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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          • bandit67

            bandit67 FBBO Gold Member FBBO Gold Member

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            Ok, I found a "reducing stud" , 7/16-14 by 3/8-24 the same length as stock studs. The drill for the 7/16 is a "W", which is just a few thousandths different from whats needed for a Time Sert . The Time Sert 3/8 kit is $80 bucks. I am thinking that in using the reducing stud would eliminate one possible source for a coolant leak. Two sources with the Sert verses only one with the stud. What would you do.

            IMG_0252.jpg IMG_0252.jpg
             
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            • 69Bee

              69Bee FBBO Gold Member FBBO Gold Member

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              Without a question, the time-Sert, but I guess I am biased towards fixing it correctly. There are NO leak paths with a Time-Sert when installed correctly. If you are concerned, just use a little red Loc-Tite on the insert. On the upside, you have the ability to fix any 3/8"-16 bolt hole on your stuff from now on.
               
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              • Durandal25

                Durandal25 FBBO Gold Member FBBO Gold Member

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                Butter that sucker with aviation gasket sealer. Let her sit for a week, and boom goes the dynamite.
                 
              • 69Bee

                69Bee FBBO Gold Member FBBO Gold Member

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                All I can say is good luck. I used Permatex #2 non hardening sealer, ARP Teflon thread sealer, etc and nothing worked.

                ps.. I repair a LOT of threads, right Jim... :thumbsup:
                 
              • bandit67

                bandit67 FBBO Gold Member FBBO Gold Member

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                My Time Sert kit arrived today and it was real simple to get insert and stud installed. Got it sealed and feel it went well and hopefully no problems down the road. Waiting on new oil pan from 440 source and then will oil prime the motor. Got an engine run stand that hopefully can be modified for the 440 and then do the cam break in run. thanks all....
                 
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