Re: ’58 Big Twin Lower Crank Seal

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February 12, 2017 at 2:27 pm #52872
frankr
Participant

    Both

    Edit: Well actually in the case of a fleetwin the bronze bearing is enough for sealing the crankcase compression, so the carbon seal is more for keeping the water out of the crankcase (and drive shaft splines). In the case of the Big Twin with a roller bearing, it does both–keep the water out and crankcase compression in.