Originally posted by Davidh
View Post
Leaking shaft seal assemblies are either repaired or replaced. The major cause of a shaft leak is a crack or scratch of the seal inner bore where the cup-seals outer edge makes contact; that portion of the rubber that makes the watertight seal between seal and inside bore of the shaft seal body. My seal bodies today are machined pieces of polyurethane sprue. A cracked or scratched inside bore would permit water to flow around the outer rubber seal lip, through the crack, letting water into the motor bulkhead.
I see that you are adhering the rubber cup-seal outer lip with adhesive. Stop doing that! Use silicon oil (not silicon grease!) to lubricate the outer and inner seal lips during assembly.
Typically the manufacturer supplies the cup-seal with an inner lip diameter slightly smaller than the stated diameter of shaft it is supposed to seal against. In our sizes that's a few thousandth's of an inch smaller. They don't have to be tight.
Are you using proper cup seals or the spring tensioned seals used by the piston crowd?
David
Comment