Auto Hub Vacuum Leak
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Senior User
Joined: Jan 2004
Posts: 256
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From: Colorado
Auto Hub Vacuum Leak
Ok. 2000 f250 diesel. Did ball joints and a hub last summer (thanks for the help on the ball joints, guys).
Right hub has vacuum leak. I replaced the hub while doing the joints. It had a new o-ring on it. I have verified the leak is coming from the axle side of the knuckle. I just want to verify what seals the inside of the knuckle. Is it the large pressed on metal seal on the axle? Don't under stand how a rotating seal can seal vacuum, please enlighten me. Any hints on replacing this seal ?(don't know how it could have gotten damaged, did not distort it during the job).
Anyway, I thought I'd ask all for input. And thanks again.
Right hub has vacuum leak. I replaced the hub while doing the joints. It had a new o-ring on it. I have verified the leak is coming from the axle side of the knuckle. I just want to verify what seals the inside of the knuckle. Is it the large pressed on metal seal on the axle? Don't under stand how a rotating seal can seal vacuum, please enlighten me. Any hints on replacing this seal ?(don't know how it could have gotten damaged, did not distort it during the job).
Anyway, I thought I'd ask all for input. And thanks again.
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Senior User
Joined: Jan 2004
Posts: 256
Likes: 7
From: Colorado
Yep. Check and replace hoses thruout for the heck of it. Using the pump, a hand vacuum pump, clamps to isolate, etc. I found it to be a problem only in the hub. I pulled the hub apart, verified the new o-ring was ok, re greased. I cleaned the inside of the knuckle, cleaned out the fitting. Still leaks when I hand pump at the hub. Pretty sure the only thing sealing the back of the knuckle is the metal axle seal, just wanted some feedback to reinforce my findings before I go visit the Ford parts guys.
Thanks
Bob
Thanks
Bob
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Joined: Jul 2005
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From: Lake Worth, Fla.
YZ250 I like that so much. I put it in my favorites. I just hope I can find a full day to do a maintenance. I have been told that the hubs are non-serviceable and non-re-buildable. I guess it was a good night to be on truck enthusiast, very useful information.
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From: Concord NC
Originally Posted by G BOBKA
YZ250 I like that so much. I put it in my favorites. I just hope I can find a full day to do a maintenance. I have been told that the hubs are non-serviceable and non-re-buildable. I guess it was a good night to be on truck enthusiast, very useful information.
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Senior User
Joined: Jan 2004
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From: Colorado
Thanks for the effort, but still not the right area. This is what I need-
I really appreciate the efforts. I am pretty sure that's the seal I need, but it's pricey so just want to be sure.
Thanks again.
I really appreciate the efforts. I am pretty sure that's the seal I need, but it's pricey so just want to be sure.
Thanks again.
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Joined: Nov 2007
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that large seal is what seals the back side of the knuckle so if the yellow o-ring is not the problem of the leak then it is the large seal,yeah it's a **** poor design but it is what it is, no wonder the auto hubs are so problematic.
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look at this... http://www.angelfire.com/fang/mercury/ball.pdf
you will see the seal when i pull the axle shaft out... I put that seal on there with 3 C clamps.
The seal DOES make an air tight seal even though it spins cause the inside spins and the outside does not.
I got rid of my auto hubs cause they were junk. But the seal on the back side also protects against mud and junk so if yours is bad i say replace it
ask me any questions i had the front of my truck apart quite a bit
kenny
you will see the seal when i pull the axle shaft out... I put that seal on there with 3 C clamps.
The seal DOES make an air tight seal even though it spins cause the inside spins and the outside does not.
I got rid of my auto hubs cause they were junk. But the seal on the back side also protects against mud and junk so if yours is bad i say replace it
ask me any questions i had the front of my truck apart quite a bit
kenny
