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Old 11-29-2015, 08:47 AM   #1
Model51
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Default Truck driveshaft-torque tube grease seal

I'm trying to locate a newly manufactured drive shaft grease seal that sits in the torque tube after the drive shaft bearings. The Ford part number is BB-4686 and fits 1932 through 1939 (big trucks, not pickup or commercial). The attached image is an example, but damaged. I'm restoring my truck and now is the time to put new seals in. I think the rubber on a NOS seal would be old and hard, so that's why I'm looking for a newly manufactured seal. The original in my torque tube looks ok, but I have no way to test it to see how well it keeps the grease where it belongs. If it helps, here are some dimensions: outer seal diameter (bore) 2.105", shaft diameter 1.370", thickness 0.469" (15/32").
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File Type: jpg Driveshaft Grease Seal BB4686.jpg (80.3 KB, 11 views)
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Old 11-29-2015, 08:59 AM   #2
rotorwrench
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Default Re: Truck driveshaft-torque tube grease seal

Looks like a Chicago Rawhide seal. It may have been a leather seal. If the ID, OD, and thickness measurements are standard fractional sizes, a seal could be sourced through a bearing & seal supply company. If not, as you posted, it may have to be an NOS. Leather needs a bit of oil to rejuvenate it if it is in good condition. I've seen old leather seals come back to life before.
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Old 11-29-2015, 11:20 AM   #3
Bob C
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Default Re: Truck driveshaft-torque tube grease seal

Here you go http://www.napaonline.com/Catalog/Ca...602_0297663292
Rock auto has it for $4.33 National Seal # 472287.

Bob
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Old 11-29-2015, 01:56 PM   #4
40Pickup
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Default Re: Truck driveshaft-torque tube grease seal

Didn't that greaser sealer have an additional built in function as a trust washer for the bearing?

Jorgen
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Old 11-29-2015, 03:59 PM   #5
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Default Re: Truck driveshaft-torque tube grease seal

Thanks for your reply. The seal is a rubber compound with an internal spring for tension.
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Old 11-29-2015, 04:02 PM   #6
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Default Re: Truck driveshaft-torque tube grease seal

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Bob C - Thanks for the NAPA link. I'll have to look at one. One difference is the thickness and also, ans 40 Pickup mentioned, it may have to be strong enough to take some thrust. I'll have to check out the entire assembly (bearings, speed drive gear, etc.) to figure this out. If it's a simple as making an appropriate thickness washer, then this may do the trick.
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