Slave cylinder keeps over extending

[stephenjeep]

Hi, I have a 93 4.0 5 speed ranger. I have had the slave cylinder replaced 3 time. First was a bout a year ago with one from Autozone. After asking here I bought a LUK brand from rock auto. It lased a bout 45 days and started draining the resivore. I took it out and replaced with another LUK from rock auto. It now is draining the cluth resivore again. The first 2 looked as if it was over extending and leaking around the collar. I have now had the transmission out 3 time with a fouth coming. Is there anything I need to konw? It has the correct plate between the engine and transmission. Should there be a shim or something behind the slave cylinder or something? Any help is appreciated as I hate to keep replacing slave cylinders and down time. I work nights so it will be late when i can respond. Thanks

 

[SenorNoob]

This is a new one for me. But, logically something is the wrong part. Either the slave, the clutch kit, or the flywheel. I guess if the flywheel had been resurfaced enough it could be too thin. I don't remember there being a spacer between the flywheel and crankshaft but if one were mission that could do it too.

 

[lil_Blue_Ford]

I will say that parts quality isn’t what it used to be. I’ve done the slave cylinder in my F-150 like 6 times now. I’ve lost count. That’s much less fun than doing it in a Ranger, the transmission is much bigger and heavier. Well, the original trans wasn’t too bad over a Ranger, but I upgraded the transmission in search of a stronger slave cylinder in that. Actually that I was hoping to move to an external slave but alas, only the big block trucks had those.

 

[sgtsandman]

Something isn't right for the slave to be able to over extend. Did the original do that as well? Were other things changed, like the clutch or fly wheel? Is the transmission fully seating against the plate and the engine block?

These may seem like dumb questions be we aren't there to physically see everything. We also don't know your level of knowledge and/or skill. So, all the bases need to be covered and it isn't meant to be personal or judgemental in anyway.

 

[stephenjeep]

This is a new one for me. But, logically something is the wrong part. Either the slave, the clutch kit, or the flywheel. I guess if the flywheel had been resurfaced enough it could be too thin. I don't remember there being a spacer between the flywheel and crankshaft but if one were mission that could do it too.

New flywheel from rock auto. New cluth and pressure plate from rock auto and new pilot bearing. Cluth disc replaced both times. Me and my brother are doing the work. He was a Deisel mechanic for several years. I know not the same but same kinda knoledge.

 

[stephenjeep]

Something isn't right for the slave to be able to over extend. Did the original do that as well? Were other things changed, like the clutch or fly wheel? Is the transmission fully seating against the plate and the engine block?

These may seem like dumb questions be we aren't there to physically see everything. We also don't know your level of knowledge and/or skill. So, all the bases need to be covered and it isn't meant to be personal or judgemental in anyway.

The original lasted about 9 months from autozone. I ask here about a good brand and LUK was recommended. I replaced it and it laseted about 45 days. Replaced it and now its draining the resivor again. New flywheel and cluthc disc.

 

[sgtsandman]

The original lasted about 9 months from autozone. I ask here about a good brand and LUK was recommended. I replaced it and it laseted about 45 days. Replaced it and now its draining the resivor again. New flywheel and cluthc disc.

LUK is generally a good brand to go with. I'm pretty sure that's what is in my truck.

Diesel mechanic. So, he knows a thing or two. This is very odd. Especially for multiple ones to go bad like that. I wonder if there might be some defect in the clutch. There isn't much that can go wrong with a fly wheel and you can only seat a slave cylinder back so far. As long as the transmission is mating to the engine like it should, the only remaining variable is the clutch. Who is the clutch made by and what kind of warranty did it come with?

You say you've replaced the clutch both times as well? Correct?

 

[stephenjeep]

LUK is generally a good brand to go with. I'm pretty sure that's what is in my truck.

Diesel mechanic. So, he knows a thing or two. This is very odd. Especially for multiple ones to go bad like that. I wonder if there might be some defect in the clutch. There isn't much that can go wrong with a fly wheel and you can only seat a slave cylinder back so far. As long as the transmission is mating to the engine like it should, the only remaining variable is the clutch. Who is the clutch made by and what kind of warranty did it come with?

You say you've replaced the clutch both times as well? Correct?

Both were Perfection from rock auto. I may try the LUK brand cluth kit from rock auto unless someone knows better. I've been able to retun most stuff to rock auto. I just hate to keep pulling the trans. Thanks for the reply. No gaps in the mating area. I was woundering if something was supposed to be behind the slave cylinder to make up the space? I don't know as this is the only one I've ever had apart and if it was missing I wouldnt know. I've just noticed the flywheel shims for the ranger on rock auto. I honestly dont remember if mine had them or not. This would make up the diffrence maby? I'll check when i take it out again in a few weeks.

 

[sgtsandman]

Both were Perfection from rock auto. I may try the LUK brand cluth kit from rock auto unless someone knows better. I just hate to keep pulling the trans. Thanks for the reply. No gaps in the mating area. I was woundering if something was supposed to be behind the slave cylinder to make up the space? I don't know as this is the only one I've ever had apart.

I don't remember there being anything behind the slave cylinder on either truck when I changed them. I know nothing about the perfection brand. So, I can't comment on how good or bad they are.

I hear you on the transmission. Them being round on the bottom makes things difficult. I resorted to building a cradle to hold it and one for the transfer case since I still have the original clutch in the 2011. Sooner or later, I'm going to have to drop those things again and I don't want the fight I had the last time when I changed the slave cylinder. On the 1998, I was pulling a blown engine. so I replaced everything while I had the engine out. It was a lot easier that way.

 

[broncc]

I had similar issues before... Do you have the correct master cylinder? Are you using a stock pressure plate? The force to actuate a high-pressure one may be too much.

 

[stephenjeep]

I had similar issues before... Do you have the correct master cylinder? Are you using a stock pressure plate? The force to actuate a high-pressure one may be too mIt

Its the same master cylinder. Pressure plate and all eles came from rock auto just the daily driver selection.