Wasted Throwout Bearings
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New User
Joined: Jul 2003
Posts: 21
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Wasted Throwout Bearings
Got a '99 F-250 with 277k, 7.3ps and 6spd. Had no clutch problems until about 200k. Throwout bearing wore out and took clutch with it. Replaced throwout bearing, pilot bearing and clutch. It worked great until about 1yr(25k) later it did the same thing. Got a new clutch set under warranty and did the deed. Now about 25k later it's about to do the same thing. What is the deal? Please help!
Thanks in advance
Thanks in advance
Posting Guru
Joined: Aug 2008
Posts: 1,845
Likes: 1
From: No.Va.
Is the release fork bent,pivot worn out?
Make sure when you are off the clutch,that there is "freeplay" in the linkage. I realize it is hydraulic,but there stilll should be freeplay between the fork and the clutch.
( I gotta throw this out there-any one riding the clutch?)
Make sure when you are off the clutch,that there is "freeplay" in the linkage. I realize it is hydraulic,but there stilll should be freeplay between the fork and the clutch.
( I gotta throw this out there-any one riding the clutch?)
Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
What brand parts are you using? I don't see where you replaced the pressure plate in your list. My factory clutch started to slip around 212k. I'm at 298 now with no clutch issues on the replacement.
I'd closely inspect the throw out and see if you can figure out why the failure is occuring if it's not a bent fork. Have you ever changed the hydraulics? I'd inspect the rod on the slave cylinder and make sure it hasn't popped loose out of the cylinder.
I'd closely inspect the throw out and see if you can figure out why the failure is occuring if it's not a bent fork. Have you ever changed the hydraulics? I'd inspect the rod on the slave cylinder and make sure it hasn't popped loose out of the cylinder.
Senior User
Joined: Mar 2008
Posts: 342
Likes: 1
From: Maple Ridge, Canada
The clutch is an SAC [ self adjusting clutch ] which ironically needs to be adjusted before install.
The release bearing is in constant contact with the tines of the diaphram spring. There is no means of manually adjusting out free play. ie: adjustable pedal push rod.
The pressure plate has a self adjusting ring situated under the pivot point of the main diaphram spring. The ring has ramps built in and is initially preset [ by installer] to its lowest point. As wear occures the self adjusting ring rotates back from the preset driving, the wedges more under the diaphram pivot point. This makes it so you never have to manually adjust out free play introduced by normal disc wear. The pivot point of the diaphram spring is raised keeping all things adjusted normal. Failure to preset the self adjust ring will result in dramatically shortened clutch life.
Your post is lacking in clear symptom descriptions but this is where it leads me. Good luck
The release bearing is in constant contact with the tines of the diaphram spring. There is no means of manually adjusting out free play. ie: adjustable pedal push rod.
The pressure plate has a self adjusting ring situated under the pivot point of the main diaphram spring. The ring has ramps built in and is initially preset [ by installer] to its lowest point. As wear occures the self adjusting ring rotates back from the preset driving, the wedges more under the diaphram pivot point. This makes it so you never have to manually adjust out free play introduced by normal disc wear. The pivot point of the diaphram spring is raised keeping all things adjusted normal. Failure to preset the self adjust ring will result in dramatically shortened clutch life.
Your post is lacking in clear symptom descriptions but this is where it leads me. Good luck
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New User
Joined: Jul 2003
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So it's not set to the lowest point when it comes out of the box? This may be the problem. I never adjusted anything on either install. The clutch seems to work fine right up until the throwout bearing lets go and kills the pressure plate.
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Senior User
Joined: Mar 2008
Posts: 342
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From: Maple Ridge, Canada
I recently did my clutch and had to set tension on the ring. The last time I did a clutch was on a 90 f250 and before that my 78 mustang and never had to set anything. Even the machine shop that resurfaced the flywheel didn't know what I was refering to about the adjustment. So instead of having him do what he didn't know. I improvised at home.
You need to set the pressure plate on the flywheel in a press and push the tines down to release friction on the ring. Then get another pair of hands and screw driver and adjust the ring. Compressing the wee little springs. I supported the pressure plate on some wood spacers and used the old throw out bearing to push the tines down with my bottle jack wedged up against the rear diff housing.
You need to set the pressure plate on the flywheel in a press and push the tines down to release friction on the ring. Then get another pair of hands and screw driver and adjust the ring. Compressing the wee little springs. I supported the pressure plate on some wood spacers and used the old throw out bearing to push the tines down with my bottle jack wedged up against the rear diff housing.
