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Bmw n57 diesel engine from an E70 30d timing chain stretch causing the engine to rattle at idle and get worse with revs. The top timing chain can be inspected with just the valve cover removed. The lower chain can be inspected the same way but requires a borescope camera to accurately see the extension of the tensioner piston, but realistically requires the engine to be removed and the timing chain covers removed. The oil pump chain also shouldn't be overlooked, as these can stretch too and be noisy at the back of the sump where it joins the gearbox bellhousing.
#e70problems #bmwspecialist #bmwX5
