does anyone have a chatter in the clutch on light accell from a stop or in reverse??

 

I did for the first 1000 miles or so. All is well now at 6500 miles.

 

Mine has 1400 mi. on it, and I have had clutch chatter since day one. More noticeable in reverse, but annoying either way.

 

Yes we did, and had the clutch replaced under warenty. There is a service bullitin out on it. Any one have the bullitin # handy? My GM link is down today.

 

Some have inquired:
Clutch Pedal Does Not Return to Up Position During Shifts at High Engine RPMs (Inspect Date Code and Replace Clutch Kit) #05-07-31-001 - (Apr 8, 2005)
Clutch Pedal Does Not Return to Up Position During Shifts at High Engine RPMs (Inspect Date Code and Replace Clutch Kit)
2005 Cadillac CTS-V

2005 Chevrolet Corvette, SSR

with Tremec T56 6-Speed Manual Transmission (RPOs M10, M12, MM6)

Condition
Some customers may comment that while shifting at engine speeds greater then 6000 RPMs, the clutch pedal does not return to the up position. As the engine speed decreases, the clutch pedal will return to the up position.

Cause
It is possible that when the engine speed is greater than 6000 RPM and the clutch pedal is depressed, centrifugal loads on the clutch diaphragm spring may be greater than the clutch return load from the diaphragm spring. This force created by RPM would be directionally opposite to the clutch bearing force, causing a near net zero or less than zero return force. As a consequence, the clutch pedal may be stuck at the bottom of travel at the floor. Once the engine speed reduces to less than 6000 RPM, spring return load dominates and the clutch pedal returns to normal function.

Correction
Inspect the clutch date code and replace the clutch kit if built PRIOR to the following date code:

• 4M21A/B/C for CTS-V and SSR

• 4M13A/B/C for Corvette





Remove the transmission to inspect the date code on the clutch pressure plate (4). Refer to the applicable procedure below:
- Corvette -- Clutch Assembly Replacement (SI Document ID #1399532)

- CTS-V -- Clutch Assembly Replacement (CTS-V) (Document ID #1453054)

- SSR -- Clutch Assembly Replacement (SI Document ID #1581481)





Important:
The suspect clutches were built PRIOR to the following date codes:



• 4M21A/B/C for CTS-V and SSR

• 4M13A/B/C for Corvette


The date code is located on the pressure plate cover as shown above.
Replace the clutch kit (see part list below) if the date code on the pressure plate is PRIOR to the following date code:
- 4M21A/B/C for CTS-V and SSR

- 4M13A/B/C for Corvette


The date codes are interpreted as follows:


- The first character is the year.

• 4 = 2004

• 5 = 2005

- The second character is the build month.
Important: The letter J is not used in the month code.



• January = A

• February = B

• March = C

• April = D

• May = E

• June = F

• July = G

• August = H

• September = I

• October = K

• November = L

• December =M

- The third character is the day of the month.

- Important: It is possible that the fourth digit, the shift code, may not be present on the date code. The shift code does not pay a critical part in determining a suspect clutch kit.


The fourth, and final, character is the shift code = A/B/C.

Parts Information
Part Number
Description
Qty

12581713
Plate Asm, CLU Press & DRVN (W/CVR)

(CTS-V and SSR)
1

24233084
Plate Asm, CLU Press & DRVN (W/CVR)

(Corvette)
1


Parts are currently available from GMSPO.

Warranty Information
For vehicles repaired under warranty, use:

Labor Operation
Description
Labor Time

K0800
Disc And/Or Clutch Cover, Clutch - Replace

(CTS-V)
2.4 hrs

Disc And/Or Clutch Cover, Clutch - Replace

(Corvette)
4.5 hrs

Disc And/Or Clutch Cover, Clutch - Replace

(SSR)
2.9 hrs

 

I suspect it Doesn't include mine since my car was manufactured Aug 20, but it is worth a try with the dealer I guess. I have to take it in next week for lifters that collapse overnight, I guess I'll mention this little problem to them while I'm at it.

 

That's interesting that you mentioned the lifters bleed down overnight.
Mine does that but it takes them about a week of sitting idle. They pump up within seconds so I'm not too worried but my car only has 1k miles on it so I hope the prob doesn't get any worse or I may have to take it in for repairs?

 

I am very interested in this thread. I have posted a few comments about this problem with my '06 Z51 - manufactured 23 Sept. It has 2200 miles on it.

Please get back to me if this also describes your noise!

-- Most pronounced under very light acceleration, as in just getting the car rolling and shift. When the clutch pedal is depressed to coast - or shift (especially if the clutch is depressed quickly, as in backing into a parking spot) , my car produces two rattles - like marbles or a box of rocks. It is almost like relieving torque from the driveline causes a little "whiplash" forward from the transmision. This noise happens in every gear if the clutch pedal is depressed fairly rapidly.
The noise is very noticeable and passengers in the car have even commented. This does not happen (our I can't hear it) shifting from higher RPM or if the clutch is depressed slowly.

I am trying to arm myself with any info I can before going to GM service. donkingery@sbcglobal.net

 

I had what felt like clutch chatter on engagement in first or reverse when I first picked up my car. Mine is a very early 05. Dealer found the clutch fluid to be contaminated. He flushed the system and it really feels alot better. After putting a cat back system (Bullets) on the car, I find the clutch even easier to modulate because I can hear the RPM's much better. Take a look at your clutch fluid resevoir.

 

I've seen a couple of other posts about this, and yes, mine seems to take a couple of days to bleed down, I only drive it a couple of times a week. Maybe its just the way the car is, but I'm going to take it in next week anyway. I'm not very happy about letting Mr. Goodwrench have my car overnight just to hear him say, it didn't do it, but since I can complain about the chattering clutch at the same time, I'm going to chance it. Hopefully all it gets is dirty overnight at the stealership.

 

Document ID# 1722053
2005 Chevrolet Corvette



--------------------------------------------------------------------------------

6 Speed Shifter Rattle Growl Buzz Noise - keywords 5.7 boom clash clutch late lazy lo5 LS1 MM6 MN6 M12 neutral pinion shake vibration #PIP3104B - (Nov 3, 2005)
6-Speed Shifter Rattle Growl Buzz Noise
1997-2006 Chevrolet Corvette

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
Condition 1. 1997-2004 Corvette:

Shifter buzz noise at approximately 3000 RPM.

Condition 2. 1997-2006 Corvette:

Gear rattle or buzz noise at low RPM (below 1500 lugging the engine) or during engine shut down. Also neutral gear rattle noise with the transmission in neutral and the clutch engaged. These noises may be worse with the air condition compressor engaged.

Recommendation/Instructions:
Condition 1. 1997-2004 Corvette:

A revised shifter assembly with added isolation bushings is available as part number 10331311. Part numbers are subject to change so please use any updated part numbers if any become available.

Condition 2. 1997-2006 Corvette:

Gear rattle or buzz noise at low RPM (below 1500 lugging the engine), during engine shut down or also neutral gear rattle noise with the transmission in neutral and the clutch engaged are all normal operating characteristics of the 6-speed transmission. No repair attempts should be made on these conditions. Please refer to the latest version of informational service bulletin 03-07-29-004 which discusses normal operating characteristics of manual transmissions.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.



GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


© Copyright General Motors Corporation. All Rights Reserved.


--------------------------------------------------------------------------------
Document ID# 1722053
2005 Chevrolet Corvette

 

Document ID# 1679915
2005 Chevrolet Corvette



--------------------------------------------------------------------------------

Low Clutch Pedal - keywords 6sp abnormal cylinder flywheel grind hard height inoperative master M12 MM6 MZ6 performance shift slip #PIP3483 - (Jun 30, 2005)
Low Clutch Pedal
2005 Chevrolet Corvette

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
Abnormal clutch operation on 6-speed manual transmission vehicles. Most likely a low pedal or pedal mis-positioned.

Recommendation/Instructions:
Engineering has determined that some flywheels on vehicles built prior to May 18, 2005 may have been manufactured with the clutch cover mounting boss height being out of tolerance. This results in the clutch being out of position relative to the flywheel friction face. The nominal dimension is 11.7mm and flywheels recovered from vehicles exhibiting this problem have been found to be as small as 11.1mm.





Measure the boss height at all six locations to confirm that the part is within spec. If not the flywheel should be replaced.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.



GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


© Copyright General Motors Corporation. All Rights Reserved.


--------------------------------------------------------------------------------
Document ID# 1679915
2005 Chevrolet Corvette

 

The clutch on my 2005 C6 MN6 is slipping badly. Any chance it is related to the service bulletins noted here (i.e. can I get it fixed under warranty)? Car was delivered in Feb, 2005 and has less than 8500 miles on it.

thanks.

 

I would think so if the flywheel is out of spec.

Engineering has determined that some flywheels on vehicles built prior to May 18, 2005 may have been manufactured with the clutch cover mounting boss height being out of tolerance. This results in the clutch being out of position relative to the flywheel friction face. The nominal dimension is 11.7mm and flywheels recovered from vehicles exhibiting this problem have been found to be as small as 11.1mm.

A picture is worth a thousand words but didn't copy. The flywheel mounting boss is where the clutch plate bolts to the flywheel

 

Ok any info on this:
My clutch makes no noise, the car only has 130 miles on it but when I take off slowly, or engage the clutch slowly to park or just move around my driveway, the clutch feels like it is warped, almost like a rotor. When I beat on the car it seems fine, but moving slowly its very noticeable.

Thanks...
Dave

 

Take it in to the dealer and have the Mgr. drive it. Common problem and you have to replace clutch and flywheel to fix it.

Think safety! Would you let your mother drive this and have the clutch blow up? Ask the service Mgr.

 

A ton of threads regarding the manual is getting disconserting.

 

Dave

I have an 06 Z51 which I picked up 01 Nov 05. From day one we get the exact same symptoms!

All you can do is take it in, document it with a warranty complaint and if there is a clutch related issue down the road, you will have a lot better chance of getting some resolution by GM. By the way,, it drives the wife NUTS!

i'll give it 5-6K miles and se what happens.

bill c

 

I agree. I have an 06 Z51 on order and it IS concerning me. The scary thing is that I had a 6 speed 2000 Camaro SS that did the same ****. Its kinda sad that its still happening.

If it does this in my new Vette and doesnt get fixed, GM will have their car back and I will be done with GM.

 

I just got mine back from the dealer where they replaced the flywheel and the clutch master cylinder. A little background on my car-'05 M6 w/LG longtubes/LG tune/Halltech Stinger, after getting the mods put on by another chevy dealer-the clutch would "balloon" on the 1-2 shift. Car has 1900 miles on and really hasn't been abused. I think the added power exposed a weak clutch-anywho they said they flywheel was out of tolerances. Don't know if i;m completely satisfied yet, I may get a LS7 flywheel/clutch/pp assy at a later date-we'll see.

Car is strong tho-

Don't take this as blaming the mods-I couldn't be happier with LG-they have given me AWESOME service and i'm a customer for life!


Just a sh!tty GM clutch.