Tighten Clutch Pressure Plate Bolts . . .
CMNTMXR57 said:
I'm confused too!
Is this a clunk from slack in the driveline (which is standard on M6 cars)? Or is it a clunk from the hydraulics (when you push in the clutch)?
If it's the later, it's the throwout bearing being sucked in to release pressure on the pressure plate. Letting the clutch pedal back out allows the spring on the throw out to push the bearing back up against the pressure plate.
Information for Manual GTO owners . . .
Bulletin #04-07-31-003 released Jun 30, 2004 Loss of Pedal Height/Low Clutch Pedal, Clutch Does not Release Fully Untill Ful Pedal Travel, Difficulty Changing Gears (Tighten Clutch Pressure Plate Bolts)
2004 Pontiac GTO Built bPrior to VIN Breakpoint 4L234149 with manual transmission
Condition- Some customers may comment on progressive loss of pedal height (which, if not addressed, could result in the clutch not fully releasing until full pedal travel), difficulty in changing gears or a low clutch pedal.
Cause - Root cause analysis has identified that the clutch pressure plate bolt torque on vehicles produced before the above VIN breakpoint may loosen in service. This condition was corrected in production by increasing the torque of the clutch pressure plate bolts. This change became effective in vehicle production beginning with VIN 4L234149, built on 2/11/04.
Correction - IMPORTANT
* This correction MUST be performed before retail delivery of new vehicles built prior to VIN breakpoint 4L234149.
* Whenever performing repairs to the clutch assembly on vehicles built prior to and after the specified VIN breakpoint, ensure thal all six pressure plate retaining bolts are tightened in sequence as shown in the illustration.
Apply additional torque to the clutch pressure plate-to-flywheel bolts to the revised torque specification of 70 Nm +/- 7 Nm (52 lb ft +/- 5 lb ft). Follow the tightening sequence shown in the illustration.
Using a clock pattern as illustration: (star pattern)
1st bolt at 12:00
2nd bolt at 4:00
3rd bolt at 8:00
4th bolt at 2:00
5th bolt at 6:00
6th bolt at 10:00
Tighten the bolts in sequence in 4 steps:
1. Tighten all bolts to 15 Nm (11 lb ft)
2. Tighten all bolts to 35 Nm (26 lb ft)
3. Tighten all bolts to 55 Nm (41 lb ft)
4. Tighten all bolts to 70 Nm (52 lb ft)