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Old 04-01-2010, 01:08 PM
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Rear Axle Seals

I've just looked through the KB and ran across several entries about axle seals and there is some question about having the correct number of seal for the many available axles. I have a leak on one side of my '73 Merc Cougar 9" rear end which is installed in my hot rod. I know it's the big bearing type but I'm concerned about the correct seal. I have attached a recreation of the tag that was on the gear housing. What do these numbers mean and will they help me get the right seal? I know it's a 2.75 gear but are the other numbers anything but where it was made or are they helpful?
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Old 04-01-2010, 01:11 PM
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The best thing to do is remove the old seal and take it with you to the auto parts store. The seal will probably have a number on it somewhere that can be crossed over to the brand of seal that they sell.
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Old 04-01-2010, 02:24 PM
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67-73 cougar with 28 spline axle's uses a 9569S axle seal
67-73 cougar with 31 spline axle's uses a 9363S axle seal

Axle Brg for either is a RW207CCRA

Last edited by prostreet6t9; 04-02-2010 at 01:49 PM.
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Old 04-02-2010, 11:55 AM
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prostreet,
Thanks for the numbers. I would guess that the shafts are 28 spline but I'm not 100% sure. The rear was from an RX7 but the engine isn't there and it's not posi. This was when the Cougars were full size like the TBirds at that time. I cleaned the tag and gave it a coat of paint to better read the numbers. I think the first set is WE(or 8)B. Any way I will check with the local NAPA and see what I can get. I just hate to tear it down and not be able to put it right back together.
Thanks again for your help!
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Old 04-02-2010, 12:35 PM
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If that's the case then it probably has the tapered roller bearings and the external seal. You will have to replace the bearing to replace the seal. Those rear ends had 28 spline axles.
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Old 04-02-2010, 01:38 PM
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In all likelihood, the tag actually reads "WEB-AD", not -4D.

And, yes- it is a 28 spline.
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Old 04-02-2010, 02:02 PM
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Quote:
Originally Posted by big gear head
If that's the case then it probably has the tapered roller bearings and the external seal. You will have to replace the bearing to replace the seal. Those rear ends had 28 spline axles.
Actually the seal's will be in the axle tube. The Brg style with the seal behind the Brg is the A20 Brg with the 3195 seal.
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Old 04-02-2010, 02:09 PM
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Both of those seals have the same OD. So you could also ID the seal by measurement of where the seal rides on the axle.

9569S 1.365 ID
9363S 1.5 ID
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Old 04-02-2010, 02:22 PM
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Quote:
Originally Posted by prostreet6t9
Both of those seals have the same OD. So you could also ID the seal by measurement of where the seal rides on the axle.

9569S 1.365 ID
9363S 1.5 ID
I believe the 1.5" ID seal is for the 31 spline axle, so the National #9569S should be correct for the OP's application.
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Old 04-02-2010, 03:20 PM
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If it does have the tapered roller bearings then do not install the seal in the housing. This will cause the bearing to burn up very quickly. The sealed ball bearing is the only one that uses the seal in the housing. The tapered roller bearing requires oil from the rear end for lube.
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Old 04-02-2010, 04:51 PM
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I've just been to NAPA Prolink's on-line catalog, and came up with:
(NAPA here in Canada at least sells SKF / CR bearings and seals)


Part Number RW207CCRA
Description Wheel Bearing - Sealed Type - Rear Wheel
Attribute Product Features:Ball, Two Rubber Seal, With Lock Collar,Angular Contact for Load Distribution, Sealed To Reduce Maintenance and Increase Bearing Life,I.D.:1.3780",O.D.:2.8346",Width:0.8449",Addit ional Contents:Ball
Comment w/ Locking Ring



Part Number 13700
Description Wheel Seal - Rear Wheel
Attribute Product Features:Spring Loaded, SKF Patented Bi-Directional Wave Seal, Positive Fluid Control, High Quality General Purpose Rubber, Temps From -40 To 121 Deg C,I.D.:1.365",O.D.:2.265",Width:.313"

================================================== =====
That tapered roller brg, with the seal that mounted right up on the bearing didn't arrive on the scene until 1974, IIRC.


Part Number BR20
Description Wheel Bearing - Rear Wheel
Attribute Product Features:Tapered Cup and Cone Set,Ground to Match Set,I.D.:1.5630",O.D.:3.1490",Width:0.7656",Additi onal Contents:Cup & Cone
Comment w/ Roller Bearing
(Front view)

(Back view)
Part Number 18881
Description Wheel Seal - Rear Wheel
Attribute Product Features:Spring Loaded, High Quality General Purpose Rubber, Temps From -40 To 121 Deg C,I.D.:1.875",O.D.:3.146",Width:.93"
Comment w/ Roller Bearing

================================================== =======
According to that same Prolink catalog, though ... both a ball brg (a different one than 1973) and a tapered roller were offered in 1974.


Part Number 88128RB
Description Wheel Bearing - Rear Wheel
Attribute Product Features:Ball, Two Rubber Seals,Extended Inner Ring for Stability,I.D.:1.5312",O.D.:3.1496",Width:1.0830", Additional Contents:Ball



Part Number 15142
Description Wheel Seal - Rear Wheel
Attribute Product Features:Spring Loaded w/ Auxiliary Dirt Lip, Skf Patented Bi-Directional Wave Seal, Positive Fluid Control, High Quality General Purpose Rubber, Temps From -40 To 121 Deg C,I.D.:1.5",O.D.:2.506",Width:.313"
Comment w/ Ball Bearing

Being that I was a Ford Partsman from 1979 to 1993, I can say that Henry drove us all crazy with this crap!

Anyway ... ALL of these bearing styles used a pressed-on
bearing retainer, so have a look in the box to make sure you have a new one.
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Old 04-03-2010, 10:23 AM
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Quote:
Originally Posted by cobalt327
I believe the 1.5" ID seal is for the 31 spline axle, so the National #9569S should be correct for the OP's application.
You're correct. I guess I should specify those are National seal numbers.
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