What are the solutions for the rattling noise in BMW N20 engine?
2 Answers
BMW N20 engine rattling noise solutions are: 1. Cold start noise caused by unsuitable engine oil; 2. Improper belt tension; 3. Poor fuel quality or incorrect octane rating; 4. External engine factors; 5. Insufficient oil pressure causing timing chain malfunction; 6. Crankcase ventilation leakage. Engine maintenance items include: 1. Regular oil and oil filter replacement; 2. Maintaining good crankcase ventilation; 3. Regular crankcase cleaning; 4. Periodic fuel system cleaning; 5. Regular radiator maintenance; 6. Fuel system maintenance and cleaning. The engine consists of: 1. Valve train; 2. Crankshaft connecting rod mechanism; 3. Ignition system; 4. Cooling system; 5. Lubrication system; 6. Fuel supply system.
I've been driving a BMW for many years. Once, my N20 engine started making a ticking sound, like metal knocking, especially noticeable during cold starts. After researching, I found it could be an issue with the timing chain—either the chain is loose or the tensioner is failing, causing parts to rub and create noise. I recommend going directly to a 4S shop or a professional auto repair shop to check the timing chain components. Replacing the tensioner and chain should fix it. Don’t try to DIY, because if left unfixed, a broken chain could lead to costly engine repairs. Also, pay attention to regular oil changes—using high-quality oil can reduce wear. Actually, many N20 engines have this common issue, so as soon as you hear the noise, get it checked to avoid bigger problems that could affect driving safety. Oh, and during routine maintenance, regularly inspect the timing system to prevent noise and ensure smooth operation.
