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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
     
  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:
    9,820
    Just guessing, maybe when vacuum wipers from the dual-action fuel pump were deleted? Someone here will know.
     
  3. May 20, 2020
    jeepstar

    jeepstar Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Sheboygan
    Joined:
    Jun 28, 2006
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    2,772
    just checked the manual, i couldnt find anything about the PCV, or downdraft tube:confused:

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

    scoutpilot Member

    Asheboro, NC
    Joined:
    Jun 7, 2014
    Messages:
    428
    Can you post pictures of both sides of the motor?
     
  5. May 20, 2020
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Tantallon, Nova...
    Joined:
    Nov 22, 2003
    Messages:
    8,122
    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.
     
  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.
     
  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:
    9,820
    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?
     
    Bobcreag likes this.
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