Valve tappet failures (Hyundai Getz 1)

Sign of malfunction	Cause of malfunction	Method of elimination
Knocking noise when starting a cold engine that then stops	Normal phenomenon	The knocking stops once the oil pressure reaches normal values
Knocking for a long time when starting an engine that has not been running for 48 hours or more	Oil leakage from the high pressure chamber of the tappets and air getting into it	The knocking should stop within 15 minutes when the engine is running at 2000-3000 min⁻¹
Constant knocking noise when first starting the engine after assembling the cylinder head	Insufficient oil supply to the cylinder head oil line	Ensure normal oil supply to the cylinder head oil line
Constant knocking during engine operation after prolonged cranking by the starter or by the wheel	Oil leakage from the high pressure chamber of the tappets and air getting into it	Ensure normal oil supply
Constant knocking noise when engine is running after replacing tappets	Insufficient oil supply to the tappets	Ensure normal oil supply
Constant knocking noise at idle after engine operation at high crankshaft speed	Engine oil level is above or below normal Large amounts of air entering the oil when the engine is running at high crankshaft speed Deterioration of oil quality	Check the oil level and restore it to normal if necessary Check the lubrication system Check the quality of the oil
Knocking when the engine is running for 15 minutes or more	Low oil pressure Pushrod failure	Check the oil pressure and supply to all engine components Remove the cylinder head cover and check if the tappet plungers move when pressed with a finger. If the plunger moves, replace the tappet