C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Clutch Problems!?!?!

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Old May 28, 2012 | 04:31 PM
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Default Clutch Problems!?!?!

A little history... I've been going through divorce and moving the past couple of years, so my car been in storage a lot ... the car was parked for approx one year... I went to move it and the clutch disengagement was really high (toward the very top of the pedal)... it was releasing in the middle & working perfectly fine prior to sitting for a year. At that point it was driven to another storage unit where it sat until recently... it was there about another year and half. I finally went to move it out, start driving it again, etc... and the freaking clutch won't disengage at all!?!?! I had it towed to my new house. It would start in netural, but it wouldn't physically go into gear running with the clutch pedal on the floor. It will row though the gears when it’s not running. Thinking it was just somehow developed air in the hydraulics, I (w/ help) did the GM recommended bleed down method (with the slave disconnected/inverted) 2x... didn't help... reverse bleed w/ a pump (from the slave bleeder up)... didn't help... shorten the adjustable rod (all the way) on the Mcleod MC & reverse bleed again... and now it will physically go into gear with the motor running, but the clutch still won't disengage

Kinda running outta ideas here.... What do you guys suggest trying next???
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Old May 28, 2012 | 04:37 PM
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So, engine idling, you can put the shifter into any gear, without clashing or grinding, with the clutch depressed?
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Old May 28, 2012 | 04:40 PM
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Originally Posted by VetteMed
So, engine idling, you can put the shifter into any gear, without clashing or grinding, with the clutch depressed?
Correct.... I couldn't before shortening the master rod & reverse bleed, but now I can.
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Old May 30, 2012 | 01:25 PM
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Anybody??
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Old May 30, 2012 | 01:47 PM
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I'm stumped, it just doesn't make any sense to me.

If the clutch hydraulics weren't allowing enough pull on the pressure plate, then there should be difficulty getting into gear at idle.

If there's no difficulty with selecting a gear at idle, then that tells us the clutch plate is being released by the pressure plate when you push the clutch in (which is what's supposed to happen). That, or it's not being clamped at all, for some strange reason.

I'd be curious to see if you can put the trans in gear without depressing the clutch.

If you can put the trans in gear without pushing in the clutch, then I think you need to take the trans out to examine the clutch assembly firsthand.
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Old May 30, 2012 | 02:43 PM
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Originally Posted by LT4POWR
but the clutch still won't disengage

Kinda running outta ideas here.... What do you guys suggest trying next???
I'm wondering if there is a layer of corrosion (rust) build up that prevents disengagement of the pressure plate/clutch, clutch/flywheel. friction surface's
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Old May 30, 2012 | 03:43 PM
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Originally Posted by desertmike1
I'm wondering if there is a layer of corrosion (rust) build up that prevents disengagement of the pressure plate/clutch, clutch/flywheel. friction surface's
I thought of that too, but talked myself out of it, since that should prevent the trans from going into gear even with the clutch depressed. It would keep the clutch disc and input shaft constantly turning at engine rpm.
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Old May 30, 2012 | 04:16 PM
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[QUOTE=LT4POWR;1580929203] now it will physically go into gear with the motor running, but the clutch still won't disengage QUOTE]

This makes no sense...if you put a Tranny into gear while the Engine is running...somehow!

And at the same time are unable to disengage the mechanical coupling between the Engine and Trans, the car should take off on it's own.

OP could you re-think about this statement, Does it really fit the problem?
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Old May 30, 2013 | 02:47 PM
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Originally Posted by desertmike1
I'm wondering if there is a layer of corrosion (rust) build up that prevents disengagement of the pressure plate/clutch, clutch/flywheel. friction surface's
You were correct! Got it going again last week... then it (and my house) barely missed the big tornado Anyway, now (after three years) I can finally drive it again!!!

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