Topic: Clutch Pedal Vibration /Hard to Shift gears /Leaking trans fluid/M20
in Forum: C3 Driveline Components
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macedon, NY - USA
Joined: 7/20/2006
Posts: 367
Vette(s): 68 COUPE 454
HAS MOTION HOOD SCOOP, REVERSED GILLS
ZL-1 FENDER FLARES AND
MOTION REAR SPOILER, LEMAN'S GAS CAP,
BUCKET HEADLIGHTS.
CAN-AM FRONT
RACING SPOILER. CHROME HOOKER HEADERS AND SIDE PIPES! 4 SPEED M20,
LOOKS FAST STANDING STILL !!
For those at Carlisle you've heard this story.
10 minutes from leaving my house for Carlisle my clutch Pedal starts vibrating enough to make some noise.
Later when I stopped for gas the car VIBRATED VERY BAD when taking off in 1st.
Went thru gears hard. This happened every light. When I got to Carlisle I was leaking trans fluid. Chevy dealership said they could not do anything with out dropping tranny except clean up the underneath and top off the tranny fluid. There were times I could not use 1st, 2nd, or 3rd. I had to start off in 4th.
Pedal has to be pushed all the way to floor for shifting also.
On the way home thing shifted pretty good. After arriving home there was a puddle of tranny fluid on the garage floor.
So any ideas ?????
Thanks
Joe
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20218
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
WHY could you not use 1-2-3? Would it not physically shift into those gears, or was the vibration too much in those gears?
The leak sounds like it is leaking from the front of the trans. Problem is, there is NO seal on the front to leak. The input shaft goes thru the front bearing, and a nut holds it together. The nut is specific to this shaft/trans, and MUST be installed with the smooth side towards the front of the car, which puts the flats of the nut towards the trans. It takes a nifty wrench to install the nut. If the nut is installed backwards, it can rub on the bearing retainer, and start a leak. Overfilling the trans will also cause it to leak from the front. Leaking gear lube onto the clutch can certainly cause it to shudder on take-off.
The only other place for gear lube to exit the front of the trans is from the countershaft. There is also no seal there, either. It is a tight fit into the case, and that is all that seals it. I always run a bit of sillycone around it to seal it.
Get that thing up in the air and see if you can determine where the leak is....
The leak sounds like it is leaking from the front of the trans. Problem is, there is NO seal on the front to leak. The input shaft goes thru the front bearing, and a nut holds it together. The nut is specific to this shaft/trans, and MUST be installed with the smooth side towards the front of the car, which puts the flats of the nut towards the trans. It takes a nifty wrench to install the nut. If the nut is installed backwards, it can rub on the bearing retainer, and start a leak. Overfilling the trans will also cause it to leak from the front. Leaking gear lube onto the clutch can certainly cause it to shudder on take-off.
The only other place for gear lube to exit the front of the trans is from the countershaft. There is also no seal there, either. It is a tight fit into the case, and that is all that seals it. I always run a bit of sillycone around it to seal it.
Get that thing up in the air and see if you can determine where the leak is....
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
|UPDATED|8/28/2012 10:35:04 AM (AZT)|/UPDATED|
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Send PM
macedon, NY - USA
Joined: 7/20/2006
Posts: 367
Vette(s): 68 COUPE 454
HAS MOTION HOOD SCOOP, REVERSED GILLS
ZL-1 FENDER FLARES AND
MOTION REAR SPOILER, LEMAN'S GAS CAP,
BUCKET HEADLIGHTS.
CAN-AM FRONT
RACING SPOILER. CHROME HOOKER HEADERS AND SIDE PIPES! 4 SPEED M20,
LOOKS FAST STANDING STILL !!
Adams' Apple said: WHY could you not use 1-2-3? Would it not physically shift into those gears, or was the vibration too much in those gears?
The leak sounds like it is leaking from the front of the trans. Problem is, there is NO seal on the front to leak. The input shaft goes thru the front bearing, and a nut holds it together. The nut is specific to this shaft/trans, and MUST be installed with the smooth side towards the front of the car, which puts the flats of the nut towards the trans. It takes a nifty wrench to install the nut. If the nut is installed backwards, it can rub on the bearing retainer, and start a leak. Overfilling the trans will also cause it to leak from the front. Leaking gear lube onto the clutch can certainly cause it to shudder on take-off.
The only other place for gear lube to exit the front of the trans is from the countershaft. There is also no seal there, either. It is a tight fit into the case, and that is all that seals it. I always run a bit of sillycone around it to seal it.
Get that thing up in the air and see if you can determine where the leak is....
The leak sounds like it is leaking from the front of the trans. Problem is, there is NO seal on the front to leak. The input shaft goes thru the front bearing, and a nut holds it together. The nut is specific to this shaft/trans, and MUST be installed with the smooth side towards the front of the car, which puts the flats of the nut towards the trans. It takes a nifty wrench to install the nut. If the nut is installed backwards, it can rub on the bearing retainer, and start a leak. Overfilling the trans will also cause it to leak from the front. Leaking gear lube onto the clutch can certainly cause it to shudder on take-off.
The only other place for gear lube to exit the front of the trans is from the countershaft. There is also no seal there, either. It is a tight fit into the case, and that is all that seals it. I always run a bit of sillycone around it to seal it.
Get that thing up in the air and see if you can determine where the leak is....
Adam, It would not physically shift into those gears.
when i had it at the dealership, we / I looked like it was coming from the front, but will recheck.
I will clean it off and get it to my mechanic and see where the leak is.
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macedon, NY - USA
Joined: 7/20/2006
Posts: 367
Vette(s): 68 COUPE 454
HAS MOTION HOOD SCOOP, REVERSED GILLS
ZL-1 FENDER FLARES AND
MOTION REAR SPOILER, LEMAN'S GAS CAP,
BUCKET HEADLIGHTS.
CAN-AM FRONT
RACING SPOILER. CHROME HOOKER HEADERS AND SIDE PIPES! 4 SPEED M20,
LOOKS FAST STANDING STILL !!
One thing that was mention by some gear heads at carlisle was it could be the pressure plate, may have lost some? fingers.
pressure plate, clutch , throw out bearing were all new.
flywheel was balanced.

Moderator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20218
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
The clutch doesn't leak. Most likely what has happened, from your description, is you have a trans leak from the front. The gear lube got onto the clutch disc, and it is now sticking to the pp and flywheel, making it hard, if not impossible to get it into gear. It is possible there is something else going on with the clutch, certainly, but nothing in the clutch would make the trans leak...unless something on the clutch broke, and it poked a hole in the case....I think you would have heard an awful racket if that happened.
In any case, it certainly appears that you're gunna wind up pulling the trans/clutch back out....
That really sux, but at least you did make it to the event, and back home.
In any case, it certainly appears that you're gunna wind up pulling the trans/clutch back out....

That really sux, but at least you did make it to the event, and back home.

Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
Standard Member
Send PM
macedon, NY - USA
Joined: 7/20/2006
Posts: 367
Vette(s): 68 COUPE 454
HAS MOTION HOOD SCOOP, REVERSED GILLS
ZL-1 FENDER FLARES AND
MOTION REAR SPOILER, LEMAN'S GAS CAP,
BUCKET HEADLIGHTS.
CAN-AM FRONT
RACING SPOILER. CHROME HOOKER HEADERS AND SIDE PIPES! 4 SPEED M20,
LOOKS FAST STANDING STILL !!
Ok, Pulled the tranny yesterday.
I think I found the reason for the leaking tranny fluid , Vibrating clutch and Hard shifting.
But not sure, can anyone confirm that this might be the problem??



Joe
I think I found the reason for the leaking tranny fluid , Vibrating clutch and Hard shifting.
But not sure, can anyone confirm that this might be the problem??



Joe

Moderator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20218
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
(in yer best Joe Dirt voice...)DAAAANG! 
Where's the rest of it? Only a couple of reasons for this to happen. either the bearing retainer was already cracked/damaged, or there is a problem with the clutch/flywheel not running straight. I have seen bearing retainers snap the snout off, but have NEVER seen one break into two pieces like that...(actually THREE pieces).
And, again....DAAAANG!

Where's the rest of it? Only a couple of reasons for this to happen. either the bearing retainer was already cracked/damaged, or there is a problem with the clutch/flywheel not running straight. I have seen bearing retainers snap the snout off, but have NEVER seen one break into two pieces like that...(actually THREE pieces).
And, again....DAAAANG!

Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
Standard Member
Send PM
macedon, NY - USA
Joined: 7/20/2006
Posts: 367
Vette(s): 68 COUPE 454
HAS MOTION HOOD SCOOP, REVERSED GILLS
ZL-1 FENDER FLARES AND
MOTION REAR SPOILER, LEMAN'S GAS CAP,
BUCKET HEADLIGHTS.
CAN-AM FRONT
RACING SPOILER. CHROME HOOKER HEADERS AND SIDE PIPES! 4 SPEED M20,
LOOKS FAST STANDING STILL !!
Yup, that was kinda my feelings also!
He thought the same thing that it may have had a crack in it .
Good part about it is the guy I bought the tranny from is standing by it. He has a replacement retainer for me and is looking the transmission over.
I need to throw some brake clean on the clutch / pressure plate and bell housing which I also took off.
I should have it back tomorrow, sat, but will not put in back in the car till tuesday night due to the holiday weekend.
My buddy owns a garage and he said I could work on it over the weekend if I wanted, he would give me his keys to the place.
But I think it can wait.
Joe
He thought the same thing that it may have had a crack in it .
Good part about it is the guy I bought the tranny from is standing by it. He has a replacement retainer for me and is looking the transmission over.
I need to throw some brake clean on the clutch / pressure plate and bell housing which I also took off.
I should have it back tomorrow, sat, but will not put in back in the car till tuesday night due to the holiday weekend.
My buddy owns a garage and he said I could work on it over the weekend if I wanted, he would give me his keys to the place.
But I think it can wait.
Joe
Man, Joe, it's a miracle you made it home! Glad you found the problem and the tranny guy is helping out. Hope to see you at one of the later shows! Glad tro have met you at Carlisle!

Barry

in Forum: C3 Driveline Components
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