Any chance of machining and putting the seal on the outside like an automotive crankshaft seal
To: [email protected] CC: [email protected] From: [email protected] Date: Tue, 9 Mar 2010 14:31:40 -0500 Subject: Re: [ercoupe-tech] Oil leak at starter 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 _________________________________________________________________ Hotmail: Trusted email with powerful SPAM protection. http://clk.atdmt.com/GBL/go/201469227/direct/01/
