[BigRedFJ40]

This is going to sound F'd but I have a strange issue going on with my clutch. I just replaced my clutch about a month ago and ever since then, my pedal is acting strange. When the truck is parked and running in neutral, my pedal is perfect..... If I am driving down the road and go to shift, the pedal is on the floor and has almost no pressure. As soon as you stop it has full pressure again.
Did I get a bad or defective pressure plate????? Everything is new right from Toyota..... I am getting really pissed and getting to the point that I don't even drive my junk......she spends most of her time in my shop looking out the window

 

[orangefj45]

afaik there is no affiliation between engine/vehicle speed and clutch pressure, and i've worked in the transmission industry for 10 years.
it does sound like an interesting/puzzeling problem.
is there any fluid leakage anywhere? what engine/transmission setup is in the vehicle? why was the clutch replaced? was the flywheel ground? if so, how much? i see that you bought the parts from toyota. new or reman? what all did you buy? try to give as much detail as possible.

 

[BigRedFJ40]

Thanks Georg,
Clutch was replaced due to a couple of seasons of abuse in the rocks..... The current setup is as follows:Hotrod 2F, H41, stock 3 speed case, 4:11's and 36" SX's.....

Replaced were the disc, pressure plate, pilot bearing, throwout bearing and the fly wheel was resurfaced...how much I don't know. I do know that it was the 1st time the flywheel was resurfaced.

The disc and pressure plate are both reman. from Toyota..... I don't see any leakage anywhere.......

?????????????????

Chris

 

[mantis]

I had a similar problem... my clutch would work fine for a while, but sitting in traffic would totally kill all pressure. I replaced the slave first, but it still acted funny. I never lost any fluid. My fix was to replace the master. Once I did that all was well.

Good-luck.

 

[BigRedFJ40]

thats kind of where I was thinking too......

 

[orangefj45]

i assume that these symptoms were not present before the clutch assy was changed, so logic dictates that i'd have to be part of the clutch that's causing the problem. but i can't come up with a good reason why?! just as stumped as you are.
have you checked the endplay in the engine. i.e. is the crank walking back and forth? have somebody start the rig and then push in on the clutch while you're watching the crank pulley for any fore-aft movement. just make sure you don't get your ass run over. :flipoff2:
also, try driving it down the road with light pressure on the clutch pedal and see when it starts to loose pressure.
try bringing up the engine rpms while sitting still with light pressure on the clutch pedal while in neutral and see if you loose pressure.
is the hydraulic clutch hose/line close to the exhaust at any point? if so, the fluid might be boiling.
make sure the clutch slave is mounted well and tight to the firewall. also, inspect the mastr inside the firewall for possible leaks. pull the rubber boot back to check. you should not find any fluid whatsoever.
these are the few things to check for which i was able to come up with after talking to a friend of mine whom i'd call an expert trans builder of 20+ years experience.
now i'm more than curious as to what's wrong with it. if we can't figure it out, i'll talk to my friend at LUK (biggest clutch manufacturer in the world). he works in their tech department and knows his shait.
hmmmmm, the mind is racing but not going anywhere. but it will.

 

[BigRedFJ40]

Thanks Georg!!! I will cheek the crank for play tomorrow and also will check the pressure at high idle and while driving and I'll get back to you....

Thanks again!!!!

Chris

 

[orangefj45]

make sure the engine's not runnig when you "cheek" the crank; that might hurt! :flipoff2:

 

[Bagsmo]

If thats anything like "fingering" your pressure plate to check for T/O bearing smoothness, I wouldn't recommend it. I'm still cleaning blood off the driveway. And I'm NOT posting any pictures...

 

[BigRedFJ40]

If thats anything like "fingering" your pressure plate to check for T/O bearing smoothness, I wouldn't recommend it. I'm still cleaning blood off the driveway. And I'm NOT posting any pictures...

That HAD to HURT!!!!! :shaking:

 

[BigRedFJ40]

make sure the engine's not runnig when you "cheek" the crank; that might hurt! :flipoff2:

Sorry Georg, I guess my fingers are moving faster than my brain.. :flipoff2:

 

[orangefj45]

If thats anything like "fingering" your pressure plate to check for T/O bearing smoothness, I wouldn't recommend it. I'm still cleaning blood off the driveway. And I'm NOT posting any pictures...

"fingering", "check for smoothness", "blood", "not posting any pics"?!
ray, you're lucky that i have a lot of respect for you and consider you a good friend, or i'd be getting all kinds of milage out of that statement! :flipoff2:

 

[4x4Poet]

Once you have checked for leaks and found none, bleed the sys again. That is your most likely culprit with an otherwise serviceable setup. Sorry if this is too obvious. I just went thru a bleeding nightmare from mismatched custom parts. :mad3:

 

[70Cruzer]

I also think it needs bleed thoroughly or there is a master/slave problem. Mine did the same thing a few years back and I was thinking along the lines of georg, but it turned out to be the clutch master.