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Now That The Engine Is Back.....

Discussion in 'Early CJ5 and CJ6 Tech' started by mickeykelley, Mar 17, 2018.

  1. mickeykelley

    mickeykelley Well-Known Member

    So now that the engine is back from the rebuilder, I'm taking off a few pieces to get powder coated before I stab it back in. However, I noticed there are a number of plugs in the head and I'm curious what they were used for back in 58. For example, on the back of the head where that oil line goes up the back corner of the head there is a plug.
    image.jpg
    Then there is one at the back of the head on the passenger side which I'm pretty sure goes to factory heater if installed.
    image.jpg
    And there are 2 in the water pump vs my original pump only had the larger one on the passenger side, which again is for the factory heater, if installed. Plus one in the front of the head. So what is the extra one in the water pump and head?
    image.jpg
    And finally, it looks like there is another one down low in the middle on the driver's side in line with the one for the oil pressure guage.
     
    mickeykelley, Mar 17, 2018
    #1
  2. PeteL

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

    PeteL, Mar 17, 2018
    #2
  3. Glenn

    Glenn Kinda grumpy old man Staff Member

    2nd picture you are correct about the heater assumption.
     
    Glenn, Mar 17, 2018
    #3
  4. william_cj3b

    william_cj3b 3BOB driver

    That's where the oil passage to the rocker arm stand was drilled at the factory.
    That's where the oil passage for the center camshaft bearing was drilled through the main oil galley.
     
    william_cj3b, Mar 17, 2018
    #4
  5. mickeykelley

    mickeykelley Well-Known Member

    'Drilled' meaning they had to drill from the outside just to get the passage but then plug where they had to do the drilling? Why not just use that hole with a 90 degree brass adapter instead of then having to drill and tap for the external oil line? Just trying to understand.
     
    mickeykelley, Mar 17, 2018
    #5
  6. Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Excellant question.

    My guess would be that the back of the head sits pretty close to the firewall, there may not be enough room there for the fitting. Definitely easier to get at on the top if you need to pull the head, remenber these things were built to be serviced.
     
    Howard Eisenhauer, Mar 17, 2018
    #6
  7. Glenn

    Glenn Kinda grumpy old man Staff Member

    Maybe they determined it was the best way to keep the oil pressure to the cam bearings equal.

    Scratch this answer, I misread the question.
     
    Glenn, Mar 17, 2018
    #7
  8. Glenn

    Glenn Kinda grumpy old man Staff Member

    This certainly makes sense, it is tight in that area.
     
    Glenn, Mar 17, 2018
    #8
  9. william_cj3b

    william_cj3b 3BOB driver

    Yep, most older engines have at least a couple of plugs like this. The f-head has more than most: three plugs on the side of the block for the camshaft passages, one one the head, two on the center main web for the oil pump passages and one at each end of the main oil galley (behind the cam gear and the rear plate). I probably forgot a couple.
     
    william_cj3b, Mar 17, 2018
    #9
  10. mickeykelley

    mickeykelley Well-Known Member

    I keep learning more. Thanks for the explanation. Keep them painted black and move on.
     
    mickeykelley, Mar 18, 2018
    #10