Ok here this is that N20 with the engine rattle,,,BMW wanted me to check out the engine to find the problem,,,,so they had me remove the valve cover and check the upper end for any abnormal wear or damage,,,,,then the wanted me to check the rod bearings,,,,,here a pic of the oil pan and oil pump removed,,,,also the rod bearing caps are removed. Here is a picture of all 4 rod bearing caps,,,,as you can see they are all worn the same,,,,but are biggest worry is how they are worn at the very bottom middle. Here is a close up of one of the rod bearing,,,,you can see how they are worn,,,,,it’s hard to tell from the picture,,,,but there is almost a copper color to this bearing,,,,,that is bad news,,,,,when you start to see a copper color in a bearing,,,,that is a sign of a worn bearing,,,,,BMW wants me to replace the whole engine,,,,,the bad news it doesn’t pay for a tech,,,,it only pays 16 hours to remove engine and swap over all the parts to the new engine,,,,,that 2 days of work to before a engine swap.
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