Need exhaust manifold stud for repair.....

Mopar Exhaust Systems

  1. bandit67

    bandit67 FBBO Gold Member FBBO Gold Member

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    Guys, my machinist kinda left me hanging on this one. Took in a set of bb heads for rework and ask him to repair a broken off exhaust stud , one on the end in the water jacket. He only drilled out the broken stud.Loading up everything I forgot to check, so just found it on assembly day. So, do they make an one sided oversize stud, maybe something like a 7/16 by 3/8 fine thread. I am concerned putting in a heli coil with a stock size stud may be hard to prevent a coolant leak. Want to fix this now before getting the engine in the car. thanks....
     
  2. yella71

    yella71 Well-Known Member

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    Heli coil is the best repair. Do it then put a stud in like you would any other bb head with a little sealer. Done.
     
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    • fast69mopar

      fast69mopar Member

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      I second this repair. This is exactly how I repair the threads that protrude into a water jacket. If you really want to get fancy install a Time Sert and sealer and it will be the last thread repair for that hole ever unless you bugger it up again.
       
    • 747mopar

      747mopar FBBO Gold Member FBBO Gold Member

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      A heli coil should seal up alright, if your really against it then check out McMaster Kart, should be able to find an adapter stud to take care of it.
       
    • 69 Sleeper Bee

      69 Sleeper Bee Well-Known Member

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      My machinist put a heli coil in mine and said be sure to use a good sealer for the stud. This is very common.
       
    • 69Bee

      69Bee FBBO Gold Member FBBO Gold Member

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      I am here to tell you that the likelihood of a "Heli-Coil" sealing a stud into a water-jacket is NIL. The problem is that there are too many leak paths with the Heli-Coil. I have tried this route a few times (3 for me), and they wouldn't stop leaking. I have since gone to using Time-Serts regularly. I would recommend either a regular Time-Sert, or if the hole they drilled is too large, a Big-Sert. The Big-Sert is designed to repair a hole that is larger than it should be to go back to the original size. If a Time-Sert gets damaged, they can be drilled to remove the tension holding it in place, removed, and a new Time-Sert installed.
       
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      • bandit67

        bandit67 FBBO Gold Member FBBO Gold Member

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        I am looking into these Time Serts. I have put in several heli coils from a kit purchased and had great results .....but not in a water jacket. It just appears way to pourus to hold back pressurized hot coolant to me....even with the best sealant I could find. Will check with my NAPA store here first before I order some online. The drill needed for a 3/8 is a 21/64 and it appeared my machinest used a bit two sizes bigger. Is the drill size needed for the TimeSerts the same used for heli coils or bigger.....thanks....
         
      • 69Bee

        69Bee FBBO Gold Member FBBO Gold Member

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        • 69Bee

          69Bee FBBO Gold Member FBBO Gold Member

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        • 69Bee

          69Bee FBBO Gold Member FBBO Gold Member

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        • Photon440

          Photon440 FBBO Gold Member FBBO Gold Member

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          Somebody must make them - it's not uncommon in the metric world, they're called reducing studs. Maybe you need to make your own on a mini lathe. s-l300.jpg
           
        • 1 Wild R/T

          1 Wild R/T FBBO Gold Member FBBO Gold Member

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