The basic malfunctions of hydraulic jacks of backlashes of valves, causes and solutions are listed in the table.
Malfunction | Possible causes | Remedy |
| ??? Temporary noise when starting from cold | Normal | The noise disappears after warming up the engine oil and achieve a normal pressure |
| ??? Continuous noise after the engine was not started within 48 hours | Oil leaked from the chambers of hydraulic jacks of backlashes of valves, and they hit the air | The noise will disappear after 15 minutes of engine operation when the crankshaft reaches a speed of 2000-3000 min -1  |
Do not increase the engine speed of the engine above 3000 min -1, as this may damage the hydraulic jacks of backlashes of valves.
|
|
| ??? Continuous noise after starting the engine and replace the cylinder head | Insufficient oil in the engine oil ducts |
| ??? Continuous noise after a long start-up starter motor or towed | Oil leaked from the chambers of hydraulic jacks of backlashes of valves, and they hit the air |
| ??? Continuous noise after replacing the hydraulic jacks of backlashes of valves |
| ??? Continuous noise at the frequency of idling after driving at high speed | The engine oil level is too low or too high | Check the engine oil level |
| A large amount of air dissolved in the oil after high speed | Check the oil supply |
| Deterioration of motor oil | Check the oil and, if necessary, replace it |
| ??? The noise lasts longer than 15 minutes | The low pressure in the lubrication system | Check the oil and, if necessary, replace it |
| Defective hydraulic jacks of backlashes of valves | Remove the cylinder head and pressing the hydraulic jacks of backlashes of valves, check the value of compression |
