I have a flywheel hub sealing problem that I would like to better understand. The hub has a groove worn from the oil seal, and the factory specs book lists a minimum diameter that the hub can be turned to. This is for a 64 Porsche 356. The oil seal is 60mm viton single lip. The hub diameter is 59.995 mm and the groove is 59.84 mm. The Porsche spec book says the hub wear limit is 59.70 mm, so the flywheel has plenty of meat to turn down the hub and stay within that spec. But that spec is 60 yrs. old, seal materials have changed, and maybe thinking about oil seals has changed. The other option I have is to install an SKF Speedi-Sleeve, which will actually increase the hub diameter by .559 mm, to 60.55 mm. If the hub is turned to 59.84 or less, there is no Speedi-Sleeve available that will end up with the original hub dia., but a custom press fit ring is always a possibility.
So which option will result in the best sealing and seal life: using a 60mm (2.362") seal on a 60.55 mm (2.384") hub, or using a 60mm seal on a 59.84mm (2.356") hub? i.e. is .006" undersize going to give a better seal and more seal life than .022" oversize? The engine will be newly rebuilt, balanced.
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