my clutch starts to slip after only 20 min. or so. as I drive the peddle gets stiffer and then starts to slip. and on a colder day it take longer to start sliping. I have changed my master,slave. I have a new clutch put dont want to put it in till I figure this out. the clutch in there is fine thow. any suggestion

 

its not adjusted properly

 

you mean the adjustment under the clutch pedel in the car

 

I am assuming you purchased a new clutch for a reason so why not put it in and adjust it properly????? Problem solved.

 

just wanted to make sure what the problem might be befor I put a new clutch in and fry it.

 

Sounds like your clutch pedal linkage (under the dash) is too tight, as Mattback said. I will venture to guess that your clutch pedal has zero play. Am I right? Let me explain...

What is probably happening is that the pressure in the clutch line is never completely released, because the pedal linkage is always pushing in on the master cylinder. This will hold the clutch in a semi-engaged position. Being semi engaged (and probably slipping minutely) will cause it to over heat and become slippery. The 20 minutes part is what tells me that it is heat build up that is causing this. This is also very bad for your throw out bearing. Shorten the rod connecting the master cylinder and pedal. You may also have to adjust the bumper that the pedal rests against normally.

 

Did you put clutch in yourself? If so...there is a metal pin that holds the throwout bearing onto the fork comming from the slave cylinder...if it is not tourned the right way it will make the clutch slip when it heats up..the pin looks like it can go either way, but it needs to be turned so that the two bumps on the pin are under the two pieces that go to it on the fork..its very easy to miss...just a suggestion.

 

thanks for all the help I will take a look at it. And yes I a friend did the clutch for me.

thanks again for the help.