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14ff vent tube size????

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by surpip, Oct 5, 2004.

  1. surpip

    surpip 1 ton status

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    when i got my axels they diddent have vent tubes, i was able to put a 3/8 NPT barb in the 60 but the 14ff hole was alot larger... anyone have any idea what size it is?
     
  2. 84_Chevy_K10

    84_Chevy_K10 Banned

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    3/8 NPT? Are you sure? That's pretty big! Holy fill hole size batman!
     
  3. surpip

    surpip 1 ton status

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    not that big but ya im almost positive thats what i used id have to check the tap to make shure
     
  4. 84_Chevy_K10

    84_Chevy_K10 Banned

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    You realize that a 3/8" NPT plug is over 1/2" in diameter right?
     
  5. surpip

    surpip 1 ton status

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    nope your way off i just looked the tap, you use a 5-16th drill to drill the hole
     
  6. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    [ QUOTE ]
    nope your way off i just looked the tap, you use a 5-16th drill to drill the hole

    [/ QUOTE ]

    Actually, Tim is right. Pipe thread sizes are way bigger than the number marked would imply, 3/8 pipe thread is indeed bigger than half of an inch. Double check the tap, since the tap required a 5/16 drill bit I'd say it's closer to 1/8 pipe thread.
     
  7. 84_Chevy_K10

    84_Chevy_K10 Banned

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    I *think* 3/8" NPT is 5/8-18 tapered thread.
     
  8. funkycold

    funkycold 1/2 ton status

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    I just bought this fitting from the dealer and it measures 7/16" on the fitting that presses into the housing.
     
  9. surpip

    surpip 1 ton status

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    cool thanks funky cold
    well tim might be right but i read the tap i used it said 3/8-16 right on it so i dont know what to tell ya
     
  10. funkycold

    funkycold 1/2 ton status

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    /forums/images/graemlins/thumb.gif
     
  11. 84_Chevy_K10

    84_Chevy_K10 Banned

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    [ QUOTE ]
    cool thanks funky cold
    well tim might be right but i read the tap i used it said 3/8-16 right on it so i dont know what to tell ya

    [/ QUOTE ]

    3/8-16 amd 3/8 NPT are two totally different things. A 3/8-16 tap is NOT tapered thread. 3/8 NPT is a tapered thread that you could thread a 3/8" inside diameter pipe into. Thus why it's 5/8" or so in diameter.

    You don't know what to tell me cause you didn't have a pipe thread tap in your hand. /forums/images/graemlins/waytogo.gif
     
  12. surpip

    surpip 1 ton status

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    the tap said exacally 3/8-16 NPT so if thats not NPT i dont know what it is i would take a picture but the writing is a little worn down and it wouldent show up in a picture. also the 3/8 npt barb fitting that i asked for at napa went right in so eaither way it worked and now i got to do the same thing to the 14ff but bigger
     
  13. surpip

    surpip 1 ton status

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    update***** i was way wrong!! between Tim and the Old- school guys over at Boeing I got schooled. i used a 3/8-16 NC tap on the 60. The hole size on the 14ff is 7/16th but there is no tap in NC for that hole size But they do make a NF tap for that size hole so ill se if i can find a fitting in that size
     

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