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Pcv? Blank Steel Line On F134

Discussion in 'Early CJ5 and CJ6 Tech' started by Mr Vaughan, May 6, 2021.

  1. May 6, 2021
    Mr Vaughan

    Mr Vaughan

    there is a steel line (similar to the fuel lines) that comes off of the PCV valve (i beleive), and it ends after less than a foot, and is just open. is it a vent?
     
  2. May 6, 2021
    55_Willys_CJ5

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    Can you post a picture? Here is a link to ScoutPilot's Old Jeep Carbs site with some pictures of a PCV set-up on the f134 Engine. Hope this helps. PCV For the F-134 | Old Jeep Carbs LLC
     
  3. May 6, 2021
    PeteL

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

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    Is that the only line on the PCV? It should connect to the intake manifold vacuum, and tee to the vacuum pump if you have one.
     
  4. May 6, 2021
    Mr Vaughan

    Mr Vaughan

    i don't have a vacuum pump, but it would make sense that that would have hooked into one at some point. the pump may not be the original. i'm at school now, but when i get home i can get a picture.
     
  5. May 6, 2021
    Mr Vaughan

    Mr Vaughan

  6. May 6, 2021
    scoutpilot

    scoutpilot Member

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    Here are your choices:
    1. Remove the dead-end tube and plug the 'T' fitting. Not recommended as the motor is supposed to have vacuum augmentation in the PCV system.
    2. Buy a dual-action pump and plumb the whole thing correctly. I see a lot of messy blow-by because of a dirty/non-functioning PCV system.
     
  7. May 6, 2021
    PeteL

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

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    I'm not clear about this.

    Isn't the vacuum from the manifold sufficient for PCV?

    The pump was to augment the vacuum for the wipers, I thought. How would the pump assist the PCV by its output?
     
  8. May 7, 2021
    scoutpilot

    scoutpilot Member

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    Yes, the vacuum pump was initially added to mitigate the performance fluctuations of the wiper system. At idle, they work fine. Accelerate and they will often just stop as the intake vacuum drops. Customers complained. Engineers discovered the additional, near-constant vacuum of the pump helped with the PCV for exactly the same reason.
     
  9. May 7, 2021
    Mr Vaughan

    Mr Vaughan

    i guess i might need to look for a different pump.
     
  10. May 7, 2021
    Mr Vaughan

    Mr Vaughan

  11. May 7, 2021
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

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    I think I'm missing something- the PVC is on the output side of the vacuum pump isn't it? I'd think the pump operation would reduce vacuum at the valve. :confused:
     
  12. May 7, 2021
    55_Willys_CJ5

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  13. May 7, 2021
    Mr Vaughan

    Mr Vaughan

    i don't have vacuum wipers though, so how would that be different?
     
  14. May 7, 2021
    PeteL

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

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    Exaktery my own thought (post #7). :confused::confused::confused:
     
  15. May 7, 2021
    scoutpilot

    scoutpilot Member

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    It should be connected to the inlet, or suction side.
     
  16. May 7, 2021
    55_Willys_CJ5

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    Plug off the end going to the vacuum wipers
     
  17. May 7, 2021
    PeteL

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

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    If so, where would you sent the output? And where would the wiper tube connect?


    This page has the inlet of the pump connect to the wipers, and the outlet to the PCV Tee. How I would do it, so that the wipers get maximum effect - pump and manifold vaccuum working in series...

    Crankcase Ventilation System on CJ3B.info
     
    Last edited: May 7, 2021
  18. May 7, 2021
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

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    Exaktery my own thought. :confused::confused:
     
    PeteL likes this.
  19. May 7, 2021
    scoutpilot

    scoutpilot Member

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    You don't. The pump was introduced to mitigate the wiper situation. So many complaints were received by Willys that the decision was made to go electric. What do we do with the pump? Engineer pipes up, "We can use it to augment the PCV system instead."
     
  20. May 9, 2021
    Don X

    Don X The Prodigal Moderator Staff Member 2023 Sponsor

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    The PCV line should run forward as shown in the picture and wrap around the front of the block. back down the side of the block and up to a manifold connection near the carb. Keep the PCV clean and clear and you won't have any need for a vacuum pump.
     
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