BMW's four-cylinder diesel is a strong performer, but its rear-mounted timing chain is one of the most significant known faults in the entire BMW range.
The N47 is a 2.0-litre diesel four-cylinder used extensively across BMW's diesel line-up during the late 2000s and 2010s.
The N47's timing chain sits at the rear of the engine against the bulkhead, and is prone to premature wear — requiring engine removal to replace.
Swirl flaps in the intake manifold can break and enter the cylinder, risking serious internal engine damage.
Carbon build-up on the EGR valve is common and can trigger rough running and fault codes.
Worn glow plugs cause hard cold starts, particularly in cooler months.
Have the timing chain inspected proactively on higher-mileage N47s — this is the one issue where waiting for symptoms can be very costly.
Full BMW-specific diagnostic scan to identify the exact source of the issue rather than guessing.
Checking known leak points, wear items and service history against the N47's specific weak spots.
Confirming any rattle, misfire, or rough-running symptoms under real driving conditions.
Timing chain failure is the N47's defining issue — because the chain is rear-mounted, replacement requires engine removal, making early diagnosis critical.
The N47 was used in 1 Series (E87/F20), 3 Series (E90/F30), X1 (E84) and 5 Series (F10).
A powerful and efficient diesel, but the rear timing chain is a genuine reliability risk that makes proactive inspection essential, especially past 100,000km.
Book a diagnostic with our BMW-trained technicians in Merrimu — serving Melton, Bacchus Marsh, and Melbourne's western suburbs.