Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

2 very quick questions (pics inside)

Discussion in 'The Garage' started by 78Suburban, Dec 26, 2005.

  1. 78Suburban

    78Suburban 1/2 ton status

    Joined:
    Jul 4, 2005
    Posts:
    2,609
    Likes Received:
    0
    Location:
    Georgia
    I would REALLY REALLY appreciate any help with these questions.
    What is this thingey in front of the egr valve? [​IMG]
    What is this vaccume port on the very top back of my electric choke carb? [​IMG]


    do I need to find a way to plug both of them? if so, what is the best way?
    Thanks to all the ck5ers that have helped me with this motor swap. I'm almost done with it now. Before I found ck5, I was barely confident at changing spark plugs :doah:
    THANKS SO MUCH,
    James :wink1:
     
  2. dremu

    dremu Officious Thread Derailer Premium Member

    Joined:
    Feb 27, 2000
    Posts:
    15,954
    Likes Received:
    445
    Location:
    East of San Francisco
    I think that's only one question. IIRC, that thingy is a heat riser or some kind of thermal valve, and I seem to recall it having a bent hardline going to the back of the carb, i.e. that open port you pic'd.

    If no-one else posts up, lemme know and I'll go tear off an aircleaner and get a pic for you.

    -- A
     
  3. Cricket

    Cricket 3/4 ton status

    Joined:
    Nov 29, 2004
    Posts:
    8,224
    Likes Received:
    0
    Location:
    Colorado
    I'd agree the first pic is a heast riser tube - now missing. On my 77 it ran up to the q-jet choke dashpot.

    2nd should go to your aircleaner base.
     
  4. 78Suburban

    78Suburban 1/2 ton status

    Joined:
    Jul 4, 2005
    Posts:
    2,609
    Likes Received:
    0
    Location:
    Georgia
    i'm so lost.....

    so what does the heat riser thing do? is it something to do with the choke, or emmissions, or what? could I just block both off and call it good?
    thanks,
    James
     
  5. Muddytazz

    Muddytazz 1 ton status

    Joined:
    Jun 30, 2002
    Posts:
    20,073
    Likes Received:
    0
    Location:
    Salem, Or.
    The heat riser tube was for the older style stove pipe chokes (non-electric) you can just plug the hole.

    The second pic i'm in agreance with, base of air cleaner
     
  6. beater_k20

    beater_k20 Banned

    Joined:
    Dec 9, 2003
    Posts:
    10,276
    Likes Received:
    0
    Location:
    Elkhart, IN
    it warms the choke coil. with an electric choke, you no longer need it. it is actually a tube that is looped inside the intake manifold and cylinder head. shouldnt hurt anything like it is, unless it rusts out.
     
  7. 78Suburban

    78Suburban 1/2 ton status

    Joined:
    Jul 4, 2005
    Posts:
    2,609
    Likes Received:
    0
    Location:
    Georgia
    so am I understanding this right, just plug the port on the back of the carb, and plug the heat riser thing on the manifold? should I just take the heat riser plate off the manifold and make a sold plate to replace it?
    thanks,
    James
     
  8. dave_90_blazer

    dave_90_blazer 1/2 ton status

    Joined:
    Jan 1, 2004
    Posts:
    688
    Likes Received:
    0
    Location:
    Melvindale, Michigan
    I always do, but i recommend not doing it unless you are pulling the intake, there will be lots of carbon built up inside, and it will be very hard to pull the tube/plate out
     
  9. 79k20350

    79k20350 3/4 ton status

    Joined:
    Nov 22, 2004
    Posts:
    7,757
    Likes Received:
    1
    Location:
    Ct
    just go get some rubber nipples tocover the prts. i got mine at autozone. a whole pack like 5 ea of 7 or 8 sizes for 5 bucks. its nice to have a few differant ones when you need em.
     
  10. 78Suburban

    78Suburban 1/2 ton status

    Joined:
    Jul 4, 2005
    Posts:
    2,609
    Likes Received:
    0
    Location:
    Georgia
    I'm gonna plug the port on the back of the carb and on the left of the heat riser plate, both with rubber caps. But what about the hole on the right side of the heat riser plate? does it need plugging? how should I plug it if so?
    thanks,
    James
     
  11. y5mgisi

    y5mgisi 1 ton status

    Joined:
    Aug 11, 2002
    Posts:
    17,156
    Likes Received:
    247
    Location:
    Portland Oregon
    hy man looks like your comin along well. anyway you probly dont even need to do anything at all with the two holes on the manifod it self. Is acually one tube that goes into the manifold about 4 inches than circles back and comes out at te other hole. basicly just a " U " so theres no vacume or anything like that going to it, nothing will happen if anything gets in, and nothing will come out. as for the port on the back of the carb, as the others said run a vac. line from it to the air cleaner base.
     
  12. dave_90_blazer

    dave_90_blazer 1/2 ton status

    Joined:
    Jan 1, 2004
    Posts:
    688
    Likes Received:
    0
    Location:
    Melvindale, Michigan
    no, doesn't need to be plugged, it is just a loop of tubing that is inside the exhaust crossover
     
  13. bigbadchev84

    bigbadchev84 1/2 ton status

    Joined:
    May 17, 2004
    Posts:
    2,191
    Likes Received:
    0
    Location:
    Hermiston, Oregon
    i bet it would melt a rubber cap if you put it on there, they get a little warm
     
  14. 76zimmer

    76zimmer Flyin Rat Premium Member GMOTM Winner

    Joined:
    Nov 14, 2005
    Posts:
    23,030
    Likes Received:
    1,347
    Location:
    Kzoo, Mi
    Pull the choke coil plate off the manifold, cut the tubing off, then make a hi temp gasket to go under the plate, and use hi temp form-a-gasket to seal it up. The back of the carb vac port can be plugged with a cap.
    Do you have power to your choke coil on the carb?
     

Share This Page