BMW X5 E70 N47 Timing Chain Failure
The rear-mounted timing chain on N47-engined E70 X5 18d and 20d requires transfer case and gearbox removal to access. Chain rattle on cold start is the first warning. Cost of replacement: £2,000-3,500 on X5 due to additional drivetrain complexity versus saloon models. Never ignore cold start rattle on N47 X5.
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