Clutch Issue
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Clutch Issue
I have a '96 F350 PSD. I don't have enough Clutch to get it in gear. I have changed both the master and slave cylinders and I've done everything I can to bleed the air out and I think I've got it but I still only have about half peddle. Does anyone else have any ideas? The clutch disks themselves look ok.
Post Fiend
Joined: Oct 2003
Posts: 6,214
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From: New Jersey
Make absolutely sure the top fitting sticking out of the transmission that attaches to the slave cylinder is tight... if it leaks even slightly you get a lot of air into the system and lose pressure (and pedal height) very quickly. If you're not sure if it's leaking, wrap the threads with teflon tape as you would a pipe fitting, reinsert, and bleed again.
When I did the clutch over in my F350 crewcab (351W, 5sp ZF) I had the same issue, and after repeated attempts to bleed the system thinking it was my issue due to incorrect or incomplete bleeding.
For me it turned out to be the brand new slave cylinder - it leaked profusely right out of the box - cheap blue plastic with a spring :eyeroll:
Not sure if the diesel ZF's got the same blue plastic garbage or not, but if you did, that may be what your issue is.
When I did the clutch over in my F350 crewcab (351W, 5sp ZF) I had the same issue, and after repeated attempts to bleed the system thinking it was my issue due to incorrect or incomplete bleeding.
For me it turned out to be the brand new slave cylinder - it leaked profusely right out of the box - cheap blue plastic with a spring :eyeroll:
Not sure if the diesel ZF's got the same blue plastic garbage or not, but if you did, that may be what your issue is.
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leaky slave
Thanks for taking the time to give your input. The diesel slave is a little different and it doesn't seem to leak. It doesn't thread in it just slides in to a washer and is held in place with a pin. I have put preasure to it with a power bleeder and it holds.
Lead Driver
Joined: Oct 2003
Posts: 8,476
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From: Madison, WI
Sounds like you have the ZF tranny with the external slave, then, right? I'm not familiar with these clutches particularly, but generally, if you're not disengaging enough, it's either the hydraulics, or the fingers of the pressure plate. With the external slave, you should be able, with an assistant working the pedal, get _some_ idea of the hydraulics function. You should be able to see how far it pushes the fork. I'm sure there's a reference minimum travel documented somewhere; I'll see if it's in my wife's FSM. But generally, if it looks like the slave is pushing the fork as far as you would expect, then the problem has to be "downstream", thus, a fork problem, or weak pressure plate fingers.
I presume that if you start it in gear, clutch down, and rev it up while holding the clutch, it'll still creep a bit, right?
I presume that if you start it in gear, clutch down, and rev it up while holding the clutch, it'll still creep a bit, right?
Post Fiend
Joined: Oct 2003
Posts: 6,214
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From: New Jersey
The threads I was talking about was for the bleeder valve that's removable from the slave... mine leaked a little bit from there, not enough to allow fluid out but enough to allow air in.
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Ok thanks, I will try that. I've got a friend going to look at it with me on Monday.
