ESOF hub vacuum leak parts list - Ford Powerstroke Diesel Forum
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Old 12-06-2012, 11:27 AM
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ESOF hub vacuum leak parts list

My vents were only blowing out the defrost and the vacuum pump on my 2006 F-250 was running constantly. I've traced the vacuum leak to the front hub on the passenger side. For now I've just plugged the vacuum hose that goes to the hubs and manually switch the hub-lock dial to lock or unlock the hubs.

I haven't checked to see if this actually works, but I'm assuming the work much like a manually locking hub if I switch the dial to LOCK and use the dash switch to engage 4wd, then switch the dial back to AUTO when I no longer need the 4wd.

I am planning to fix the hub in question sometime soon and was wondering if anyone had any part numbers for which O-rings I will need. I have downloaded the ESOF.pdf from a thread on this forum.

automatic hubs dont work

It lists part numbers for all the tools needed to test the vacuum, but I didn't see any part numbers for the O-rings. I have found quite a bit of information for the 2004 and older, but haven't found what I need for my 2006. I live 25 miles from town and would like to have everything I need with me before I start the procedure, so any help or advice would be appreciated.

Thanks,
Tony
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Old 12-06-2012, 11:55 AM
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that PDF looks like it's for the 05 -

the newer ones use a different inner seal and a different set of tools for some procedures

I would try the yellow oring first before you go for the expensive inner knuckle seal

also swap hubs and see if the issue follows the hub itself
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Old 12-06-2012, 12:12 PM
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locking hub seals Kit part number 5C3Z-1K106-AB.

then u need the large yellow o ring and a inner seal .. I am sure Sunrise ford on here can get you set up
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Old 12-06-2012, 01:07 PM
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OK, I thought the cutoff was 2004, but you are saying the 2006 is different than the 2005. I cannot find much information about replacing the O-rings in the 2006, but there is piles of information about the pro-2006 hubs. Is the procedure about the same? Is the part number for the Yellow O-ring the same for pre-2006 and 2006?
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Old 12-06-2012, 01:31 PM
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i don't know the exact cutoff but I looked at the pdf and it had the snap ring on the actual hub unlike ours

I do believe the o ring is the same

u can make the installer like you do for the older ones just use 2 inch pipe

and you's likley have to try a few types of snap ring pliers but it's easy to pull the outer hub and if you pliers don't work just stick it back on untill you find one that does work
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Old 12-06-2012, 01:34 PM
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I would swap hubs first three screws and pull this will save you some time if it's just a bad hub ,

next if the hub passes the large o ring is easy to replace IIRC the last is the big inner knuckle seal ,, but thats what mine was , if you really get motivated u can update the axle dust seal to the new one that goes in the axle tube
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Old 12-06-2012, 01:53 PM
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Great info. Thanks alot ZMANN!

I just didn't want to start taking it apart and not have new O-rings to put back in and have it apart outside until I could get the parts. But if I can at least check the hub-lock portion alone without having to replace anything then I might tackle that this weekend.
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