Since my other post here( HERE) seems to have run its course I decided to start another one as I think I have it narrowed down.

Ran a MityVac test as suggested on the solenoid
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Key on, vent on, fan on low, ESOF turned to 4x4 Hi ....

Passenger side plugged w/ golf tee and driver side hooked to Mityvac

--Engagement 30" for 40 secs......disengagement 15" at 12 sec

Drivers side plugged w/ golf tee and passenger side hooked to Mityvac

--Engagement 30" for 40 secs......disengagement 15" at 12 sec

Did this twice per side. Seems like solenoid is fine.

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Hooked Mity Vac directly up to driver's side hub that has never been replaced....held 20lbs on two squeezes of Mity Vac

Passenger side hub that was changed a year ago would not hold anything. I am thinking this is the culprit. Would the Ford truck brain trust agree?

If so...besides the main yellow seal, what else do i need to replace?. This is a brand new hub....as of a year ago. And where is the best place to get the seals?

Thanks fellas.....almost got this done..

 

As far as getting the seals I would say Ed but not so much anymore. Local dealer or another online Ford dealer.

You have the autolock hub o-ring, the yellow o-ring and the large knuckle seal.

I had my bearing replaced and they didnt install the yellow one and had the thrust washer in on the wrong side which then ruined my knuckle seal. Wasnt a difficult job. Its hard to say which one is bad without looking first.

 

Sure... I just wanted to make sure I check them all. I don't want to get into it and need something else. Also would like to check prices and if I can buy them cheaper as a kit that would be good as well.

Thanks for the reply.

 

I would replace them all while I was in there. The knuckle seal itself is like 45 bucks from the dealer.

Our Ford parts sponsor had just created a kit that would have all the seals for both sides for like 117 bucks or something like that. But since he no longer has any control of that site I wouldnt order from there. I can give you the part numbers in a few when I find them.

O RING F81Z-4A322-AA (yellow o ring)
O-RING-SNAP RING SET 4C3Z-1K106-AA (autohub o ring)
OIL SEAL-FRT AXLE F81Z-3254-CB (knuckle seal)
Front hub seal, f250 F81Z-1S175-HCA

One of each of the above is what you need to do one side all the way to the knuckle seal. You will need to build/buy/borrow a seal driver to put that knuckle seal on though.

 

Man they hang you by the short and curlies for a little pice of plastic....

Thanks for the part numbers...

 

I thought it was kinda steep too until I got the knuckle seal in. Actually a pretty impressive part for what it is.

 

I'm reading about your homemade seal driver in other threads. Looks like it works for some and others its does not.....I've just seen a pic of it. What does it entail.... parts wise to build...... and cost?

 

I built mine for like 15 bucks from 3 parts at Home Depot. I will post the link I used to build mine in a few minutes. I had never done this and it worked for me the 1st time.

https://www.ford-trucks.com/forums/3...-joints-2.html

Post 36 for details and post 38 for picture! You will need to grind down the flange a litle to make it work like it should.

 

Great thread for future use as well. thanks for the link

I can't seem to find a good place to buy the seals from. Powerstrokeshop has always been a good place for me but they aren't liking those part numbers. I'll keep looking.

 

Silver State Ford Parts Genuine Ford Truck Parts Lincoln Mercury Parts OEM Ford Parts and Accessories

No problem! Good luck!

 

Got it thanks....

 

triskit.....where is this seal located?

Front hub seal, f250 F81Z-1S175-HCA

I know where the yellow seal, the auto hub seals and the axle seal is.....thanks.

 

Its not on the hub itself...its on the inner side of the axleshaft. Ill see if I can find a pic to better explain it.

 

Not the perfect picture but you should get the general idea of where that dust cover is...

 

Wow...sorry...screwed up on that one...

Dont go by that pic. Its late and I cant think straight! I will check mine tomorrow and re-edit that picture....