BMW E60 5 Series N47 Timing Chain Rattle — 520d 525d
The N47 diesel engine in E60 520d and 525d develops rear timing chain rattle from cold start. The chain is rear-mounted requiring gearbox removal for replacement — making this the most expensive common timing chain job in the mainstream market. Cost: £1,500-3,200. Always replace chain, guides, tensioner and clutch/DMF simultaneously.
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