BMW 5 Series: N57 Six-Cylinder Diesel Rear Timing Chain Catastrophic Failure

The N57 3.0-litre inline-six diesel shares the N47's fundamental layout flaw: the timing chain sits at the rear of the engine behind the flywheel. The N57 chain and plastic guide rails degrade silently; failure results in a sudden chain snap with no prior audible warning, stopping the engine and typically bending valves. Replacement requires gearbox removal on a rear-wheel-drive platform and represents one of the most labour-intensive engine repairs available. BMW issued limited goodwill support in some markets. Multiple documented NZ and AU F10 failures are on record.

• Sudden engine stop at speed with no warning
• Faint rear-engine rattle only audible at idle in a quiet environment
• Engine refuses to restart after sudden stall
• Oil pressure light during or immediately before failure event

1. 1

   Verify complete service history and mileage authenticity.

2. 2

   Listen at idle with windows down and radio off for any rear-engine chain rattle.

3. 3

   Pre-purchase inspection by a BMW diesel specialist is essential for any N57 above 150,000 km.

4. 4

   Ask specifically whether chain tensioner status has ever been assessed.

5. 5

   Avoid purchasing N57 vehicles with incomplete service records above 120,000 km without independent specialist sign-off.

Parts involved: Timing chain.

$5,000 to $11,000 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

• “Has the rear timing chain or chain guide been replaced?”
• “Has any gearbox or transmission work been done that would have revealed chain condition?”
• “Any sudden stall events recorded in the vehicle history?”
• “Complete service history available with dealer or specialist stamps?”

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.