Nice find Tim. A bit of orange under the green? Was that the primer colour or a rebrand that was unbranded?
Seals check out with the metric dimensions.
Curious if there is a rule of thumb with interference on seals. The outside measured at 35.15 mm. About .006" over. How much interference is ideal at the lip diameter/crank?
Thanks for checking the seals Cory.
It does show what looks like red oxide primer but I'll have to get a closer look today. I've never seen that before if that's what it is. I checked.
The saw is a complete sears repaint. No tag, just a SN stuck on the rear handle with the bilingual lablels. Made in the US and ship;ed here. It does have an operator presence lock so I assume it was made for CDN sales.
There are standards for oil seals so they are all within these specs from the different manufacturers . I have never seen a spec for the shaft to sealing lip interference.
case to bore interference spec for a metal case seal is +.005" +/- .002" for seals with a bore 2" or less
Case to bore interference spec for a rubber cased seal is +.008, +/- .003" for seals with a bore 2" or less
That may change in application depending upon case material , operating temps etc.
I've found on the new seals that are correct for the application that the sealing lip interference with the shaft is close to .040" Somewhat difficult to measure as the material is pretty soft.
Both SKF and Timken have great info in their on line seal catalogs for design, materials, etc.
Oil seals are generally (certainly the ones we use) within these specs
RMA = Rubber Manufacturers Association
SAE = Society of Automotive Engineers
ISO = International Organization for Standardization
DIN = Deutsches Institut für Normung
