John,
Your point is well taken. I should have said "...one need only replace the seal AND BUSHING to banish it for another fifty years." Still both simple, cheap and effective long term. Thanks! WRB -- On Mar 9, 2010, at 13:31, John Cooper wrote: > On 3/9/2010 2:06 PM, William R. Bayne wrote: >> I would think the "perfect balance" in which the >> seal allows just enough oil to stop bushing wear (not absolutely, but >> a >> definite rate reduction) would last a very long time; and when that >> first drop of oil does make it to the end of the shaft, one need only >> replace the seal to banish it for another fifty years. >> > No, the problem is that once the bushing wears the shaft can move > around > enough that the seal doesn't seal effectively. A new seal my slow > things > down for a while, but the real problem is not the seal but the shaft > movement. > > As far as the legality of machining the case to accept the seal, I > don't > see it as an issue. Most starters that I have seen have already been > modified. My only concern is that the correct seal be used, which is > quite thin. I've seen starters with the wrong seal where the metal lip > of the seal protrudes and bears on the starter drive gear. > > Skyport stocks the correct seal. > > I guess what I'm really saying is that if, 50 years ago, no one worried > about the occasional drip, nothing would have changed and there > wouldn't > be any starters leaking more than the occasional drip. Modifying the > case for the seal also reduces the length of the bushing and reduces > the > axial bearing capability, which contributes to the wear and ultimately > the leak. The law of unintended consequences... > > -- > John > Skyport East > www.skyportservices.net > > > > ------------------------------------ > > Yahoo! Groups Links > > >
