Seems like a few things need to be verified.
1. Is the ID of the seal correct for the diameter of the pinion? I assume that when the pinion is inserted, it stretches or puts some pressure on the seal? How much is correct I do not know. It can't have a gap and has to have some pressure to prevent oil pushing past.
2. is the pinions the correct diameter? Is it round? An old pinion will have wear where the seal is. I've seen sleeves used to make up for that wear, but I don't love them because they will create a diameter larger than the original.
3. Is there any radial movement on the bearing allowing the pinion to move against one side of the seal?
4. Is the bore for the race round and concentric with the seal bore?
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If someone else can design it, I can sure figure out how to fix it.
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