Had a new engine from ford Germany fitted in my car after a piston was destroyed. Expected to have to contact dvlc to regestered new engine number but apparently the new engine came with a blank plate and they punched the old engine number on it

That is the way Ford do it. I bought a brand new crate Zetec and that came with a blank area for the number of the old engine to be stamped on.

Not sure about other makes but the VIN on a Ford includes the engine number. Fitting an engine with a different number would make a mockery of the VIN thus the necessity to retain the old one.

Obviously if you fit an engine from a scrapper the Ford rules don't apply.

i had my hyundai i20 engine replaced a few months back, it has a different engine number plate, and sent updated docs to dvla too

it was a sub engine that was changed, not sure what that is exactly, but big enough for engine no. change.

Was it a manufacturer supplied brand new engine from the factory? Surprised one of these failed, it's the first one I've heard of. What went wrong?

i explained it below in a previous thread

www.honestjohn.co.uk/user-article/117381/hyundai-i...3