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YJ Internal Slave Cylinder 
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Joined: Tue Feb 13, 2007 4:37 am
Posts: 3130
Location: Green Bay, WI
Post YJ Internal Slave Cylinder
You know, the ones that get air in the system but don't leak any fluid out :bang: When I got my jeep back in '01 the slave did this, bleed it and it was good for a few days, I replaced it and ten years later its doing it again. Does anyone know or heard of exactly what part of the slave or line fails and allows the air in?? Is this specific leak repairable or preventable??

2 out of the four parts stores I called have it listed as 0 in stock and NONE in their warehouses, unknown when they will be available. I knew it was a common problem but didn't they use the internal slave on only a few years??

Zach571

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Sat Mar 19, 2011 11:33 am
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Joined: Thu Jan 28, 2010 7:41 pm
Posts: 325
Location: Neenah Wi
Post Re: YJ Internal Slave Cylinder
I found a post about using a S10 slave cyl on a Jeep
http://www.jeeptech.com/convtrans/sm420yj/ Hope it help's

Jay

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Sat Mar 19, 2011 12:03 pm
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Joined: Tue Feb 13, 2007 4:37 am
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Location: Green Bay, WI
Post Re: YJ Internal Slave Cylinder
Rhinobuggie wrote:
I found a post about using a S10 slave cyl on a Jeep
http://www.jeeptech.com/convtrans/sm420yj/ Hope it help's

Jay


I'm afraid not, that is talking about swapping a completely different transmission in, not just a slave cylinder.

Zach571

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Sat Mar 19, 2011 1:03 pm
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Joined: Mon Feb 08, 2010 4:38 pm
Posts: 1069
Location: Chippewa Falls, WI
Post Re: YJ Internal Slave Cylinder
yes zach they only did internal for a few years i want to say they stopped in the tj line up but i dont have a date off the top of my head. and i would assume its the seal on the piston that allows the air to bleed in although i dont know why it never leaks out their though.can you bleed it or is the bleeder to rusted up i know on wf their were a lot of guys that said they bleed theirs yearly. theirs a guy on here from that site jpdocdave hes really good with jeeps send him a email he would know if theirs another slave that you could use to prevent it from happening again.

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Sun Mar 20, 2011 6:51 am
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Joined: Wed Nov 07, 2007 5:59 pm
Posts: 252
Post Re: YJ Internal Slave Cylinder
Zach,

Internal slaves were used from 85 till 93/94. After that they used an external unit. What alot of guys do to up grade is find the 95 and later bell housing to use the external set up. As for repairing what you have I'm not sure if any/many have attempted it. More then likely a seal/oring as stated before. Most are of the opinion if your into it far enough to take it out you might as well replace it instead of taking a chance on repairing it. Have you tried Rock auto, 4wd hardware, Quadratec, or Morris 4x4?

Anders


Sun Mar 20, 2011 5:18 pm
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Joined: Tue Sep 18, 2007 6:17 pm
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Location: West Bend
Post Re: YJ Internal Slave Cylinder
in my opinion the external slaves are not any better,
when you take them off the piston moves out beond
where it has been before and they never work again.

Cgb

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Sun Mar 20, 2011 8:22 pm
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Joined: Wed Nov 07, 2007 5:59 pm
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Post Re: YJ Internal Slave Cylinder
Cgb wrote:
in my opinion the external slaves are not any better,
when you take them off the piston moves out beond
where it has been before and they never work again.

Cgb


You are correct that sometimes if you take them out they can over extend and not work properly (although I have not seen it happen very often myself). However, were they become an up grade is that you don't have to pull the whole trans to replace them. Simply unbolt and replace, much simpler and faster.


Sun Mar 20, 2011 8:33 pm
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Joined: Tue Sep 18, 2007 6:17 pm
Posts: 1189
Location: West Bend
Post Re: YJ Internal Slave Cylinder
This is a cool article , my nephew is on his 3rd slave, so i found this for him.

http://www.universityofjeep.ca/Tech/Clutch/Clutch_Slave_Repair.htm

Cgb

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Wed Mar 23, 2011 9:30 pm
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