Originally Posted by
wagoo
How did I miss this thread Steve?
Just last week I finally traced and fixed a swivel seal leak that has been bugging me for about 8 years. Having portals that share the lubricant supply with the rest of the front axle, I don't have the option of using grease in the swivels. For ages I couldn't trace where the oil was getting out, but last week decided to wash everything down and lay under the truck until oil began to appear again.It turned out that it wasn't getting past the lips of the seal, but from around the outer circumference through the recessed seat in the outer swivel housing and out from under the metal seal retainer.
I removed the 6 bolts from the retainer and pulled the seal away to have a look. I noticed a thin uneven layer of crud in the machined recess of the housing where the inner edge of the seal body seats against. Oil was getting past the gaps in the layer of crud, so with a sharp scraper I cleaned the crud away, reinstalled the seal, refilled with oil and lay down for another half hour to check for leaks. Sure enough oil began to creep out again from under the metal retainer, so I deduced that the retainer wasn;t applying enough pressure against the seal for it to seat correctly in the outer swivel housing. I thought about cutting a large shim from thin sheet metal to fit between the retainer and the seal, but then elected instead to attack the retainer with a ball ended hammer to apply more seating pressure to the seal.
The repair was 100% successful, no leaks or seeping whatsoever, despite my seals being old, bent and banged up from regularly ploughing through and over fallen trees and branches on my land .
One other factor that determins the effectiveness of the swivel seal, is how much off centre the outer swivel housing is in relation to the swivel ball. This is adjustable by transposing shims between the upper and lower swivel pins, once you have acheived the correct preload.I check mine with a vernier with the seal removed.
Wagoo.