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BMW diesel turbos: what to check before you reuse one

Diesel turbo checks at our Hamburg yard

How to decide whether the turbo on a used BMW diesel can go back on, and what the photos should show.

  • BMW diesel turbo
  • reuse turbo on replacement engine
  • turbo shaft play
  • N57 turbo check

Also searched as bmw turbo oil, vnt turbo check, should I replace turbo.

Whose turbo is it

Diesel turbo checks real photo 1

If the replacement engine is photographed with a turbo, that is the turbo you receive. If your plan is to move the old turbo across, inspect that one before it goes onto a fresh engine. A tired turbo will fill the new intake with oil.

Bavarian Engines Store will say if the unit in the photo is a single, twin or triple layout. Count them.

Checks without a flow bench

Diesel turbo checks real photo 2

Feel for shaft play. A little radial movement can be normal. In-and-out movement is not. Look for oil in the inlet and the intercooler pipes, for a damaged compressor wheel and for a stuck variable-vane mechanism on diesels that have one.

Wastegate rattle on a petrol is a different noise. On a diesel, a howl that rises with revs, or blue smoke under load, is the reason to stop and look.

Why they fail

Oil starvation, long oil-change intervals, a blocked feed or a hot shutdown are the usual causes. Putting the old turbo on a new engine without cleaning the oil feed repeats the failure.

If the old engine failed because of metal in the oil, do not reuse that turbo.

Pipes and the cooler

Clean or replace the intercooler pipes if they are wet with oil. Fit a new oil-feed line if the workshop recommends it for that code. A crushed return pipe will push oil into the intake.

The actuator and its vacuum pipes are part of the check. A new engine cannot fix a split vacuum hose.

Ordering

Say whether you need the turbo on the engine or a separate one. Read the photos. Ask for a closer shot of the compressor if you are unsure.

The engine warranty does not cover a turbo you supplied.

Warranty

Many engines come with up to 12 months warranty. A proper workshop must fit the engine. The warranty is for a fault inside the engine. It does not cover the wrong engine, a dry start, the wrong oil, or damage done after you open the crate.

Shipping

Crate shipping from Hamburg costs 299 EUR. We pack the engine in a strong crate and send it to the address on your order. You need a forklift or an engine crane to unload it.

FAQ

Is the turbo included?

When it is in the photographs, yes.

Can I move my old turbo across?

Only after you check shaft play and oil in the intake. Do not reuse one from an engine that made metal.

What is normal shaft play?

A small radial movement can be normal. Movement in and out is not. If you are unsure, do not fit it.

Do you ship diesel turbo checks to my door?

Yes. Crate shipping from Hamburg costs 299 EUR to the address on your order.

How long is the warranty?

Up to 12 months on many engines, for a fault inside the engine, after a proper fit. See the warranty page for the full rules.

Are the photos of the real engine?

Yes. When you buy Bavarian Engines Store engines from us, the photos are real photos from our yard, not made-up pictures.

Can you check my VIN first?

Yes. The VIN check is free. Send it before you pay and we confirm the engine fits.

Browse the shopFree VIN check

Further reading