More clutch help

[Tom Welsch]

I posted another thread and you helpfull fellas gave me some things to check but sadly nothin worked. the clutch on my truck is being funky. Nothing is leaking and fluid is topped right up. When you push the clutch to the floor it feel normal, put it in gear and after a second or two the clutch disengages slowly and the truck takes off, all while your foot is to the floor with the clutch. Any help is appreciated.

 

[fest3er]

That sure sounds like fluid is leaking past the piston, much the same as when a brake pedal slowly goes to the floor.

 

[GCroyle]

If you're a bit handy you can A. Test the hydros independent of the clutch for air or B. Burp the system and SEE if air comes out. C. Inspect the system for weeping, behind SC dust boot or behind start switch on master cyl. (MC) are the hot spots to check.

Test. Remove slave cyl (SC) from bell housing. DO NOT PUSH PEDAL remove push rod and dust boot from SC. Now attach a small steering wheel puller across from of SC. Turn screw in until contacts piston, then turn in about 1" more. Secure SC under cab somehow. Evaluation. Use you fingers to push clutch pedal but what you MUST watch for is how far the push rod travels before you feel hyd pressure being created. 1/8" or even less is good, more is bad indicated AIR. These systems create PSI almost immediately.

Bubble visual test. Remove ENTIRE hydros as ONE piece. Take to work bench if available. Position MC in vice push rod end pointed about 30-45 degrees below horizontal. If you don't point it down the test will not be valid. Now two people one watches reservoir cap off and look for bubbles, other guy points SC straight down and push down slowly compressing SC sending fluid and AIR up. Fluid level will rise up and bubbles should burst as they are pushed out. You can leave puller attached and re-evaluate system as you burp.

Now these are tests that will evaluate but these tests will not fix a worn out system.

This guy demos this procedure for burping and eval.

Gary

 

[Joe Mc]

Sounds like an internal leak-by at either slave or m-cylinders or both. If it were me I'd get a new pre-bled and swap out.
https://www.southbendclutch.com/clutches/Hydx1.50-10166/