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      03-30-2021, 03:45 PM   #2
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Drives: 2017 440i Gran Coupe & 2015 X5
Join Date: Nov 2012
Location: Orange County, CA

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From https://www.carcomplaints.com/news/2...g-chains.shtml

"The lawsuit alleges the plastic guide for the timing chain is made with a defective polycarbonate composition that causes the guide to break apart and lodge in the crankshaft drive sprocket, causing the chain to damage the engine.

As for the secondary chain, the lawsuit says it connects the oil pump and balance shaft assemblies to the crankshaft, but due to allegedly defective materials, the chain elongates and damages the sprocket."

The sad truth: this problem could be entirely avoided if engineers were allowed to return to the fundamentals taught in whatever engineering school they graduated from.
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