The Stovebolt Site Forums The Shop Area Driveline Inner Bearing Grease Seal Number for Upgraded Front Roller Bearings

Need a quick check on this guys; I did many, many searches in the forums and found wrong info for my application. Truck is apart, so speed helps.

I bought (about two years ago) the CPP 4759RBK Roller bearing upgrade. Installed it then and haven't had any major issues. But while checking and repacking today, I noticed my inner dust shield on the left side had cut the neoprene part of the inner seal.

Of course, CPP does NOT tell you what the seal numbers are. The seals are blank too, but look like this:

Roller Upgrade Seal

And here's a thread I did a while back on the upgrade (with pictures):

Thread

Scattered all over the forums here, folks throw out National 6064 as the replacement seal number. But that seal does not come close to matching the dimensions of this wheel bearing seal.

Anyone have an interchange number for me for the seals used in these kits?

The CPP kit is meant for a 47-59 Roller Bearing Conversion on a 1/2 ton truck.

Thanks in advance. Want to hit the FLAPS for the seal because Classic Parts ships slower than molasses.

Jim

I've got the 6064 number noted, but also 3656536, dimensions here might try that locally

Bill

Yeah,

Dimensions sometimes look the same, sometimes not, Depends what they mean by bore size, etc...Assume the "shaft diameter" is the inner diameter of the sealing surface, but hard to tell.

The seals look nothing like the ones what came with my kit. But that isn't necessarily a problem if they fit. But I think the inner race of the kit may be a different size than the original ball bearing ones I replaced, which would put this seal in the wrong place.

Only way to tell seems to be to go to the FLAPS, buy one, and test it. The old style felt one sold at my FLAPS matches some dimensions but not all.

Thanks for chiming in Bill. These were the numbers I had seen from dozens of previous posts. If I find a number for the exact type sold with these kits I'll post it here.

Jim

Couldn't you take your seal with you and have NAPA mic it for size and match it to a known seal.

John

With my MBS bearings the felt wouldn't work.

Try this site. Downloads a little slow, but has everything you need.

http://www.timken.com/en-US/products/Documents/Seal-Specification-Guide.pdf

Might just be this part of the country, but my local NAPA doesn't work that way; They need it to match something in the computer or have it be a part they are familiar with. The few times I have brought something in to have them match, no luck. Times are changing.

The other parts stores in my area are worse. NAPA is at least nice about it. I always try to find the oldest guy in the shop. Get lucky some times. Not always.

I tried that guide. Shaft size wasn't a match and for the other dimensions, one or two were off.

That said, I only gave it about 45 minutes before I gave up on it and tried to do it the easy way. That being this thread...

Thanks

Hy Fourbrads, please post the dimensions of the seal you require.

Okay,

The numbers from the seal were as follows (using my own terminology):

Shaft size (The neoprene area that seals against the outside of the inner bearing diameter, which to my surprise was the same as the old bearing) would be: 1.87" I say 'would be' because I can't measure up my cut neoprene, but I am guessing that the charts say 'shaft size' to tell you the diameter of the shaft that the seal is designed to soft seal against.

The outside diameter of the seal body itself, measured where it is not flaring to form the lip of the seal, would be 2.952"

The depth of this seal is about .25", that is, the amount that the seal lip will allow the seal into the hub body. The total width of the seal is about .3"

The total outside diameter of the seal body (measured on the lip that rests on the outside of the hub) is: 3.15"

Looking at the chart, the 6064 comes the closest for sure (but does not have a lip on it). But it's a different kind of seal and sounds like Whitedog tried it before too. I've order one from my FLAPS for scientific purposes. But I think I'll still try to work out an exact fit, as came in the kit, and see what that number ends up being.

Appreciate all the help guys.

Jim

Looking at Rockauto, the Timken is a Rubber lip seal and the National is a Felt seal. I thumbed through the Timken catalog also, doesn't seem to be any that are close to fitting.


http://www.rockauto.com/catalog/moreinfo.php?pk=1118581

Hy Fourbrads, I found a listing for an SKF (C/R) seal p/n 18889, O.D. 3.150", bore or shaft size 1.875", thickness or width .250", hope that helps.

I have to say the fellows down at my local Napa have been in business for many years, they'll still measure something if I don't or can't find the number. They're willing to pull out the books and try and find a match.

John

Jim, is there any bearing distributors in your area that you can go to and have your seal measured up? They would be the bearing and seal professionals that could maybe help you find an answer.

Update:

I received the three different versions of 6064 seals that I found out there. As mentioned by others, the National brand is a felt seal that fits inside the bore of the hub but does not have a lip that bottoms on the rim of the hub.

The two that were marked "Timken" and came in Timken boxes (6064) were metal with a neoprene angled inner seal surface. One had some orange retaining 'glue' on the outside diameter, the other did not. Not a big deal. Both fit exactly as the National one did, though they were somewhat less in thickness.

I found the National seal first, ordering it into my local AdvanceAuto. So I put that on the truck last week while waiting for the correct seals to come in. Mind you, the National fit fine in the bore, but it seemed to drag on the roller bearing cage. There is nothing to stop the seal from bottoming out onto the cage as there is no outer flange/lip (as is present on the seal that comes with the roller bearing kit).

Yesterday I had time (and enough snow melt) to remove the hub again and try the new Timken seals. While doing so, I confirmed that the National seal was, indeed, dragging on the cage, as you can see in the shiny spots on the seal here.

The Timken seals fit the bore just fine, but they also bottom onto the roller bearing cage, locking the cage in place. And, I tried the seal both directions; The way it was meant to be installed...and the way that reverses the sealing surface, but still might work...except that the neoprene seal hits the step in the side of the inner bearing race and won't go into the hub.

All in all, a frustrating experience, but I did confirm that:

- For the CPP kit, the seals they sell you NEED the outer lip that bottoms the seal on the hub lip before it hits the roller bearing cage.

- The 6064 seals would have been perfect for the original roller bearings (that my truck ate long ago).

So then, back to the original question...

I will be ordering the correct seals from classic parts as they are the cheapest I have found so far. Would be nice to have a seal number just for future reference though.

Thanks for your patience,

Jim

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