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134 Fhead Surge While At Idle

Discussion in 'Early CJ5 and CJ6 Tech' started by jeepstar, Aug 8, 2016.

  1. Aug 11, 2016
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member Sponsor

    Tantallon, Nova...
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    Glad you got it :)

    If I were you I'd do some research into the various PVC installations that were used over the years & determine what you need to make yours correct- that draft tube certainly isn't part of a proper setup.

    If the carb is loose then the nuts were never properly tightened after the last time the carb was off.

    H.
     
  2. Aug 11, 2016
    jeepstar

    jeepstar Sponsor Sponsor

    Sheboygan
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    I moved the hose from the valve cover breather to the dipstick tube. Is this correct? 20160811_163902.jpg
     
  3. Aug 11, 2016
    jeepstar

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    Put a filter on the valve cover thing. This is correct? The blue one... 20160811_164109.jpg
     
  4. Aug 11, 2016
    jeepstar

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    Sheboygan
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    Just plug the downdraft tube?
     
  5. Aug 11, 2016
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

    Apopka, Fl
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    No, let it breathe like it does now.

    Actually, with the engine running do you feel pressure coming out of it? Or by chance is air being sucked in?
     
  6. Aug 11, 2016
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

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    You don't have the original air cleaner setup, no big deal. The little filter is ok as is, and the same with the way the hose is now.
     
  7. Aug 11, 2016
    jeepstar

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    Sheboygan
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    Thanks all for the patience!!!! Sometimes its the simple things that go unnoticed.
     
  8. Aug 11, 2016
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

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    Did you see my edit about the draft tube?
     
  9. Aug 11, 2016
    jeepstar

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    In the house now. 90 out. Ill check tomorrow
     
  10. Aug 11, 2016
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

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    Was 90 here, but we had a nice rain so it fixed that. :)

    After thinking on it you most likely will be able to plug that draft tube. Vacuum reading will probably go up.
     
  11. Aug 13, 2016
    1960willyscj5

    1960willyscj5 Well-Known Member

    Mesa, Arizona
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    This engine is in your CJ, right?
    Some one has switched the valve cover or the whole engine was swiitched. That cover and those fittings and hoses going to it are for the early pickup and stationwagon motors.
     
  12. Aug 13, 2016
    jeepstar

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    Sheboygan
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    Yeah? Its the motor that came with my cj. Bout all i can tell you. Now i can tell people i have a rare one!
     
  13. Aug 14, 2016
    55_Willys_CJ5

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    Glad to read you found the cause of your surging being the carb being loose, which was causing a vacuum leak.

    Suggestion - If you can and have the room. Connect the hose from the PCV valve to the breather cap on the intake valve cover. Move the filter to the line on the oil fill/dipstick tube. This will allow clean air to flow through the oil tube into the crankcase/block and then up into the valve cover. From the valve cover through the PCV valve into the opening below the carb upon which it will get mixed in with the gas/air from the carb and sucked into the combustion chamber of each piston during the intake stroke. take a look at this image:
    upload_2016-8-13_23-10-37.png
    Found it here - Willys M Jeeps Forums-viewtopic-Milky White paste inside of Oil fill neck

    I'm not sure if the picture is from a service manual that covers your jeep. Based on the photos that you posted, this appears to be how it would have been set up at the factory. If the PCV system is working properly you will feel air being sucked in at the draft tube. My understanding of how the draft tubes worked was the air rushing by the opening created a vacuum that would pull the gases out of the crankcase/block and this design was used on the early models before they incorporated a PCV system. I could be off though.


    Glenn, that appears to be the piece that moves inside the PCV valve assembly to restrict the air flow. See above posted image.
     
    Last edited: Aug 14, 2016
  14. Aug 14, 2016
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

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    I have an NOS one of those actually, but didn't realize it was the same thing at first. It looks like a bunch of gunk was on his.
     
  15. Aug 14, 2016
    jeepstar

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    Sheboygan
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    So should i plug the draft tube?
     
  16. Aug 14, 2016
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member Sponsor

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    Assuming you follow 55_Willy's excellant advice above I would remove it & replace with an appropriately sized fender washer & gasket.

    H.
     
  17. Aug 14, 2016
    55_Willys_CJ5

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    x2
     
  18. Aug 16, 2016
    jeepstar

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    Holy crap! I did all of the above, and this thing flies!!!(y)(y)(y)
     
  19. Aug 16, 2016
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

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    Sounds like it must run better than ever before. :coffee::)
     
  20. Aug 16, 2016
    jeepstar

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    I think the properly seated carb was the main reason it runs so much better :lol:
     
    Last edited: Aug 16, 2016

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