Strange knocknock in my N53B30

[dorottya]

Hello everybody,

can you please check my engine sound? If you listen carefully you can hear some kind of dull knocking apart from the "normal" diesel-ish sound.

https://youtube.com/shorts/yBzhUauLrs4

This is my N53B30 204hp, year 2010. Sometimes when coming to idle 600 rpm there is some kind of dull knocking sound. The knocking gets faster with revs, but gone when revs get to 900rpm.

Oil is quite new, BMW LongLife-4, level is okay, tempreature is normal operating hot temperature. The car runs fine.

Any idea? Is this normal? Is my conrod about to come out?

Thanks

[dropcula]

Hey man,

I bought my N53B30 330i 2009 2 months ago with 210k km on it. I have this strange knocking sound as well from time to time, sometimes cold sometimes hot. It sounds like coming from the bottom, I hope it's nothing too expensive like a rod bearing thing.

Did you have it checked out? Was it solved? Thanks!

[dropcula]

Here's a little video. But I checked on another post and people say its from HPFP(high pressure fuel pump) and many say they have the same sound: https://bimmerpost.com/forums/showthread.php?t=1917730