Clutch Help/Advice needed
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Clutch Help/Advice needed
Sorry this is long.
I just replaced the DMF less than 500 miles ago. I replaced it because the pedal got so high after a highway trip that I had to bend the stop bracket a bit to keep the clutch engaged. When I dropped the inspection cover I noticed the disc did not look too worn but thought the DMF might be the cause of the problem so I opted to replace it.
Put in all new SMF LUK components.
New clutch was working and feeling great. I noticed the pedal slowly getting higher but figured that could be due to air in the system. I took a trip down the highway and the pedal got higher, returned home and it is really high to engage. Never felt or heard any slipping although I did hit 80mph a couple of times with wide open throttle.
It does not slip at all. I dumped the clutch in 5th with some RPMS and it grabs immediately.
What is happening to my clutch? If it is slipping at high speed and i can't hear it, why? It is a brand new setup.
Can I save it?
I just replaced the DMF less than 500 miles ago. I replaced it because the pedal got so high after a highway trip that I had to bend the stop bracket a bit to keep the clutch engaged. When I dropped the inspection cover I noticed the disc did not look too worn but thought the DMF might be the cause of the problem so I opted to replace it.
Put in all new SMF LUK components.
New clutch was working and feeling great. I noticed the pedal slowly getting higher but figured that could be due to air in the system. I took a trip down the highway and the pedal got higher, returned home and it is really high to engage. Never felt or heard any slipping although I did hit 80mph a couple of times with wide open throttle.
It does not slip at all. I dumped the clutch in 5th with some RPMS and it grabs immediately.
What is happening to my clutch? If it is slipping at high speed and i can't hear it, why? It is a brand new setup.
Can I save it?
Post Fiend
Joined: Jan 2005
Posts: 8,402
Likes: 10
My guesses would be bad pipe between master cyl and slave cyl or bad master cylinder.
You could also look under the dash and see if the rod from the pedal to the master cyl is the adjustable one, if so you could try to adjust it shorter.
You could also look under the dash and see if the rod from the pedal to the master cyl is the adjustable one, if so you could try to adjust it shorter.
Moderator
Joined: Jan 2001
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From: Virginia
The higher the better is my opinion. I just installed my clutch master cylinder, and it's not adjustable(1989). You must be getting more air out of the system and that's making the pedal activation higher.
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I had not thought about a possible bad master, What could it be doing that would cause the pedal to engage so high?
Right now if it gets any higher it will hit the stop for the pedal before it can fully engage and then it will start slipping.
Right now if it gets any higher it will hit the stop for the pedal before it can fully engage and then it will start slipping.
Lead Driver
Joined: Dec 2006
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From: So. Jersey
If the rod is out of adjustment it wont release the piston back far enough to dump the pressure so everytime you hit the pedal it keeps some of the pressure on the throw out bearing giving you no air gap or insuffeccient release. Make sure you have pedal freeplay.
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I don't have any free play, that is the problem. They system is hydraulic so there is no adjustment. I am losing my slack/ free play in only 500 miles.
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Elder User
Joined: Mar 2008
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From: Marianna, Florida USA
It sounds like you lost the free play between the actuation rod and the master cylinder. It's acting like you are pumping the brakes. It can't release the pressure back into the reservoir and fluid accumulates in the master cylinder. This causes the loss in pedal free play.
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Elder User
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From: Marianna, Florida USA
You nailed it crewdually. Sorry I duplicated your answer.
Moderator
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From: Virginia
If there is a free play adjustment on these hydraulic clutch systems, someone tell me were it is, because I can't see it. The only way I know of would be to put shims between the clutch master and the firewall.
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I heard you can purchase an adjustable push rod but I have not tried.
I am pulling the inspection cover tomorrow and checking out the clutch fork as well. I may end up adjusting the fork a bit.
I was thinking that maybe it has worn itself into a groove or something.
The truck has 340K miles.
I am pulling the inspection cover tomorrow and checking out the clutch fork as well. I may end up adjusting the fork a bit.
I was thinking that maybe it has worn itself into a groove or something.
The truck has 340K miles.
Post Fiend
Joined: Jan 2005
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As I understand it the adjustable rod was used `91 on. Junk yard would be a good bet to get one.
5th Wheeling
Joined: Jul 2009
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I have one of those adjustable clutch pedal pushrods that I bought for my '88 F-250. I never used it, and I think I paid about $20 for it from the Ford dealer. I sold the truck, and my new one has an automatic. Make me an offer if you want it.
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I don't see an adjustable rod on mine. The clutch master only has a small rod hooking to the pivot arm. Not sure how much adjustment there could possibly be.
What I can't figure out is why in only 500 miles has my pedal moved so far to the top to engage. If my pedal stop wasn't bent it would probably not engage at all.
What I can't figure out is why in only 500 miles has my pedal moved so far to the top to engage. If my pedal stop wasn't bent it would probably not engage at all.
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