Engine noise on start-up lasting only a few seconds
Cause
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elimination
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Wrong engine oil or oil with the wrong viscosity has been used.
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Incorrect oil filter without anti-drainage property.
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Worn, damaged, or incorrectly installed oil filter bypass valve.
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High degree of leakage through the valve lifter.
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Worn, damaged or incorrectly installed crankshaft thrust bearing.
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Noise at the top of the engine regardless of engine speed
Cause
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elimination
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Low oil pressure.
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Insufficient lubrication of valve train components.
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Broken valve spring.
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Worn, damaged valve stem, or carbon deposits on the valve seat or stem.
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Worn or damaged valve guide.
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Worn, damaged or dirty valve tappet.
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Worn or damaged camshaft lobes.
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Worn, damaged, incorrectly installed or loose timing belt and sprocket.
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Worn, damaged or incorrectly installed timing belt tensioner, if equipped with engine.
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Noise at the bottom of the engine regardless of engine speed
Cause
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elimination
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Low oil pressure.
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Detonation or detonation combustion of the fuel mixture.
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Worn, damaged, or improperly installed accessory drive belt - Significant cracks, bumps, or missing segments.
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Worn, damaged, or incorrectly installed accessory drive system components.
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Worn, damaged or incorrectly installed crankshaft pulley.
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Worn, damaged or improperly installed engine flywheel.
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Worn, damaged or incorrectly installed torque converter.
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Damaged oil pan causing it to come into contact with the oil pump strainer - A damaged oil pan may be loose, misaligned, or obstruct the passage of oil through the oil pump strainer, reducing oil flow to the oil pump.
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Worn, damaged, improperly installed, or jammed oil pump strainer - A damaged oil pan may be loose, misaligned, or obstruct oil passage through the oil pump strainer, reducing oil flow to the oil pump.
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Worn, damaged, or incorrectly installed piston - Pistons must be installed in accordance with the marking or indentation on the top surface of the piston that faces the front of the engine. The piston pins must be centered in the connecting rod pin hole.
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Worn, damaged or improperly installed connecting rod bearing.
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Worn, damaged or incorrectly installed main bearing.
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Engine noise under load
Cause
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elimination
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Low oil pressure.
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Detonation or detonation combustion of the fuel mixture.
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Worn, damaged or improperly installed engine flywheel.
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Worn, damaged or incorrectly installed torque converter.
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Worn, damaged, or incorrectly installed pistons - Pistons must be installed in accordance with the marking or indentation on the top surface of the piston that faces the front of the engine. The piston pins must be centered in the connecting rod pin hole.
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Worn, damaged or improperly installed connecting rod bearing.
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Worn, damaged or incorrectly installed main bearing.
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