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2019 Manual Transmission Grinding Sound

I bought a new 2019 370Z with a manual transmission last year, and a few weeks later started noticing a loud grinding sound when changing gears around 5,000RPM. After some

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Old 11-16-2019, 12:04 AM   #1 (permalink)
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Default 2019 Manual Transmission Grinding Sound

I bought a new 2019 370Z with a manual transmission last year, and a few weeks later started noticing a loud grinding sound when changing gears around 5,000RPM. After some troubleshooting, I determined that it doesnít matter if Iím changing gears, leaving it in a gear without touching the shifter, or even leaving it in neutral while revving the engine - the noise continues as long as the engine is above 4,500 with the clutch pedal pushed in. Interestingly, this does not happen after a cold start Ė the car has to be driven for 10-15 minutes before the grinding sound happens.

The symptoms seem to point to a defective throw-out bearing / concentric slave cylinder, which the dealership replaced twice but there was no improvement. They also reproduced the issue in two other new cars on the lot, suggesting that this is a design defect rather than a one-off issue. Nissanís regional Dealership Technical Specialist indicated that a new clutch was designed for the 2018 model year (I previously owned a 2010 that never had this issue in 7+ years of daily driving), and the engineering team heís been in contact with at headquarters has not been able to come up with a fix or even definitively identify the cause.

Has anyone else here experienced this issue? I did my best to capture the sound in the link below, but itís much worse in person. Iím meeting with the Technical Specialist again next week and Iím going to try to get them to cover an aftermarket CSC replacement under the warranty since they canít fix it with OEM parts, but Iím curious if anyone else has any ideas on this.

https://youtu.be/chDMb76_1c8
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Old 11-16-2019, 12:18 AM   #2 (permalink)
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Quote:
Originally Posted by aero-head View Post
I bought a new 2019 370Z with a manual transmission last year, and a few weeks later started noticing a loud grinding sound when changing gears around 5,000RPM. After some troubleshooting, I determined that it doesnít matter if Iím changing gears, leaving it in a gear without touching the shifter, or even leaving it in neutral while revving the engine - the noise continues as long as the engine is above 4,500 with the clutch pedal pushed in. Interestingly, this does not happen after a cold start Ė the car has to be driven for 10-15 minutes before the grinding sound happens.



The symptoms seem to point to a defective throw-out bearing / concentric slave cylinder, which the dealership replaced twice but there was no improvement. They also reproduced the issue in two other new cars on the lot, suggesting that this is a design defect rather than a one-off issue. Nissanís regional Dealership Technical Specialist indicated that a new clutch was designed for the 2018 model year (I previously owned a 2010 that never had this issue in 7+ years of daily driving), and the engineering team heís been in contact with at headquarters has not been able to come up with a fix or even definitively identify the cause.



Has anyone else here experienced this issue? I did my best to capture the sound in the link below, but itís much worse in person. Iím meeting with the Technical Specialist again next week and Iím going to try to get them to cover an aftermarket CSC replacement under the warranty since they canít fix it with OEM parts, but Iím curious if anyone else has any ideas on this.



https://youtu.be/chDMb76_1c8
Please keep us updated on whether Nissan will pony up for a ZSpeed CMAK!

Sent from my SM-G955U using Tapatalk
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Old 11-16-2019, 12:36 AM   #3 (permalink)
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I don't hear a thing. That is not a CSC issue or Throw out bearing. Maybe a pilot bushing. I just don't hear a thing in the video. Our transmissions are naturally noisy.
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Old 11-16-2019, 01:51 AM   #4 (permalink)
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Probably the normal sound made by the pressure plate/clutch/flywheel arrangement of the Z - many others have reported the same "problem." As per Spooler, it could be a pilot bushing but that would be low on my list for a low-mileage Z.
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Old 11-18-2019, 12:53 AM   #5 (permalink)
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Originally Posted by SouthArk370Z View Post
many others have reported the same "problem."
Reported on this forum? I've seen several threads about rattling at idle, clunking during 1st-to-2nd shifts, etc. but haven't been able to find any posts here or elsewhere about grinding at 5,000 RPM. As I said, this wasn't happening at all in my old 2010, so it seems to be a more recent problem related to the new clutch Nissan started using in the past couple years.
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Old 11-18-2019, 10:20 PM   #6 (permalink)
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Originally Posted by Spooler View Post
I don't hear a thing. That is not a CSC issue or Throw out bearing. Maybe a pilot bushing. I just don't hear a thing in the video. Our transmissions are naturally noisy.
You need hearing aids. I don't hear anything either with head phones on.
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Old 11-19-2019, 06:46 AM   #7 (permalink)
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Yes honestly I donít hear anything in this vid.
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Old 11-27-2019, 12:59 AM   #8 (permalink)
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I think Nissan just used a different clutch for the newer model. The transmission and the clutch hydraulic (cmc & csc) haven't changed.

you can always replace it with the older version of the clutch and that noise should be eliminated.

Quote:
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They also reproduced the issue in two other new cars on the lot, suggesting that this is a design defect rather than a one-off issue. Nissanís regional Dealership Technical Specialist indicated that a new clutch was designed for the 2018 model year (I previously owned a 2010 that never had this issue in 7+ years of daily driving), and the engineering team heís been in contact with at headquarters has not been able to come up with a fix or even definitively identify the cause.
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Old 11-27-2019, 06:26 AM   #9 (permalink)
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The MT transmission internals changed a little in 2016+ I believe it was with the 5th/6th synchros. Try replacing the fluid, and report back imo.
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Old 12-06-2019, 12:36 AM   #10 (permalink)
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I think Nissan just used a different clutch for the newer model. The transmission and the clutch hydraulic (cmc & csc) haven't changed.

you can always replace it with the older version of the clutch and that noise should be eliminated.
That's interesting. I was under the impression that the CSC was new as well, but it looks like you're right - the Nissan parts site lists the same master and slave cylinder part numbers for model years 2009-2020. Same goes for the pilot bushing (which they also replaced during both of the repair attempts) and the flywheel (which they replaced the last time). The pressure plate and friction disc are the only parts I can find in that area that have different part numbers starting in 2018.

As far as installing the older OEM clutch, Nissan previously told me it's not compatible with the newer car. No idea why that would be, but I can ask again. Otherwise I'll see if I can get them to pay for an aftermarket clutch rather than just replacing the CSC again...
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Old 12-06-2019, 01:11 AM   #11 (permalink)
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Quote:
Originally Posted by aero-head View Post
That's interesting. I was under the impression that the CSC was new as well, but it looks like you're right - the Nissan parts site lists the same master and slave cylinder part numbers for model years 2009-2020. Same goes for the pilot bushing (which they also replaced during both of the repair attempts) and the flywheel (which they replaced the last time). The pressure plate and friction disc are the only parts I can find in that area that have different part numbers starting in 2018.

As far as installing the older OEM clutch, Nissan previously told me it's not compatible with the newer car. No idea why that would be, but I can ask again. Otherwise I'll see if I can get them to pay for an aftermarket clutch rather than just replacing the CSC again...
What Nissan did was to change vendors and spec'ed a different pressure for the pressure plate and a different friction material for the disc. Everything else is the same.
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