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header/downpipe flange bolts...

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  • header/downpipe flange bolts...

    After a trip last weekend it sounded like I'd cracked another exhaust manifold. got out the flashlight to find the crack/leak and discovered that I'd lost the nuts off the bolts holding the header and downpipe together, musta been coming loose a long time.

    I had some 3/8ths 20 grade 8 nuts and bolts handy so I installed 'em.

    Is there a certain grade bolt that should be used for this application due to the heat considerations??? Really the question is... anything wrong with using grade 8 here???:confused:

    thx,

    Brian.
    myJeeprocks.com

    "in the end... the rocks always win."

  • #2
    I use regular grade 2 bolts (the cheapies). I doubt there would be any problem with grade 8's.
    1994 Toyota, dual cases, 5.29 axles with ARB's

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    • #3
      You could try deformed thread lock nuts.

      The 3/8 fine thread should resist vibration as well.

      3/8s come in 16 or 24 tpi. 20 sounds like Brian engineering to me
      Last edited by aston; 05-14-06, 08:40 PM.
      "your jeep looks so hot!!"

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      • #4
        I was looking through a bunch of hardware, maybe the 20 was from something else... it was fine regardless. :yay:
        Last edited by blkTJ; 05-14-06, 10:14 PM.
        myJeeprocks.com

        "in the end... the rocks always win."

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        • #5
          Al, I was thinkin' maybe the "softer" grades would give more with temp changes making them a better choice. I guess I'll leave the stuff in there and see what happens.
          myJeeprocks.com

          "in the end... the rocks always win."

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          • #6
            Hey whats another repair right ? That's what having these jeeps is all about wheeling and then fixing right ?
            :wink:

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