted.
With the “19” head, unscrew the nut of the shock absorber lower mounting bolt.
Remove the outer washer.
We do the same with the upper shock absorber mount
Remove shock absorber
Remove the inner washers
Remove the rubber bushings from the shock absorber eye
We install a new shock absorber with new rubber bushings in reverse order. Similarly, we replace the shock absorber on the other side of the car.
Remove the rear suspension shock absorber in the same way.
Shock absorber repair
Disassembly of the shock absorber should only be done in case of obvious shock absorber failures.
The degree of disassembly depends on the nature of the malfunction. So, if tightening the tank nut did not rule out fluid leakage, then the shock absorber must be partially disassembled.
In figure 8, the key for repairing the shock absorber.
Disassemble shock absorbers in the following order:
- - clamp the lower eye in a vice, extend the stem 1 (see Fig. 1) beyond the failure and unscrew the nut 4 of the tank;
- - carefully swing the sleeve 5 of the stuffing box 6 by the rod 1 and lift the cylinder 11 out of the reservoir;
- - holding the cylinder with one hand and without removing it from the tank, use a copper hammer to knock out the guide 9 of the rod from the cylinder;
- - lower the cylinder to the bottom of the tank and, holding it, remove the piston rod 14; drain the liquid from the tank and cylinder into a measuring cup;
- - remove the cylinder from the reservoir and, holding the lower part of the compression valve body 19 in a vice, swing the cylinder and release it from the valve body.
As a rule, the compression valve is not disassembled, but only thoroughly washed with kerosene and pressed into the cylinder in its original place.
If it is necessary to disassemble it, unscrew the nut 23;
- - clamp the stem in a vice by the upper eye and unscrew the nut 17 of the recoil valve, remove in succession the restrictive plate 16, discs 15, piston 14, plate 13, spring and restrictive plate 12. the rest of the liquid - into the reservoir.
Remove the cylinder from the reservoir and, while supporting the cylinder above the reservoir, check the fluid flow through the compression valve.
When properly assembled, there should be a drip of fluid;
- - insert the rod with piston 14 without distortion into the cylinder, install the guide 9 rod into the cylinder and slowly, so that there is no splash of liquid, lower the cylinder into the tank;
- - tighten the nut 4 with a torque of 70—90 Nm (7—9 kgcm) with the rod extended.
Tightening the nut presses the rod guide into the cylinder.
After assembling the shock absorber, move the rod in and out several times until a uniform force appears along the entire length of its stroke.
To check the tightness of the shock absorber, it is recommended after assembly to keep it in a horizontal position with the stem retracted to failure for at least 10 hours.
Shock absorber malfunctions and solutions
- Cause of malfunction
Liquid leakage from shock absorber:
- Reservoir nut loosening
Tighten the nut
- Wear of the stem seal
Replace oil seal
- Nicks or risks on the stem, wear of the stem before the chrome layer comes off
The absence of a chrome layer is checked by the reddening of the stem when it is wetted with a solution of copper sulfate
Unsatisfactory operation of the shock absorber (frequent "breakdowns", vehicle sway):
- Insufficient amount of fluid in the shock absorber
Remove the shock absorber from the car, disassemble, replace the faulty parts and add fluid
Insufficient force during the rebound stroke (when the shock absorber is stretched):
- Piston liner wear
- Nadir on piston or cylinder
Replace damaged parts
- Loose overlap of the bypass valve
Disassemble and wash the shock absorber. If necessary, replace the valve and its parts
Insufficient force (or "dips") in the compression stroke:
- Leaky closing of the compression valve due to the ingress of foreign particles
Rinse shock absorber parts, fill with fresh fluid
Knocks and squeaks during shock absorber operation:
- Loose or worn bushings of the upper and lower shock absorber lugs
Tighten loose nuts. Replace damaged bushings
- Excessive amount of fluid in the shock absorber
Pour fluid into the shock absorber in a strictly defined amount
- Self-loosening of the recoil valve fastening nut
Tighten the nut