C6 clutch question

[eboch]

Done. Thanks.

eboch

... so the throw-out (and slave) were not done ... turns out the service item actually pertained to an over-center spring replacement. The info I had was incorrect. Thanks.

So the clutch fluid was apparently not adjusted or altered by GM during any of the VIS-listed service actions on the vehicle ... which is consistent with what GM Warranty is telling me.

eboch

 

[eboch]

I removed the over-center spring on the pedal to see if the pedal would return .... surprise .... after 2 or 3 pedal pumps the pedal started returning perfectly 100% of the time. Also the stand-still shifting problem seemed to dissappear (!). My thought was that the spring is somehow preventing the pedal return and this is limiting the master cylinder hydraulic recharge and thrust range..... which in-turn was causing incomplete clutch separation and therefore affecting shifting (particularly when the transmission is not spun up at stand-still). So the clutch hyrdraulics, after a bleed and GM DOT4 fluid change seem to be OK and have no problem returning the pedal .... when the over-center spring is removed.

Further inspection of my over-center spring indicated that it is very slightly deformed. I adjusted its shape several times and re-installed but could not quite get rid of the pedal return bind. I'm going to order a new spring and try it.

eboch

 

[eboch]

c4c5;

The local Corvette dealer tells me that the over-center pedal spring GM PN is 10-376347. He told me that the spring PN is the same on all 05-08 C6's (including Z06). He did say it is a "new" part number and so it may be a redesigned part for all of the C6's .... but he was not sure/certain.

Are there other spring options out there that might better might better ensure smooth/correct clutch & pedal operation?

eboch

 

[c4c5specialist]

HI there,
Thats the latest Canadian part number.
Use that.
Then reevaluate the condition.
Allthebest, c4c5

 

[eboch]

I got the new over-center pedal spring. Looking at it compared to the old spring, the spring clip points are significantly different than the old spring .. so the old one was; a) worn or altered, or b) designed differently.

I installed the new spring and the pedal and hydraulics seem to work fine. Not as smooth as operation without the spring though..... as you'd expect since the spring pulls the pedal up on the upper part of the pedal range and assists the push down on the lower part of the pedal range.

As a side note, when I was at the dealer, they showed me the fluid they'd taken out of my clutch hydraulics .... it looked like two fluids mixed together...one clear and one dark. Oddly, they mixed like peanut oil and water and would then separate almost immediately after shake-mixing. This is nothing like the way water or 10W30 mixes with DOT4 or 5 (...yes... I did some garage experiments). The dealer's observation was that there were 2 very different, totally incompatible fluids in it ... telling them it was not just "dirty" DOT4 ... which is what they said they based their warranty denial on.

Anyway...I'm hoping its all OK for now.

eboch