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LS1 Swap Hydraulic Clutch Mess

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Old Jul 12, 2011 | 10:11 PM
  #1  
DerrenZ's Avatar
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From: Hillsboro, Oregon
Car: 1986 IROC
Engine: LS1
Transmission: T56
Axle/Gears: 3.23 Posi
LS1 Swap Hydraulic Clutch Mess

I'm working with a T56/LS1 dropout that was pulled and shipped to me as a unit.

I connected the hydraulic clutch that was provided to the side of the T56. From my homework I thought it was supposed to push in and lock. It appears to have done so.

After checking that the master cylinder fluid reservoir was filled, I pushed the clutch pedal to the floor twice with no resistance. The reservoir is now empty and the fluid is dripping from the bottom of the bell housing where it meets the engine.

What went wrong? Is the fitting not seated properly in the side of the T56? Did I screw up something inside?

The fitting looks like it could go in further, but it doesn't. And it's not falling off, I pulled hard and it seems to be locked in.

What have I done?!
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Old Jul 12, 2011 | 11:06 PM
  #2  
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From: Hillsboro, Oregon
Car: 1986 IROC
Engine: LS1
Transmission: T56
Axle/Gears: 3.23 Posi
Re: LS1 Swap Hydraulic Clutch Mess

The receiver side of this connection, the part that is on the tranny (the slave cylinder itself I believe) is kinda loose and wobbly. From one of the pics I have seen, I would think that this should be installed very solid.

Should it have any slop or play at the fitting that protrudes from the T56?
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Old Jul 12, 2011 | 11:26 PM
  #3  
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From: Hillsboro, Oregon
Car: 1986 IROC
Engine: LS1
Transmission: T56
Axle/Gears: 3.23 Posi
Re: LS1 Swap Hydraulic Clutch Mess

Much of the fluid is going inside the bell housing, but it also squirts out around the connection spraying on the outside of the tranny, the exhaust, etc.

Are these symptoms consistent with a failed slave cylinder?
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Old Jul 12, 2011 | 11:49 PM
  #4  
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From: Hillsboro, Oregon
Car: 1986 IROC
Engine: LS1
Transmission: T56
Axle/Gears: 3.23 Posi
Re: LS1 Swap Hydraulic Clutch Mess

I disconnected the clutch line from the housing. I think it was snapped in correctly.

The fitting on the tranny side spins if I try to rotate it with my fingers. Is this normal?

This dropout came from a very reputable seller and only had reportedly 31k. Looks good otherwise, hard to believe it would show up with a bad slave cylinder...
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Old Jul 13, 2011 | 11:41 AM
  #5  
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From: In the Garage
Car: Camaro
Engine: 6.2L
Transmission: T56
Re: LS1 Swap Hydraulic Clutch Mess

Are you sure the small o-ring is still on the end of the male part of the line that snaps into the fitting on the slave? Post some pics and/or vids of whats going on would help a solid diagnosis here
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Old Jul 13, 2011 | 01:58 PM
  #6  
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From: Hillsboro, Oregon
Car: 1986 IROC
Engine: LS1
Transmission: T56
Axle/Gears: 3.23 Posi
Re: LS1 Swap Hydraulic Clutch Mess

I just popped the fitting out and double checked-the O-ring is still in place. Attached is a pic of the area.

The female portion of this connection is wobbly and I can rotate it with my fingers.

Fluid gushes out if I have a helper push the pedal even part way down. And the first time I tried it I never felt any resistance, so if the slave is blown, I think I received it that way.

Should this female fitting be rigidly affixed to the slave cylinder?

Do I need to pull tranny and bell housing to replace the slave?

Name:  Slave_Cylinder_Q_Capture.png
Views: 1256
Size:  916.4 KB

http://i1183.photobucket.com/albums/..._Q_Capture.png
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Old Jul 13, 2011 | 02:25 PM
  #7  
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From: Hillsboro, Oregon
Car: 1986 IROC
Engine: LS1
Transmission: T56
Axle/Gears: 3.23 Posi
Re: LS1 Swap Hydraulic Clutch Mess

I used a mirror to get some pics of the female fitting. Everything looks fine.

It appears that the connection between this fitting and the slave cylinder is faulty.

Am I correct that this fitting attaches to the slave cylinder and the slave cylinder kind of goes around the shaft housing? If so, how is this female hydraulic fitting attached to the slave cylinder?

Some pics of the female side just for fun.

http://i1183.photobucket.com/albums/...1/IMG_4393.jpg
http://i1183.photobucket.com/albums/...1/IMG_4395.jpg
http://i1183.photobucket.com/albums/...1/IMG_4397.jpg
http://i1183.photobucket.com/albums/...1/IMG_4398.jpg
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Old Jul 13, 2011 | 03:27 PM
  #8  
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From: Hillsboro, Oregon
Car: 1986 IROC
Engine: LS1
Transmission: T56
Axle/Gears: 3.23 Posi
Re: LS1 Swap Hydraulic Clutch Mess

After looking over the mess, and doing some homework, I suspect there is a problem at the connection of the female fitting to the slave cylinder:

Name:  Slave_Cylinder_Image.png
Views: 1650
Size:  647.9 KB

http://i1183.photobucket.com/albums/...nder_Image.png

Most dropouts come from wrecked vehicles, I'm inclined to believe this had been operational but maybe was damaged when the motor/trans was pulled.

Has anyone ever seen a failure of this connection?

Could damage have occurred as a result of failing to disconnect the hydraulic line before pulling the motor?
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Old Jul 13, 2011 | 03:41 PM
  #9  
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From: In the Garage
Car: Camaro
Engine: 6.2L
Transmission: T56
Re: LS1 Swap Hydraulic Clutch Mess

You are sure the bleeder is tight?
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Old Jul 13, 2011 | 04:24 PM
  #10  
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From: Hillsboro, Oregon
Car: 1986 IROC
Engine: LS1
Transmission: T56
Axle/Gears: 3.23 Posi
Re: LS1 Swap Hydraulic Clutch Mess

Great thought!

But sadly, yes, the bleeder is tight...

It looks like I will be pulling my tranny and bell housing before I even got to turn it over.

Sigh...
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Old Jul 13, 2011 | 04:27 PM
  #11  
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From: In the Garage
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Engine: 6.2L
Transmission: T56
Re: LS1 Swap Hydraulic Clutch Mess

Rough situation man I feel for ya
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Old Jul 13, 2011 | 06:32 PM
  #12  
DerrenZ's Avatar
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From: Hillsboro, Oregon
Car: 1986 IROC
Engine: LS1
Transmission: T56
Axle/Gears: 3.23 Posi
Re: LS1 Swap Hydraulic Clutch Mess

Actually, is it possible to replace the slave cylinder without removing the bell housing? Do I only need to pull the trans off the bell housing?
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Old Jul 13, 2011 | 07:06 PM
  #13  
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From: Humid Houston on the Texas coast
Car: '86 Z28
Engine: SDPC TPI 350
Transmission: WC T5
Axle/Gears: 3.23 posi
Re: LS1 Swap Hydraulic Clutch Mess

Originally Posted by DerrenZ
Actually, is it possible to replace the slave cylinder without removing the bell housing? Do I only need to pull the trans off the bell housing?
Yep!

M
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Old Jul 14, 2011 | 09:53 AM
  #14  
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From: Canada,Ont
Car: 1987 TransAm Ttop
Engine: 2005 LQ4
Transmission: Ls1 T56
Axle/Gears: 3:54
Re: LS1 Swap Hydraulic Clutch Mess

ouch that sucks man.i took the advice of everyone on here that say when ever you do a swap and buy a used t56 to replace the slave with a new gm hd unit.I didnt want to go through this exact issue.

shouldnt be too bad of a job to replace the slave if you just pull the trans off the bell housing.im assuming you dont have the rest of the driveline together yet so its not a chore to take the drive shaft etc all back off.
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Old Jul 14, 2011 | 05:18 PM
  #15  
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From: Hillsboro, Oregon
Car: 1986 IROC
Engine: LS1
Transmission: T56
Axle/Gears: 3.23 Posi
Re: LS1 Swap Hydraulic Clutch Mess

Thanks guys.

I actually had pretty much everything installed and tied in except for the wiring. I had just assumed it work.

So much so that I didn't even plan to test it, I only pushed the clutch to check my pedal linkage and lo and behold, no resistance.

Probably better to discover it now than when I'm ready to start it up.

And the party that provided the motor/trans deals in engines and parts, and they are shipping me a replacement slave cylinder today, no charge.
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