Hi all!

First post. Let me thank all of you, I have found plenty of insight in these threads in the short time I've had my G37.

I bought my 2012 G37S 6MT from a friend for a steal of a price. The CSC blew shortly after so I had the OEM clutch and flywheel replaced with the Z1 clutch + midweight flywheel and HD JW CSC. After about 2000 miles, I'm getting a low sort of electronic humming when the clutch is to the floor. As I shift and let off the clutch pedal, the sound goes higher pitch until my foot is off the pedal.

Any insights?

 

Any type of noise (whine, hum, shriek), or rumble, when the clutch pedal is pressed down, usually indicates either a pilot bearing or the release bearing wearing out. When you had all of the above parts installed, was the pilot bearing also replaced or, at a absolute minimum, repacked with grease?

Also, some manufacturer's recommend adding a thin layer of grease where the "fingers" of the pressure plate contact the face of the release bearing.

I will let others more familiar with the the parts you installed chime in but with only 2K miles, you should have some type of warranty on the parts. My bet would be on the release bearing going bad.

I just went through all of this on my beater pickup so I know the aggravation having to drop everything all over again.

 

By "release bearing," I think you mean the CSC, as the CSC on these cars have a built in release/throwout bearing. I agree that this sounds like a problem with the CSC.

 

That is exactly what I was saying. Some CSC's have "replaceable" release bearings though most just replace the whole CSC unit because you're already there.

 

I spoke to Z1 and they were helpful, but it's really tough to explain over the phone. The best I could think of was making a sound recording. I haven't done that yet.

I told him my concerns about potential damage to the transmission or crankshaft, and he said it wouldn't be an issue--that the worst that could happen would be damage to the clutch disc. Does this sound right?

I'm wondering if the Heavy Duty CSC by JWT is defective. I went with that over OEM, because of the build quality issues with stock CSC.

Do you happen to have any experience with aftermarket CSCs?

 

Z1 has been helpful? Consider yourself lucky. Here lately, well, different topic..

If the release bearing is the issue, over time it will start to bind and will eventually fail. A failing release bearing will put undue stress on all of the clutch components making for hard, stubborn shifts, noise, and increased wear on the disc and pressure plate. In other words, the quicker it is addressed the better off for your car.

Back in the day I always used Exedy clutch components for my Honda's and Acura's. In fact, I just installed my 2nd Exedy set in my old beater pickup (w/ 255k miles) this past March. I have no experience with JWT so perhaps others more knowledgeable with them and their products will chime in.