Reference: C8A HUP grease seals

[Malcolm Towrie]

Dave, I think I have the solution.
SKF make very neat sleeves specifically to restore shaft damage under lip seals. If I install one of these Speedi-sleeves, part number 99147 on each axle shaft, that will bring the diameter under the seal up to 1.512" since the shaft was originally 1.490" and a speedi-sleeve is 0.011" thick.
Luckily, I found some 3.25" x 2.490" mechanical tubing at the museum, so I can machine a spacer ring with an od of 3 1/16" and an id of 2.250". This will press fit into the existing bore in the axle and then we can press fit SKF seal number 15141 into the spacer and that should seal well on the speedi-sleeve.

I understand this is not an easy option for most but I'm afraid that's what it seems to take to replace this seal. Total cost of this option is $10 for the seal, $50 for the speedi-sleeve, and maybe $100 for getting a shop to make the spacer ring. Not a cheap fix!
Malcolm
PS As I said above, I'm not convinced this seal needs to seal for street driving. So to pay for the full fix may be a waste of money. After all, our HUP had the original leather seal, an extremely corroded axle shaft land under the seal, yet no obvious leakage of diff oil into the eggshell. It was grease that leaked big time into the drum. The big grease seal is the critical one.

[Malcolm Towrie]

I've replaced the three types of seals in the HUP front axle.

For the axle oil seals (the ones closest to the diff), I used SKF part number 38x65x10 HMS5 RG.
This seal fits snugly on the 1.490" diameter axle, but to make them fit in the axle tube ID OF 3.060" I had to machine two rings with 3.063" OD X 2.559" ID. This gives a nice press fit of the ring into the axle tube bore, and a nice press fit of the seal into the ID.

For the large grease seals installed in each drum/hub assembly, I used SKF part 49998. These were also a very nice fit in the bore and on the hub.

For the pinion seal, SKF 22382 was a good fit.

Malcolm

[Hanno Spoelstra]

Malcolm, good to hear you got it sorted and posted the details here for future reference

[Hanno Spoelstra]

Jordan Baker posted this photo of the modern inner axle seal on his C15A.

Posted here so we can see what an inner axle seal looks like

AC6CF1BB-D49B-419E-94BB-2E3CD5ED77A0.jpeg