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Thread: '85 K100 I'm confused, what is the "rear main seal" and what is causing my leak

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    '85 K100 I'm confused, what is the "rear main seal" and what is causing my leak

    Hi all,

    Thanks in advance for the info. I started out just intending to lube the splines, but now found oil in my clutch housing. Don recommend that I replace the clutch-nut O ring, which I am going to do. But looking thru Haynes Manual, I can't see what exactly is this "rear main seal" that people purport to be a major cause of oil leaks into the clutch housing which dribbles down the opening onto the gearbox bottom which I also have.

    Are the clutch nut O ring the same as the rear main seal? If not does any one know where on the microfiche will I be able to see what the part actually look like?


    Can I just spray brake cleaner to get the oil out?


    Thanks again
    Last edited by deilenberger; 03-28-2013 at 11:06 PM. Reason: added year/model to title

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