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225 V-6 Vent Holes?

Discussion in 'Early CJ5 and CJ6 Tech' started by digitaljjd, Jul 28, 2009.

  1. digitaljjd

    digitaljjd New Member

    225 V-6 Intake Manifold Vent Holes?

    Thanks for all the help guys. I think I need to just stop with this Jeep that's not even mine. I'm trying to get it running like it should. So...now it's come to having to rebuild the carb. I figure, if I fail at that, I'll just have to get a new one anyway, so why not try. I have the service manual and links to adjustment etc. My problem is, once I took off the carb, the gasket was decimated into this powder like substance. There are holes leading into the intake manifold that are completely filled with $#!+ like packed in mud/carbon?. Are those vent holes that need to be opened? And how in the hell do I clean those out without having to pull the entire manifold off?(which I would not like to do) I've been digging the holes out with the end of a hanger and a vacuum, but without knowing how big the holes are, and how far they go back, before a turn etc. I don't want to keep digging without knowing what they are exactly. Anybody know about a 225 Dauntless V-6 intake manifold?
     
    Last edited: Jul 28, 2009
  2. matthew johnson

    matthew johnson Major League Infidel

    Stick the vacum into the manifold then seal it off completly with tape and start digging the carbon out. The vacum will get most of it and the rest should get spit out when you get it started. Thats what I did and had no problems.
     
  3. sparky

    sparky Sandgroper Staff Member Founder

    They let exhaust move through the manifold to preheat the carburetor and become carboned up.
     
  4. Patrick

    Patrick Super Moderator Staff Member

    I leave mine plugged up. Carefully scrape the cabon off the gasket surface..
     
  5. digitaljjd

    digitaljjd New Member

    Thanks! Does the hole bottom out and another hole come in from the side wall?
    I started using a hand held drill bit to scrape out the crap, but it seems to be bottomed out. Hopefully it will blow out, but it is packed solid, so I kinda' doubt it. Is that supposed to be a vapor return? Basically the posts after yours say I don't really need it, is that right guys? I guessing for warm start-ups only?
     
  6. matthew johnson

    matthew johnson Major League Infidel

    I belive they are for the air at idle? There are two adjustable screw at the front of the carb for this. As for leaving them plug, I dont know why but since you are in there I would clean them out. Cant hurt. (famous last words)
     
  7. Patrick

    Patrick Super Moderator Staff Member

    No, not for air at idle. They are an exhaust crossover to heat the carb base in cold weather. In factory form there was a valve on the RH exhaust pipe at the manifold that would close when cold, forcing exhaust gas up through the crossover in the intake manifold. I don't use the heat riser valve any more and the exhaust in the manifold corrodes the front two carb. bolts.
    So, when I have my carb off every so often I just clean the carb. mounting surface and leave the crossover ports full of carbon.
     
  8. Walt Couch

    Walt Couch sidehill Cordele, Ga. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Patrick has it right.. and dont be using a drill in there because you will drill into the intake part of the manifold and ruin it. These two holes are in the exhaust port (hence carbon) and do nothing but eat away your front carb bolts (I live in the south) because I dont worry about supper cold starts. Leave them packed solid....
     
  9. matthew johnson

    matthew johnson Major League Infidel

    Learn a little something everday.:):beer:
     
  10. BajaEdition

    BajaEdition cj6 owner

    you know the 225 tech here is amazing,
    I have to admit, for a 45 year old engine it has a great and dedicated following, Since I joined this forum in the last six months I have learned so much about his engine I could never have found out about others.
     
  11. Patrick

    Patrick Super Moderator Staff Member


    Someone's gotta love 'em.
    You learn a few things when it's been your daily driver for 12 years.;)
     
  12. digitaljjd

    digitaljjd New Member

    Funny, I thought that about the bolts when I was checking the new gasket to make sure it fit. Just to clarify I wasn't actually drilling out the holes, I was just using a drill bit by hand to lightly remove the caked on carbon after I got the hole started. Wish I would have left them plugged up now. Again, thanks for the help everyone.