A 2–5 second rattle on a cold-started BMW N47 is the classic timing chain warning — and it's not a rattle you can ignore. The N47 uses a chain mounted at the back of the engine that snaps catastrophically with little warning. Address it within weeks, not months.
Bob's Mechanical Repairs — independent family-run garage in Birnam, Dunkeld, Perthshire. Call 01350 727 276 or email [email protected].