Possible slave cure ???
#1
Possible slave cure ???
After responding to this thread
https://www.ranger-forums.com/forum2...hing-dumb.html
It got me to thinking that maybe this has something to do with the short lifespan of many of our slave cylinders.
If the master cylinder reservoir is filled , and the rubber cup inside it is also filled by mistake , Add in the heat generated from the engine/weather ,The fluid will expand.
Since the rubber cup is also full , thereby eliminating any air needed for expansion , the fluid has to expand somewhere.
Toward the slave cylinder.
Not knowing the actual clearance between the throwout bearing face and the fingers on the pressure plate , lets assume it's .002 inch.(the bearing face should not be contacting the pressure plate when the clutch is not depressed.)
If the fluid heats , say 20 degrees, and expands, it may be enough to let the throwout bearing lightly ride on the pressure plate fingers.
With the bearing spinning constantly , it may generate heat to further warm the fluid in the slave making it expand farther.
Over time the bearing seal wears out due to the constant spinning.
In summary, when checking the fluid level in the clutch master cylinder,be sure to remove the rubber cup and make sure it is empty before replacing it.
https://www.ranger-forums.com/forum2...hing-dumb.html
It got me to thinking that maybe this has something to do with the short lifespan of many of our slave cylinders.
If the master cylinder reservoir is filled , and the rubber cup inside it is also filled by mistake , Add in the heat generated from the engine/weather ,The fluid will expand.
Since the rubber cup is also full , thereby eliminating any air needed for expansion , the fluid has to expand somewhere.
Toward the slave cylinder.
Not knowing the actual clearance between the throwout bearing face and the fingers on the pressure plate , lets assume it's .002 inch.(the bearing face should not be contacting the pressure plate when the clutch is not depressed.)
If the fluid heats , say 20 degrees, and expands, it may be enough to let the throwout bearing lightly ride on the pressure plate fingers.
With the bearing spinning constantly , it may generate heat to further warm the fluid in the slave making it expand farther.
Over time the bearing seal wears out due to the constant spinning.
In summary, when checking the fluid level in the clutch master cylinder,be sure to remove the rubber cup and make sure it is empty before replacing it.
#2
After responding to this thread
https://www.ranger-forums.com/forum2...hing-dumb.html
It got me to thinking that maybe this has something to do with the short lifespan of many of our slave cylinders.
If the master cylinder reservoir is filled , and the rubber cup inside it is also filled by mistake , Add in the heat generated from the engine/weather ,The fluid will expand.
Since the rubber cup is also full , thereby eliminating any air needed for expansion , the fluid has to expand somewhere.
Toward the slave cylinder.
Not knowing the actual clearance between the throwout bearing face and the fingers on the pressure plate , lets assume it's .002 inch.(the bearing face should not be contacting the pressure plate when the clutch is not depressed.)
If the fluid heats , say 20 degrees, and expands, it may be enough to let the throwout bearing lightly ride on the pressure plate fingers.
With the bearing spinning constantly , it may generate heat to further warm the fluid in the slave making it expand farther.
Over time the bearing seal wears out due to the constant spinning.
In summary, when checking the fluid level in the clutch master cylinder,be sure to remove the rubber cup and make sure it is empty before replacing it.
https://www.ranger-forums.com/forum2...hing-dumb.html
It got me to thinking that maybe this has something to do with the short lifespan of many of our slave cylinders.
If the master cylinder reservoir is filled , and the rubber cup inside it is also filled by mistake , Add in the heat generated from the engine/weather ,The fluid will expand.
Since the rubber cup is also full , thereby eliminating any air needed for expansion , the fluid has to expand somewhere.
Toward the slave cylinder.
Not knowing the actual clearance between the throwout bearing face and the fingers on the pressure plate , lets assume it's .002 inch.(the bearing face should not be contacting the pressure plate when the clutch is not depressed.)
If the fluid heats , say 20 degrees, and expands, it may be enough to let the throwout bearing lightly ride on the pressure plate fingers.
With the bearing spinning constantly , it may generate heat to further warm the fluid in the slave making it expand farther.
Over time the bearing seal wears out due to the constant spinning.
In summary, when checking the fluid level in the clutch master cylinder,be sure to remove the rubber cup and make sure it is empty before replacing it.
#3
Different brake fluids expand at different rates at a different temperature. That's why you use dot4 in sportbikes, the heat generated is enough to boil dot3.
Of course, having a more heat resistant fluid would not make it any less susceptible to clearance issues as it would still expand and if it was overfull, contact the pressure plate...
Its an interesting theory I would like to see what the ex ford engineer that drags his ranger thinks. Can't remember his name though.
Of course, having a more heat resistant fluid would not make it any less susceptible to clearance issues as it would still expand and if it was overfull, contact the pressure plate...
Its an interesting theory I would like to see what the ex ford engineer that drags his ranger thinks. Can't remember his name though.
#4
#6
Mine has the vent, I just went and looked. It's a small hole right through the top of the cap, maybe 1/16".
I thought that was the theory - the volume above the diaphragm might be incorrectly filled with fluid and have nowhere to go except to the slave. A vented cap should take care of that.
I thought that was the theory - the volume above the diaphragm might be incorrectly filled with fluid and have nowhere to go except to the slave. A vented cap should take care of that.
#8
Honestly, I think the stock plastic slave is just not up to the job. Simple as that. There are quality hipo/racing concentric slaves available but I have never seen one for a Ford truck application. My feeling is that the aftermarket is missing out bigtime on this one. I would be willing to pay $200 or more for a quality replacement that I could trust to get me home. As far as I know, that option doesn't exist.
#9
#10
#11
Personally, I have totally given up on Ford's internal slave. It is the entire reason that my truck got an automatic when I did the V8 swap. Actually, right now today, I'm in the middle of modding a M5ODR2 (F-series) transmisson to accept an external slave. I want a stick again but it has to be more reliable than before. Or, if not totally reliable, at least easily repairable if the slave does fail.
#12
It will wear the bearing. There is no seal being rotated on these slaves. The bearing itself is a separate piece, and can be changed independent of the slave, though the slave usually goes out before the bearing. You theory, while showing critical thinking and creativity, has a few flaws. The vented cap, which will vent fluid as well as air. The expansion rate of brake fluid, even dot 3 fluid has very little expansion over a 50 degree range, much less 20. And the bearing contacting the pressure plate will wear the bearing, not the slave itself.
I'm with Bob, I think it's the cheap plastic construction, that over time deforms, losing is sealing surface integrity, and thereby losing pushing force.
I'm with Bob, I think it's the cheap plastic construction, that over time deforms, losing is sealing surface integrity, and thereby losing pushing force.
#13
#14
Key words there are SHOULD HAVE but they haven't done a damn thing about it.Yeah its only a $40 or $60 part but you have to pull the tranny to do it and some of us don't have the time, space or tools to do it so I have to pay someone to do it every time.
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lifted97ranger
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01-17-2014 10:38 PM