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Exhaust Studs ?

Discussion in 'Early CJ5 and CJ6 Tech' started by mickeykelley, Apr 8, 2018.

  1. mickeykelley

    mickeykelley Well-Known Member

    On my 58 F134 the exhaust manifold is attached with studs but the head side is coarse thread and the nut side is standard. However, in the other end of the manifold, the factory stud is coarse on both sides. I'm pretty sure it's all original. Is there a reason for this?
     
    mickeykelley, Apr 8, 2018
    #1
  2. Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    By the other end you mean where the pipe attaches to the manifold?
     
    Howard Eisenhauer, Apr 8, 2018
    #2
  3. mickeykelley

    mickeykelley Well-Known Member

    Yes
     
    mickeykelley, Apr 8, 2018
    #3
  4. Glenn

    Glenn Kinda grumpy old man Staff Member

    FWIW the wagon parts book shows that stud for the F-head is coarse on both ends like yours is. As to why the head side uses fine threads.....I'll throw out the thought of it being easier to tighten fine thread fasteners more precisely which would be necessary for a cast iron manifold to the block situation.
     
    Glenn, Apr 8, 2018
    #4
  5. timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    The studs with USS (coarse) and SAE (fine) on opposite ends are common. Not sure why they would be designed that way. Seems like exhaust studs (at the pipe) are typically coarse on both ends.
     
    timgr, Apr 8, 2018
    #5
  6. Rick Whitson

    Rick Whitson Detroit Area 2024 Sponsor 2022 Sponsor

    Mine were like Tim said, course in the block and fine on the manifold side, I got fine thread brass nuts for it at Lowes.
     
    Rick Whitson, Apr 9, 2018
    #6
    dozerjim likes this.
  7. Slavcj

    Slavcj New Member

    Course thread are almost always what are used in cast components. It's that way on every thing I have ever worked on.
     
    Slavcj, Apr 10, 2018
    #7
    Rick Whitson likes this.