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Exhaust Studs ?

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

  1. Apr 8, 2018
    mickeykelley

    mickeykelley Well-Known Member

    Republic of Texas
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    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?
     
  2. Apr 8, 2018
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Tantallon, Nova...
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    By the other end you mean where the pipe attaches to the manifold?
     
  3. Apr 8, 2018
    mickeykelley

    mickeykelley Well-Known Member

    Republic of Texas
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  4. Apr 8, 2018
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    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.
     
  5. Apr 8, 2018
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    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.
     
  6. Apr 9, 2018
    Rick Whitson

    Rick Whitson Detroit Area 2024 Sponsor 2022 Sponsor

    I live South of...
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    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.
     
    dozerjim likes this.
  7. Apr 10, 2018
    Slavcj

    Slavcj New Member

    Illinois
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    Course thread are almost always what are used in cast components. It's that way on every thing I have ever worked on.
     
    Rick Whitson likes this.
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