can't shift into gear
Thread Starter
Burning Brakes
Joined: Mar 2009
Posts: 1,000
Likes: 40
From: Houston TX
can't shift into gear
Hey guys, need some help:
I have a 1992 LT1 with 29k miles. The clutch hydraulic system starting taking on air and would not allow me to disengage the clutch. I would bleed the air out, things would be fine for a few days, but eventually take on enough air that the problem would come back. I just replaced the master and slave cylinders assuming age degraded the seals.
The problem is that the clutch is not disengaging now (stuck in neutral while engine is running) and it's very squeaky in the clutch area when I move the clutch pedal back and forth. I'm confident all the air is out because the squeak means the slave is pushing something. I'm pretty sure the slave is connected properly with the clutch fork (I can explain why if you need more info).
Is it possible that by putting in new slave and master cylinders, the system was able to generate enough force to finally break something in the clutch motion mechanism? Which bearing is sometimes the culprit of a "noisy" clutch (I forget)?
Thanks!
I have a 1992 LT1 with 29k miles. The clutch hydraulic system starting taking on air and would not allow me to disengage the clutch. I would bleed the air out, things would be fine for a few days, but eventually take on enough air that the problem would come back. I just replaced the master and slave cylinders assuming age degraded the seals.
The problem is that the clutch is not disengaging now (stuck in neutral while engine is running) and it's very squeaky in the clutch area when I move the clutch pedal back and forth. I'm confident all the air is out because the squeak means the slave is pushing something. I'm pretty sure the slave is connected properly with the clutch fork (I can explain why if you need more info).
Is it possible that by putting in new slave and master cylinders, the system was able to generate enough force to finally break something in the clutch motion mechanism? Which bearing is sometimes the culprit of a "noisy" clutch (I forget)?
Thanks!
Safety Car
Joined: Apr 2011
Posts: 3,660
Likes: 22
yep, pretty much.
I could be wrong here in the way this clutch system operates.....some cars use a slave cyl instead of a throwout bearing to carry the disk away..others use a hyd master cyl to move a fork on a throw out bearing...If you have the fork in the bellhousing yours may be the hybrid type...(for lack of proper term) hyd topside and mechanical below. Chattering is usually a sign of TB failure. I am not familiar with slave cyl operation and what the symptoms would be.
Sounds like TB to me...
I could be wrong here in the way this clutch system operates.....some cars use a slave cyl instead of a throwout bearing to carry the disk away..others use a hyd master cyl to move a fork on a throw out bearing...If you have the fork in the bellhousing yours may be the hybrid type...(for lack of proper term) hyd topside and mechanical below. Chattering is usually a sign of TB failure. I am not familiar with slave cyl operation and what the symptoms would be.
Sounds like TB to me...
Team Owner
Joined: Aug 2005
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From: Riverside County Southern California
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yep, pretty much.
I could be wrong here in the way this clutch system operates.....some cars use a slave cyl instead of a throwout bearing to carry the disk away..others use a hyd master cyl to move a fork on a throw out bearing...If you have the fork in the bellhousing yours may be the hybrid type...(for lack of proper term) hyd topside and mechanical below. Chattering is usually a sign of TB failure. I am not familiar with slave cyl operation and what the symptoms would be.
Sounds like TB to me...
I could be wrong here in the way this clutch system operates.....some cars use a slave cyl instead of a throwout bearing to carry the disk away..others use a hyd master cyl to move a fork on a throw out bearing...If you have the fork in the bellhousing yours may be the hybrid type...(for lack of proper term) hyd topside and mechanical below. Chattering is usually a sign of TB failure. I am not familiar with slave cyl operation and what the symptoms would be.
Sounds like TB to me...
Race Director
Joined: Dec 2000
Posts: 17,551
Likes: 26
From: El Paso Texas
yep, pretty much.
I could be wrong here in the way this clutch system operates.....some cars use a slave cyl instead of a throwout bearing to carry the disk away..others use a hyd master cyl to move a fork on a throw out bearing...If you have the fork in the bellhousing yours may be the hybrid type...(for lack of proper term) hyd topside and mechanical below. Chattering is usually a sign of TB failure. I am not familiar with slave cyl operation and what the symptoms would be.
Sounds like TB to me...
I could be wrong here in the way this clutch system operates.....some cars use a slave cyl instead of a throwout bearing to carry the disk away..others use a hyd master cyl to move a fork on a throw out bearing...If you have the fork in the bellhousing yours may be the hybrid type...(for lack of proper term) hyd topside and mechanical below. Chattering is usually a sign of TB failure. I am not familiar with slave cyl operation and what the symptoms would be.
Sounds like TB to me...
Safety Car
Joined: Apr 2011
Posts: 3,660
Likes: 22
haha alright...
the technical term for this particular bearing is the "PILOT BEARING" ..the fork rides on that and is the mechanism that engages or disengages the clutch plate.
If the pilot bearing is junk....no clutch.
Pilot bearing is just a fancy new name for throw-out bearing that did the same task before hydraulics came into the picture...
the technical term for this particular bearing is the "PILOT BEARING" ..the fork rides on that and is the mechanism that engages or disengages the clutch plate.
If the pilot bearing is junk....no clutch.
Pilot bearing is just a fancy new name for throw-out bearing that did the same task before hydraulics came into the picture...
Drifting
Joined: Jun 2010
Posts: 1,853
Likes: 8
From: Westerly RI
haha alright...
the technical term for this particular bearing is the "PILOT BEARING" ..the fork rides on that and is the mechanism that engages or disengages the clutch plate.
If the pilot bearing is junk....no clutch.
Pilot bearing is just a fancy new name for throw-out bearing that did the same task before hydraulics came into the picture...
the technical term for this particular bearing is the "PILOT BEARING" ..the fork rides on that and is the mechanism that engages or disengages the clutch plate.
If the pilot bearing is junk....no clutch.
Pilot bearing is just a fancy new name for throw-out bearing that did the same task before hydraulics came into the picture...
To the O/P- if your car has only 29k miles, the clutch should be as new. There was an issue, well documented, of OEM clutch cyls being defective, which could have been your original problem. If you are hearing a squeak on pressing the clutch pedal, it could be caused by using brake fluid in the system. If you now have a problem that didn't exist before, I would recheck the cylinder installation etc. as these systems are not too complicated. It is highly unlikely that an internal problem has appeared coincidentally with your repair.
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Drifting
Joined: Jun 2010
Posts: 1,853
Likes: 8
From: Westerly RI
If you can look at, or visualize, the input shaft on a manual trans, the end of it has a smooth, round section beyond the splines for the clutch plate. This is the part that goes into the pilot bearing.
The shift fork operates the throwout bearing, which controls the pressure plate, and releases or engages the clutch in response to the clutch pedal. In the LT1 setup, the throwout bearing turns as long as the engine is running, and functions as a "pull-type" assembly.
Not sure what you mean by "main pilot bearings... supporting the connecting rods"
Last edited by sailorsteve; Dec 14, 2011 at 04:27 PM.
Racer
Joined: Dec 2008
Posts: 297
Likes: 19
From: arlington TX
Hi,
Was the slave cylinder you took out bad - leaking fluid past seals, etc? If it still worked (even though you had to "bleed air after a few days"), put it back in and see if it starts working again.
Maybe the replacement is the wrong one - not enough stroke, etc? 29k is REALLY low milage to have those problems. Did the new one look like the old one?
Just a few thoughts ...not relating to throwout bearings, pilot bearings, etc. :-)
Good luck.
walt z.
Was the slave cylinder you took out bad - leaking fluid past seals, etc? If it still worked (even though you had to "bleed air after a few days"), put it back in and see if it starts working again.
Maybe the replacement is the wrong one - not enough stroke, etc? 29k is REALLY low milage to have those problems. Did the new one look like the old one?
Just a few thoughts ...not relating to throwout bearings, pilot bearings, etc. :-)
Good luck.
walt z.
