I'm restoring a 1959 TR3A (frame off). Now doing the engine rebuild.
I upgraded the rear oil seal with the German Barstuck kit that adds a Viton seal but still maintains some of the original "labyrinth" and does NOT require any machining of the crank. I do have a couple of issues with that, but at least it incorporates some more modern technology. The issues have to do with the seal not being "locked" into position in the aluminum housing, It rotates with the crankshaft and moves fore and aft. Having done that mod. though, it seems pretty darn achaic to cram the Peramtex-soaked fiber into those grooves. Wouldn't it be better to cram some silicone o-ring stock into those slots? I will take some measurements, but I'm thinking a diameter between ¼" - 3/8" would be good. That material is available from Amazon -- not cheap, but available.
Rear Crankshaft Oil Seal
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