Does the B47 / B57 diesel have a timing belt or a chain?
The B47 / B57 diesel used by BMW (2014 onwards) runs a timing chain. Chain-driven with no scheduled change, though early B47 chains were revised. Listen at the bulkhead on a cold start.
Timing chain
B47 / B57 diesel timing chain guide
BMW · 2014 onwards. Chain-driven with no scheduled change, though early B47 chains were revised. Listen at the bulkhead on a cold start.
- Drive type
- Timing chain
- Published interval
- No scheduled change
- Typical job cost
- £1,200-£2,600
- Buying risk
- Low · no scheduled change, wear tracks oil quality
Fitted to
Commonly 1, 2, 3, 4, 5 Series, X1-X5 (2014 onwards). Engine codes changed through production, so confirm the code on the car in front of you before ordering parts or quoting the job.
Warning signs on the drive
- Rattle for one to three seconds on cold start, then it quietens.
- Chain or tensioner noise that rises with load rather than revs.
- Timing-correlation fault codes (P0016, P0017) on a scan.
- Long cranking before the engine catches.
- Metal glitter in the oil or on the filter at service time.
What to check before you buy
- Cold start it yourself and listen for a rattle before the oil pressure builds.
- Scan for timing-correlation codes even if no light is on.
- Check oil-service intervals · chain wear follows neglected oil more than mileage.
- Look for a chain kit already fitted on high-mileage examples, which is a positive.
- Spend the rest of the inspection budget on the faults this family is actually known for.
Questions dealers ask
What is the B47 / B57 diesel timing belt interval?
There is no scheduled replacement interval for a chain. Judge it on cold-start noise, fault codes and oil-service history instead.
How much does the job cost on a B47 / B57 diesel?
Expect roughly £1,200-£2,600 at a UK independent garage, depending on whether the water pump and tensioner go in at the same time and how much has to come off to reach the belt. Main-dealer quotes usually sit above that range.
What happens if the timing drive fails?
On an interference engine the valves and pistons meet, which usually means a cylinder head at best and a replacement engine at worst. That is why an unproven timing history is a price conversation, not a detail.
Which models used the B47 / B57 diesel?
Commonly 1, 2, 3, 4, 5 Series, X1-X5 (2014 onwards). The list is not exhaustive and engine codes changed through production, so confirm the exact code on the car in front of you before ordering parts or quoting work.
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