Warning! Malfunctions in the suspension of the car can lead to a serious accident!
Carry out a suspension check according to the method described in Sec. Chassis.
Tab. 1. Possible causes of knocks in the suspension and how to eliminate them
Cause | Remedy |
Defective shock absorbers | Replace or repair shock absorbers |
Bolts and nuts of fastening of a bar of the stabilizer of cross-section stability are weakened; pillows and rubber-metal hinges of the rod are worn out, the anti-roll bars are damaged | Tighten the rod mounting bolts; if the rubber pads are worn out, replace them, replace the damaged parts of the stabilizer |
Damage, deformation of rubber-metal hinges of levers, upper supports of shock absorber struts | Replace hinges, upper strut mounts |
Wear of the ball bearings of the front suspension arms | Replace ball joints |
Increased clearance in wheel bearings | Replace hubs |
Large wheel imbalance | Balance the wheels |
Wheel disc deformation | Replace disc |
Suspension spring settling or failure | Replace spring |
Wear of rubber-metal hinges (silent blocks) suspension arms | Replace rubber mounts (silent blocks) |
Knock off «breakdown» suspension due to destruction of compression buffers | Replace damaged buffers |
Frequent «breakdowns» rear suspension due to rear axle overload | Don't Overload |
Note. It is better to check the condition of the suspension on a car mounted on a flyover, inspection ditch or lift, and if this is not possible, you can do this work on a free flat area, albeit with less convenience. In any case, you will need an assistant.
It is rather difficult to diagnose the health of transmission units by the noise they emit. If you are unable to pinpoint the source of the noise, contact a qualified technician.
Tab. 2. Possible knocks (noises) transmissions, their causes and solutions
Cause | Remedy |
Noise when disengaged | |
Clutch release bearing wear or lack of lubrication* | Replace clutch release bearing |
Noise when engaging the clutch | |
Deformation or failure of parts of the driven disk | Replace driven disk |
Noise in gearbox | |
Insufficient oil level | Check oil level, top up if necessary |
Wear, destruction of bearings or gears | Replace damaged parts |
Noise when shifting gears | |
Incomplete clutch disengagement* | Air in the clutch release hydraulic drive or its serviceability of the drive units. Bleed the hydraulic drive, replace damaged parts |
Synchronizer wear* | Replace worn parts |
Wear or destruction of bearings or gears | Replace damaged parts |
Knocking at the beginning of the movement of the car | |
Wear of constant velocity joints | Replace faulty hinges |
Increased clearance in the gearing of the final drive gears | Adjust gap |
Wear of the hole for the axis of the satellites in the differential box | Replace differential box |
Knocking, clicking when the car is moving in a turn | |
Wear of the outer constant velocity joint | Replace defective hinge |
* For vehicles with manual transmission.
Repair or replace damaged transmission components (see sect. Transmission).
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