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      04-17-2021, 11:49 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, 03:26 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, 12:36 PM   #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, 12:29 PM   #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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      09-22-2021, 12:03 PM   #5
Ssilver356
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Ok guys I have changed my torque converter and the problem is solved



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      09-22-2021, 08:06 PM   #6
Alpine650
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I have a similar issue in my 2017 650 that the BMW engineers say is the Torque Converter but, "it is within tolderance". Of course, the vehicle was under full manufacturer Warranty. How mucy does a Torque Converter cost and how many hours labor to replace?
Thanks
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      09-22-2021, 11:45 PM   #7
Ssilver356
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Quote:
Originally Posted by Alpine650 View Post
I have a similar issue in my 2017 650 that the BMW engineers say is the Torque Converter but, "it is within tolderance". Of course, the vehicle was under full manufacturer Warranty. How mucy does a Torque Converter cost and how many hours labor to replace?
Thanks
I have done it myself one day to remove, an other day to reinstall.
The part was 2400$ at the dealer, i bought it directly at ZF for 800$. After there is the oil pan, the oil, and several seals & screws.

I have never seen this issue on 650, I though it was only with 8ph45 gearbox + N55 conjunction..
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      09-23-2021, 05:49 PM   #8
Alpine650
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My problem isn't a knocking noise but rather a vibration from 1500-2000 RPMs.
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