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F134 Pcv

Discussion in 'Early CJ5 and CJ6 Tech' started by kenb, May 20, 2020.

  1. May 20, 2020
    kenb

    kenb Cleverly disguised as a responsible adult

    Detroit
    Joined:
    Jan 22, 2019
    Messages:
    677
    Hello,
    I've seen two PCV outlet port locations for the F134. One is on the pushrod cover and the other is on the rocker arm cover. From what I gather the rocker arm cover is the later version. Does anyone know why the change was made?
    I've noticed my rocker arm cover PCV port seems to pull oil to a degree. I get oil drips from the rubber hose I'm using. I have the parts to convert to the pushrod cover and was wondering what the pros and cons would be for this change.
    Thanks,
    Ken
     
    kenb, May 20, 2020
    #1
  2. May 20, 2020
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Hills of NH
    Joined:
    Aug 3, 2003
    Messages:
    9,832
    Just guessing, maybe when vacuum wipers from the dual-action fuel pump were deleted? Someone here will know.
     
    PeteL, May 20, 2020
    #2
  3. May 20, 2020
    jeepstar

    jeepstar Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Sheboygan
    Joined:
    Jun 28, 2006
    Messages:
    2,774
    just checked the manual, i couldnt find anything about the PCV, or downdraft tube:confused:

    upload_2020-5-20_10-17-26.png
     
    jeepstar, May 20, 2020
    #3
  4. May 20, 2020
    scoutpilot

    scoutpilot Member

    Asheboro, NC
    Joined:
    Jun 7, 2014
    Messages:
    431
    Can you post pictures of both sides of the motor?
     
    scoutpilot, May 20, 2020
    #4
  5. May 20, 2020
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Tantallon, Nova...
    Joined:
    Nov 22, 2003
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    8,126
    I believe that the side mount design is earlier as it was used on l4's long before those fancy-shmancy OHV cover thingies came along.
     
    Howard Eisenhauer, May 20, 2020
    #5
  6. May 20, 2020
    Bobcreag

    Bobcreag Bob C

    Danville, CA
    Joined:
    Nov 5, 2014
    Messages:
    58
    I have a 1965 CJ-5 with an F-134 with vacuum wipers and the dual-action (vacuum and fuel) fuel pump. My PCV valve draws vapors from the top of the rocker arm cover. I have seen pictures of earlier F-134's where the crankcase vapors are drawn from the pushrod/engine side cover.
     
    Bobcreag, May 20, 2020
    #6
  7. May 20, 2020
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Hills of NH
    Joined:
    Aug 3, 2003
    Messages:
    9,832
    Wikipedia...

    "Although the modern purpose of a positive crankcase ventilation (PCV) system is to reduce air pollution, the original purpose was to allow an engine to operate underwater without the water leaking in. "

    Gee... that's sounds just like a military Jeep doesn't it?
     
    PeteL, May 20, 2020
    #7
    Bobcreag likes this.
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