Home › Forum › Ask A Member › Crankshaft O Ring, 3 HP Johnson 1961 JW-17 › Reply To: Crankshaft O Ring, 3 HP Johnson 1961 JW-17
Mine is in a ’68, even though the ’68 parts manual doesn’t show it. My o-ring is in pretty good condition, although slightly flat. I was wondering if it was some kind of additional slinger but I don’t know where it would sling anthing TO. Maybe it acts as a kind of labyrinth seal.
I don’t know why they added the oring, wasn’t even aware that they did that. Those crankshaft slingers do a pretty good job of directing oil/gas back down through the intake manifold. The oring must be in addition to the slinger, acting as an upper seal…It surely can not hurt to put in back in place, the oring lasted all these years, don’t think it’s gonna fail now…Hmmm, I better keep my mouth shut, who knows how today’s fuels might react with it….