Hi all,

I own a Rx8 2007 Model. I am having this little problem but i don't know if its a problem or normal case.

When my car is in neutral and i depress the clutch and put it to first, second or third gear, i hear a thump noise in the backside. it is felt on the whole car and like a transfer of energy from front to back. If i depress the clutch for few seconds and then put to to different gears then there is no thump sound.

My mechanic here told me that this is due to faulty clutch kit, so i installed new clutch, flywheel and clutch bearing. The clutch got a loft softer but the sound is still there.

Also i checked the rear axles and they are in perfect condition.

i raised the car from behind and jacked the car up. I was on the driver seat and my mechanic was under the car to monitor the noise. According to him, when i depress the clutch and then put it in first gear a little quick ( while clutch is still depressed fully), the shaft moves on its own a little and made that THUMP sound. He also told me that the noise is generated through the transmission and felt in the back area.


So guys, After all this and changing diff and tranny oil, the noise is still there but i depress for 3 seconds the noise is gone. According to my mechanic, the Shaft totally stops if clutch is depressed a little longer so no noise is generated, but if i speed shift from neutral, the shaft moved itself a little thus creating that thump noise.

Is this normal or something else is going on? Really need help, because if this is normal then will take a load of me. Is the shaft moving itself from transmission while clutch is depressed is OK?

Info: I have no grinding sound issue or Clutch throwout bearing noise

 

Did you bleed the clutch cylinders?

 

How to bleed the clutch cylinders? kindly share the method

 

https://www.rx8club.com/series-i-do-...eeding-198527/

Theres quite a few threads on this out there. Try that and report back.

 

Did the bleed, same problem remains

 

Ya know, come to think of it, I had a FB and a FC that did the same thing and didn't think anything of it since they were older cars (much like these 8's are today) Something to consider is that when the clutch pedal is out, the input shaft in the transmission is spinning. It will take a second or two for it to slow to a stop when you disengage the clutch. If your wheels are off the ground, clutch engaged, and in neutral, the tires will rotate a little (I've observed this before). It's kind of like having your outboard motor in neutral, the prop will slowly rotate unless you physically stop it, or stop the engine. I doubt it's anything to worry about. If it makes a perpetual noise, that is something that may need to be looked at.
Somebody please correct me if I'm wrong.
Justin

 

Thanks for the info, i believe that is normal unless someone else comment on it