Clutch question

[77wagon]

I have fixed some problems and found some new ones. The latest issue is that when the clutch pedal is up, I can feel and hear load being applied to the clutch. The rpms drop a little, and I can hear and feel a slight engagement (not slipping)

I have replaced:
Clutch master, slave, and hard & soft lines and adjusted the pedal and slave rod repeatedly

My slave cylinder is not leaking, but was given to me with the truck. Not sure that it's OEM or how old it is. Someone posted that they could fail without leaking. I pulled the boot to check for fluid- none.

Just thought I would check if anyone had any suggestions before I replace the clutch.

Thanks for all advice

PS. Thanks for all those who read and responded to previous posts: I finally found the intake leak, replaced the manifold gasket and it is running great. I think the stalling at stops was greatly affected by the slightly engaged clutch also.

 

[73lndcrsr]

Before replacing the clutch, I would check the slave cylinder rod adjustment again. It really sounds like it is engaged slightly. You should have a small amount of gap between the rod and the fork.

 

[77wagon]

I have tried three differnt times- many differnt ways each time. Tried the manual way, and all other combinations just for experimentation. I have continually hoped that would do it. But it doesn't seem to.

 

[73lndcrsr]

Have you pulled the inspection cover to verify nothing in there? Like mud...

 

[77wagon]

Yeah, it's clean. I was checking it every time I adjusted everything. Monitorng the gap. But never got a chance to watch while someone pushed the pedal- used a piece of wood to prop the pedal.

 

[73lndcrsr]

Sorry, I am at a loss now. Hopefully someone else will chime in.

 

[77wagon]

Thank you 73lndcrsr for the input. I think I may try an OEM slave cylinder in a last ditch effort. If it works I will have saved a lot of money. If not I can at least completely rule it out.

 

[DougAustinTx]

Not sure how you could not know if the slave is right or not.... Crawl under the truck and adjust the length of the pushrod between the slave and the throw-out bearing arm. Does your pushrod have the spring on it that pulls the rod back? With no pressure on the clutch pedal, you should be able to push the rod toward the clutch and feel and hear the throwout bearing touch the fingers of the pressure plate. If it moved even a quarter inch before touching, that is good enough. That tells you that you have enough clearance at the slave. Now, we are assuming that the slave piston is fully retracted, because all you did was push the ROD forward for the clearance test. If the slave piston isn't fully retracted, you need to figure out why. Verify the slave actuates when the pedal is depressed, and retracts fully when the pedal is released. If it doesn't retract, then possibly something is holding pressure in the line after you release the pedal. That flexible pressure line that goes down to the slave can develop a loose flap internally that acts like a one-way valve. It happens on brake lines fairly often. You can check to see if there is pressure on the slave by loosening the flexible line where it meets the hardline. Watch to see if the slave piston retracts when you open the line. When you are done, go back under the truck and see if you still have the clearance by manually pushing the rod forward again.