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Rear axle seal

72K views 31 replies 7 participants last post by  Tom S  
#1 ·
Today i pulled the rear drums to check the brakes and see about adjusting the e-brake. Well wouldn't ya know it, the passenger side axle seal is leaking and all the shoes are cracked.

Ok, I call advanced and they have everything I need. I Go pick up the parts and tear into the passenger side 1st.

Pull the axle bolts, axle, wheel bearing nut and outer bearing. But now the spindle is fighting me. After a lil more pulling i get it off. Well half the seal is on the spindle and the other half in the hub. I manage to get the "wear sleeve" off the spindle and can see why it was on there(the spindle is quite pitted)

Anyway i pull my new seal(national#370047A) out of the box and it is just a 1 piece design(not going to work)

So my question to all of you is, where do I get the 2 piece seal like the one I took off? Advanced cant get the 2 piece one. And does anyone have a write up on how exactly it goes together?

thanks,Brad
 
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#2 ·
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#3 ·
Yeah. I found out that much but there is some lack of certainity on what the correct part # is. I found # 34384 and # 34386. And i still dont know where to get one:confused:
 
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#4 ·
When you get this figured out please take some pictures
 
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#6 ·
SKF-Scotseal catalog shows the number ending in 84 to be correct.
 
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#8 ·
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#10 ·
The 34387 looked like a conventional seal to me.
 
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#14 ·
Anyway i pull my new seal(national#370047A) out of the box and it is just a 1 piece design(not going to work)
Ummmmmm.............

You want the 370047A seal. It's a better seal.

Clean the spindle very good. Put a smear of the Right Stuff on the spindle where the outer edge of seal would go.

370047A seal

Image


Image


Billy T.
gnxtc2@aol.com
 
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#15 ·
Ok. Some pics of the SCOTSEAL As Chicago Rawhide calls them.
It is basicly a 2 piece seal, similar to a roller bearing.

The seal is "pressed" into the hub just like your normal seal, BUT the inner part of the seal that normally rides on the spindle does not spin on the spindle. It just slides on making a tight seal. Then the outer part that is pressed into the hub spins around the part that is sealed to the spindle.

Since my spindle was so pitted and i didnt want to have any further leaks i put a thin layer of RTV on the spindles surface where the seal lays and i also did the same thing on the outside of the seal where it is pressed into the hub.

Enough w the babling ,here are the pics

The bare backing plate
Image

My pitted spindle
Image

Image


the new SCOTSEAL
(bearing side)
Image

Backing plate side
Image


Seal pressed into hub w a little RTV to seal it to the hub
Image

Image


Little bit of RTV on the spindle
Image


I slid the hub onto the spindle by hand and when seal hit the spindle i stopped. I put the outer wheel bearing in, the nut and tightened by hand. This very evenly and gently pushed the tight fitting seal on to the spindle. I spun it a couple of time, torqued(60ft lbs), spun a couple more times checked torque, backed of the recommended amount(8 clicks). spun it some more. backed it off, torqued it again(60ft lbs) then backed off the 8 clicks. Then put the axle in, cleaned and relocktighted the bolts, put then in by hand then torqued to (50ft lbs)

Image


I then assembled the brakes and put the drums back on, tires and checked my axle lube level. It was a lil low but i am not worried, i have new 08 alum diff cover coming tomorrow. So i just went out in my driveway and got sideways on the hill letting the axle lube run to the right side(the seal i just changed) and sat there for a good 30 sec. and let the hub fill with oil. I went for a test drive of about 20 miles.

Came home, jacked the truck back up, pulled the tire and drum, and it is all dry.

hope this is able to help someone else out, in a similar situation
 
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#16 ·
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#18 ·
Just some FYI:

The 370047A seal crosses over to the 34387 seal.

Billy T.
gnxtc2@aol.com
 
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#20 ·
So I am not clear on what is the right seal to get now???
 
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#21 ·
No kidding huh? :doh:

I have a Ford part number for the seal F4TZ 1177 B and it looks very much like the National 370047A.

I know that the Yukon Mighty Seal is part number YMS370047A which leads me to think it is a repackaged National.

Yet several 10.25 axles I have pulled apart have all had the SKF 34387 style seal in them.

I think if your spindle is not worn the National seal is a better replacement. But if the spindle is damaged like the OP's then the SKF would be the way to go. Seems like a toss up either way and they are both close in price.
 
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#22 ·
The ford seal lists for about $140:eek: And apperently that is what my truck had originally and that is what failed.

It is a wear sleeve that goes on the spindle and the the seal is pressed into the hub, but first a "oil slinger" goes against the bearing to keep the oil away from the seal.

I will try and get some pics of the bad seal tomorrow. the bad thing about the ford seal, besides the price is that you need a special tool to drive the wear sleave on to the spindle
 
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#23 ·
Hey man I have been reading the whole thread and I cant seem to find the solution to this? I have recently been deep into my hub. When i bought my truck the rear end was trashed, so i bought a "new to me" rear end and swapped them, ran the truck for 5000 miles and boom drivers side was making some wicked noises. Pull it off and the outer bearing is just roasted. Put it back together and that seal starts to leak. Not a lot but enough to notice.
 
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#29 ·
Brad, your pics aren't there anymore, could you get them back up? thanks.
 
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#30 ·
Ok. Some pics of the SCOTSEAL As Chicago Rawhide calls them.
It is basicly a 2 piece seal, similar to a roller bearing.

The seal is "pressed" into the hub just like your normal seal, BUT the inner part of the seal that normally rides on the spindle does not spin on the spindle. It just slides on making a tight seal. Then the outer part that is pressed into the hub spins around the part that is sealed to the spindle.

Since my spindle was so pitted and i didnt want to have any further leaks i put a thin layer of RTV on the spindles surface where the seal lays and i also did the same thing on the outside of the seal where it is pressed into the hub.

Enough w the babling ,here are the pics

The bare backing plate
Image

My pitted spindle
Image

Image

the new SCOTSEAL
(bearing side)
Image

Backing plate side
Image

Seal pressed into hub w a little RTV to seal it to the hub
Image

Image

Little bit of RTV on the spindle
Image


I slid the hub onto the spindle by hand and when seal hit the spindle i stopped. I put the outer wheel bearing in, the nut and tightened by hand. This very evenly and gently pushed the tight fitting seal on to the spindle. I spun it a couple of time, torqued(60ft lbs), spun a couple more times checked torque, backed of the recommended amount(8 clicks). spun it some more. backed it off, torqued it again(60ft lbs) then backed off the 8 clicks. Then put the axle in, cleaned and relocktighted the bolts, put then in by hand then torqued to (50ft lbs)



I then assembled the brakes and put the drums back on, tires and checked my axle lube level. It was a lil low but i am not worried, i have new 08 alum diff cover coming tomorrow. So i just went out in my driveway and got sideways on the hill letting the axle lube run to the right side(the seal i just changed) and sat there for a good 30 sec. and let the hub fill with oil. I went for a test drive of about 20 miles.

Came home, jacked the truck back up, pulled the tire and drum, and it is all dry.

hope this is able to help someone else out, in a similar situation
 
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#31 ·
thanks, I hadn't seen a spindle that pitted before
 
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#32 ·
Brad wanted this added to this thread as he cannot post in this section. Just a note of caution to anyone reading this thread.

The axle seal I used has failed. I am going to try the 34384 the "87#" is the one that failed.
 
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