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leaky 208

Discussion in 'The Garage' started by bigbadchev84, Aug 2, 2005.

  1. bigbadchev84

    bigbadchev84 1/2 ton status

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    np208 is leaking like crazy, i have put numerous new seals in it and it still leaks, where do i go from here?
     
  2. steve_kibbe

    steve_kibbe 1/2 ton status

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    Where is it leaking from?

    Is the case cracked?

    Is the vent tube cloged?

    Are you over filling it?
     
  3. bigbadchev84

    bigbadchev84 1/2 ton status

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    it is only leaky from around the slip yoke, case is fine, i havent checked the vent, i even siliconed the seal in this time, filling it up till it pours out of the top fill plug, and the yoke does not have the little hole in the center of it either
     
  4. BrianDamage

    BrianDamage 1/2 ton status

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    when I replaced the seals in mine, the guy at the GM dealer said the main mistake folks make when doing those is not replacing the race inside the yoke...it gets dinged up from taking the shaft in and out and fluid ends up leaking from it. When I did mine, I took the tail section off the transfer case, and replaced everything in it. Got everything from the dealer. Hasn't leaked since.

    He also told me not to use RTV sealant onit, to use a GM anaerobic sealant that GM recommends..it cures without air. It was only 1 or 2 dollars for a little tube enough to do the tail section.

    part # on the sealant =

    GM part # 1052942 "Gasket Maker"
     
  5. 88K5Jimmy

    88K5Jimmy 1/2 ton status

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    My 208 output would seal for a while but then it would begin to leak and drip after a while. I was told to put some grease on the seal before putting the shaft back in so the shaft wasnt turning on a dry seal. It hasn't leaked since.
     
  6. bigbadchev84

    bigbadchev84 1/2 ton status

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    where is this race located? how much did it cost roughly? thanks
     
  7. BrianDamage

    BrianDamage 1/2 ton status

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    looking at the exploded view I don't know if it's really called race or not.... and sorry, but my scanner doesn't work , so I had to take a picture of the diagram with my camera.

    The part I'm talking about is #11 (2nd from left). it fits inside the tailpiece. It doesn't cost much at all from the dealer. I replaced parts 12,11,8,7 for sure and I THINK 6 & 5 also, and the speedo gear and I had like $45 in it all.

    I got this exploded view from the Chevy dealer.

    The guy at the parts counter wrote part # 8655031 on it....can't remember what all that entailed...it may the # for that piece... you can have them check.

    Hope this helps.

    np208.jpg
     
  8. dieselponyexpress

    dieselponyexpress 1/2 ton status

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    It's more likely a bushing than a race.

    And yes, you should change it along with the seal.

    According to my 85 parts catalog GM # for the bushing is 3978765
     
  9. BrianDamage

    BrianDamage 1/2 ton status

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    you are right sir

    I looked up the # and came up with "bushing, exterior housing"


    that part # I posted is for the seal btw
     

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