2nd Gen Non-Engine/Transmission Clutch Master Cylinder, HELP!

[Augustus]

In two years I have replaced the hydraulic assembly for the clutch 3 times, now that I am on the fourth one it seems to be going out again. Small signs are telling me the it is going to blow any moment. The master cylinder is starting to squeak and it is hard to get into gear sometimes. I have no idea why this is happening? The dealership just keeps giving me new ones at no cost because of the one year warranty on parts. But something has to be causing this. Otherposts have said to:



check that the diaphragm spring on the pressure plate is not distorted or weakened, and that the pivot ball on the passenger side is not worn out. Also check the clutch fork for wear. "



How do I check the the diaphragm spring on the pressure plate and the clutch fork, just unbolt the bell housing?



Any other ideas?

 

[Augustus]

TTT

 

[QRTRHRS]

Your talking master but,

Don't know if changing the slave would help you or not. DC sells it as a complete unit but you can get the slave or master from NAPA. Seeing you have a 99', maybe this would help?

https://www.turbodieselregister.com/forums/showthread.php?s=&threadid=17829&highlight=Slave+cylinder

 

[Motorhead]

If your clutch cover is warped, the clutch usually will chatter on engagement. Another way to ck for P. plate warp is idle the truck in neutral and slowly depress the clutch to just contact the T. O. brng to the p. plate. You will feel a chatter in the pedel. When the system is working, is the pedel hard? The T. Out bearing can get sticky on the guide cover on the trans input shaft. This could be putting extra strain on the hyd system as it has to put more pressure on the binding TO brng to dis engage the clutch.

My $. 02 Chris

 

[South Bend Clutch]

Very perceptive Motorhead! A diaphram clutch being a multi-finger and with hydraulics, the bearing rides continuously on the fingers of the pressure plate. If the fingers are not all perfectly level then as the pressure plate turns the high spot will pulsate the throwout bearing continuously pushing the throwout bearing back and forth with every revolution of the pressure plate will directly push the rod of the slave cylinder in and out continuously while the truck is running. This will therefore wear the slave cylinder out very quickly. Motorhead had the proper way of checking by slightly putting pressure on the clutch pedal with your hand to see if you can feel this pulsation. Also, if there is a bad master cylinder or restriction in the line, it could build pressure and cause the slave cylinder to blow the seals rapidly as well. If you ever do hydraulics it is best to replace the master and the slave at the same time, if you do not get the line between the two then make sure it is clear of debree and kinks. Also if the fork is worn to one side or has a manufacturer defect, it will also want to depress at an angle and create a higher load on the hydraulics then it is rated for thus causing the same problem.



Good luck



Peter