The main faults of hydraulic valve clearance compensators, their causes and methods of elimination are given in the table.
Malfunction | Possible reasons | Method of elimination |
| Temporary noise when starting a cold engine. | Normal phenomenon | The noise disappears after the engine oil warms up and reaches normal pressure |
| Continuous noise after engine has not been started for 48 hours. | Oil leaked from the chambers of the hydraulic valve clearance compensators and air got into them | The noise will disappear after 15 minutes of engine operation, when the engine crankshaft reaches a speed of 2000–3000 min⁻¹ Warning! Do not increase engine speed above 3000 min⁻¹, as this may damage the hydraulic valve clearance compensators. |
| Continuous noise after engine start and cylinder head replacement | Not enough oil in the engine oil passages | |
| Continuous noise after prolonged engine starting by starter or towing method | Oil leaked from the chambers of the hydraulic valve clearance compensators and air got into them | |
| Continuous noise after replacing hydraulic valve clearance compensators | ||
| Continuous noise, at idle speed after driving at high speed | Engine oil level is too low or too high | Check the engine oil level |
| A large amount of air is dissolved in the oil after high speed rotation | Check the oil supply system | |
| Deterioration of motor oil properties | Check the quality of the oil and replace it if necessary | |
| The noise continues for more than 15 minutes | Low pressure in the lubrication system | Check the pressure in the lubrication system |
| Hydraulic valve clearance compensators are faulty | Remove the cylinder head and, by pressing on the hydraulic valve clearance compensators, check the amount of their compression |