BMW Timing Chain Repair
On a few BMW engines the timing chain guides wear out early. Caught in time it's a planned repair. Ignored, it can destroy the engine.
Which cars are affected
- N20 four-cylinder: 228i, 320i, 328i, 428i, 528i, X1 and X3 28i, Z4 28i (roughly 2012 to 2016)
- N26 (the SULEV version of the N20): 328i
- N63 V8: 550i, 650i, 750i, X5 and X6 50i
- Older N47 and N57 diesels (not sold widely in the US)
Symptoms to watch for
- A whine that rises with engine speed, especially when warm
- Rattle for a few seconds on a cold start
- Check engine light with camshaft or crankshaft timing codes
- Rough running or a lack of power
What fails
The chain itself rarely breaks first. The plastic guides that keep it tight wear and crack, the chain gets slack, and a high-pitched whine starts. Left alone, guide pieces can break off and the chain can jump a tooth or snap, which bends valves. On the N20 and N26 the oil pump drive chain can also be affected.
Why timing matters
A timing job done before failure is a known, quotable repair. A chain that fails on the road usually means a cylinder head rebuild or a replacement engine. If your car has any of the symptoms above, stop driving it hard and have it checked.
How we do it
We confirm the diagnosis with a listen, a scan and timing data in ISTA, BMW's factory software. The repair replaces the chain, guides and tensioner with updated genuine BMW parts, and we use BMW's special timing tools to lock and verify the engine timing. We'll also recommend related items like the valve cover gasket when the engine is already apart, and you decide.
Related
BMW Oil Leak Repair · Engine & Drivetrain Repair · Pre-Purchase Inspection
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Common questions
Does my N20 BMW need a timing chain?
Not automatically. Many have been replaced already, and updated parts are more durable. If you hear a whine or a cold-start rattle, or you don't know the car's history, have it inspected.
Do the B58 or B48 engines have timing chain problems?
Not the widespread guide failures the N20 is known for. We still check timing data on every inspection.
How long does a timing chain job take?
It's a large job. Plan on the car being with us for a few days; we'll give you a timeline with the written estimate.