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  1. #1
    Join Date
    Feb 2006
    Location
    Denver, Co
    Posts
    512

    20R Front Main Seal

    Hey Mark,

    I'm changing the front main seal on a 20R motor in a 1980 4x4 Truck. People say that if the seal is old, it will wear a groove in the crankshaft so getting a thinner seal is best so that it seals on an un-grooved part of the crank.

    What engine/car will have a seal that will work?

    Thanks,

    Kyle

    P.S. Also, any idea what other seals commonly leak on this engine other than the valve cover (already doing that too)? Thanks

  2. #2
    Join Date
    Jul 2004
    Location
    Vancouver, WA, USA
    Posts
    3,647
    Use the late model 22RE seal (pn 90311-45014). It changes where the seal rides on the pulley so that you're running on a new surface. I'd go ahead and replace the oil pump o-ring while I'm there. As for leaks...oil pans are pretty common on the 20R, especially around the drain plug area, but outside of that they were a pretty good oil retainer. Leaky valve covers are due to substandard parts (Felpro for instance) or just being on there tooooo long.

    Main Seal $11.47
    Oil Pump O-Ring $8.08

    Thanks!
    Mark

  3. #3
    Join Date
    Oct 2006
    Location
    St. Cloud, MN
    Posts
    3,615
    My dad used to have an '80 4X4 truck too. The distributor O-ring got hard with age and leaked, so you may want to check/replace that, too.

    Thanks for that info on the front seal, Mark!

    Dan (DragonLady's husband) *RIP Tyler (2yo son lost to cancer)
    1986 P-type (Ruffian) black 6M 5 speed (formerly Lexusboy's), sitting.
    1986 P type MKII 2tone night blue met/silver met. 5MGE auto, waiting for summer.
    2005 Dodge Magnum Magnesium Pearl - new family car!
    2000 Chrysler Town & Country - Charcoal, family/stuff hauler

  4. #4
    Join Date
    Jul 2004
    Location
    Vancouver, WA, USA
    Posts
    3,647
    NP...and yes, Distributor O-rings can go bad, but not nearly as often as front main seals do on this particular application.
    Mark

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