Cheap BMW 4 Series Timing Chain

The BMW 4 Series F32 generation ran from 2013 to 2020, with a facelift introduced in 2017, and the timing chain is fitted across petrol and diesel variants throughout that generation. Because the chain itself follows the engine code rather than the facelift date, a chain from a pre-2017 car with the same engine code will generally match a post-2017 car with the same engine code. However, ancillary components around the chain assembly can change mid-production, so confirm the full engine code from your V5 or a VIN check with the breaker before buying.

Because the timing chain is driven entirely by the engine, not the bodyshell, a chain from a 4 Series F32 with a given engine code — say N20, N47, or B47 — is the same unit as one fitted to a 3 Series F30 sharing that exact engine code. The 4 Series and 3 Series share most of their powertrain architecture, so the badge on the car is irrelevant here. Always confirm the full engine code matches between donor and recipient vehicle with the breaker to be certain.

All BMW 4 Series diesel engines, including the N47, N57, and their B47 and B57 replacements, use a timing chain rather than a belt, so there is no scheduled belt replacement interval. The same applies to the petrol engines fitted to the 4 Series, such as the N20, N55, and later B46 and B58 units. If you are searching for a replacement, the engine code is the critical detail — supply it to the breaker so they can match the correct chain kit to your specific engine variant.

Trim level has no effect on timing chain fitment — M Sport, Sport, SE, and Luxury are all cosmetic and equipment packages that do not alter the engine internals. What determines the correct chain is the engine code, which will be identical on two cars of the same engine variant regardless of whether one is an SE and the other an M Sport. Focus on supplying your engine code to the breaker rather than your trim designation.

The G22 4 Series, which launched in 2020 as the second generation, does use timing chains across its petrol and diesel engine range, including the B46, B48, B57, and S58 units. However, the G22 uses an entirely different engine family from the F32 in most cases, and the chain assemblies are not interchangeable between generations even where fuel type appears the same. Always check the engine code on your V5 or via a VIN check and confirm compatibility with the breaker, as donor and recipient codes must match exactly.

The 420d and 430d use different diesel engines — the 420d typically uses a four-cylinder unit such as the N47 or B47, while the 430d uses a straight-six such as the N57 or B57 — and these engines have different timing chain assemblies that are not interchangeable. The displacement and power output in the badge reflect genuinely different engine architectures in this case, so you cannot assume the chains are shared. Always identify your exact engine code from the V5 or a VIN check and supply that to the breaker rather than relying on the model badge alone.