Chaîne de distributionBMW
BMW N47 Timing Chain
Rear-mounted N47 timing-chain wear is a major buyer risk because noise, service history, and repair access decide whether the car is affordable or a trap.
Repair difficulty
Haut
Estimated cost
High, because engine access and labor dominate the job.
Affected models and engines
- BMW 1 Series, 3 Series, 5 Series, X1, X3 diesel models using N47 variants
Symptoms
- Hochet de démarrage à froid
- Metallic chain noise at idle
- Timing correlation faults
- Hard starting or rough running
Why it fails
- Long oil intervals accelerate chain and guide wear.
- Rear engine placement makes repair labor intensive.
- Ignored early noise can become catastrophic timing failure.
Checks before buying
- Listen from cold near the rear of the engine.
- Reject cars with vague oil-service history.
- Ask for chain repair invoices if mileage is high.
- Scan for timing and cam/crank correlation faults.
Fault codes to investigate
Fault codes guide diagnosis; they do not confirm a part without live data, inspection, service history, and repeat testing.
Related research
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Aide à l'acheteur
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Points faibles connus du moteur et de la boîte de vitesses.
Codes d'erreur et symptômes à vérifier.
Questions d'inspection avant négociation.
Il s’agit d’un guide pour l’acheteur, et non d’une inspection mécanique à distance ou d’une garantie. Vérifiez toujours la voiture en personne avec les diagnostics et les dossiers d'entretien.