04-17-2021, 10:49 PM | #1 |
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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 |
04-18-2021, 11:36 AM | #3 |
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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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09-22-2021, 07:06 PM | #6 |
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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?
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09-22-2021, 10:45 PM | #7 | |
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Quote:
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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