The main malfunctions of hydraulic valve clearance compensators, causes and methods of elimination are given in the table.
Malfunction | Possible reasons | Elimination Method |
Intermittent noise when starting a cold engine. | Normal phenomenon | The noise disappears after the engine oil warms up and normal pressure is reached |
Continuous noise after the engine has not been started for 48 hours. | Oil has leaked from the chambers of the hydraulic valve clearance compensators and air has entered 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 the engine speed above 3000 rpm-1, as the hydraulic valve clearance compensators may be damaged. |
Continuous noise after starting the engine and replacing the cylinder head | Not enough oil in engine oil passages | |
Continuous noise after a long start of the engine with a starter or towing method | Oil has leaked from the chambers of the hydraulic valve clearance compensators and air has entered them | |
Continuous noise after replacing hydraulic valve clearance compensators | ||
Continuous noise at idle after driving at high speed | Engine oil level too low or too high | Check engine oil level |
A large amount of air is dissolved in the oil after high speed | Check the oil supply system | |
Deterioration of engine oil properties | Check the quality of the oil and change it if necessary | |
Noise continues for more than 15 minutes | Low pressure in the lubrication system | Check the pressure in the lubrication system |
Faulty hydraulic valve clearance compensators | Remove the cylinder head and, by pressing on the hydraulic valve clearance compensators, check the amount of compression |