Used BMW 320d engine: how to buy the right unit

To buy the right used BMW 320d engine, match the engine code to your exact car, check the mileage and why the donor was broken, and buy with a clear return policy behind you. An engine is the highest-value used part most people will ever buy, so the checks matter, but a sound used unit saves you thousands against a new or reconditioned engine.

Why is the engine code the first thing to match?

Because "320d" covers several different engines over the years. The earlier cars used the M47, then the N47 from around 2007, and the B47 from around 2015. They differ in mounting, electronics and ancillaries, and they are not interchangeable. The engine code is stamped on the block, and your registration confirms which unit your car needs. Match the code first, and everything else follows. Get it wrong and nothing else matters.

What mileage and history should I ask for?

Ask the donor car's mileage and why it was broken. An engine from a car scrapped after an accident or for an electrical fault is a very different prospect from one pulled because the engine itself failed. A good breaker knows the donor's story and shares it. Lower mileage and a clean reason for removal are what you want, and on the N47 in particular it is worth asking about the timing chain, which is a known weak point on that engine.

What can be checked on a removed engine?

The breaker should be able to confirm the engine turned over freely, that there is good compression where it could be tested, and that the unit was not the reason the car was scrapped. Look for a clean block with no major oil or coolant contamination, and ask whether it came complete or as a bare unit. An honest seller tells you what was checked and what was not.

Does it come complete, and what else will I need?

Clarify exactly what is included: the turbo, injectors, manifolds and ancillaries, or whether it is a part-stripped unit. Knowing this up front avoids surprises during fitting. It is also wise to budget for new seals, a timing chain service on the N47, and fresh oil and filters when the engine goes in, since doing that work while the engine is out is far cheaper than later.

What protects me on a part this size?

A return policy. At Partsworth every order is covered by our 30 day returns policy, so if the engine does not match or does not perform as described, you are covered. On a purchase this significant, that safety net is what lets you buy used with confidence.

Where to start

Browse our BMW parts or the engines and transmission collection. Every unit is inspected, ships with free tracked UK delivery, and is backed by 30 day returns. Send us your registration and we will match the correct 320d engine to your car before you buy. Parts worth your trust.