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240 rear main seal - viton vs old style??

posted by  Steve on  Sat Apr 19 14:47 CST 2003
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last visit: Fri Oct 24 07:16 CST 2014
[RELATED]

The Viton seal is VASTLY better and should last much longer than the silicone red/brown seal. It's a more robust seal. But there is one trick to installing it. If you don't have the new OEM seal installer tool with a lip, then do one of two things:

-cut away the inside protrusion on the seal holder (the plastic it is mounted on) and slip the holder on the crank and press the seal in place to make sure the seal lips are not turned under or are out of place OR

-get a piece of 1mm thick plastic card stock from a hobby store. Shape it using a hot air gun to the approximate curve of the crank. Using that card stock (which need be only 1-1/2 inches wide), work it between the seal and the crank and around so that the seal lips are fully seated against the crank. You are trying to force it in so that it pushes the lips back and out, then allows them to rest correctly on the crank when removed.

I learned this on my front crank seal, which leaked immediately since I somehow turned a lip or didn't seal it correctly. Using the shim stock solved the problem without removing the seal.






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