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      04-17-2021, 10:49 PM   #1
Ssilver356
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Knocking noise N55 640i

Hello everybody

I have a knocking noise on my 640i F06 2013 when engine is warm and at idle only in Park or Neutral. Car and shifting runs fine.

If I move to Drive or Reverse the noise goes away.

I have seen many videos on youtube and i don't found the issue in comments.
Sometimes torque converter, rod knock, exhaust bolt, normal..

I have already removed the belt to eliminate noise of front accessories. Noise seems coming from rear of engine or between transmission and engine.

Some links, it is always N55 + ZF 8hp45 combination :















I would like to know your opinions before removal of my transmission which is pain job.
Thanks for help
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      04-18-2021, 02:26 AM   #2
DaveS86
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If it was Rod knock you would still hear it no matter whether in park, neutral reverse or drive. Sorry I don't have any other answer.
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      04-18-2021, 11:36 AM   #3
Ssilver356
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Yes i don't think it is a rod knock, i will check compressions this week to be sure.

Probably transmission like torque converter but why only with warm engine ? Mystery..
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      04-24-2021, 11:29 AM   #4
Ssilver356
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Here is a video of mine :



When i pull some gas and release, we can ear the noise quicker than the speed of motor

And when I select second gear the noise goes away

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