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Hot Rods Murphy Head welding cast iron ?

Discussion in 'The Hokey Ass Message Board' started by rexrogers, Mar 3, 2018.

  1. rexrogers
    Joined: Sep 18, 2007
    Posts: 1,033

    rexrogers
    ALLIANCE MEMBER

    We are working on a Murphy overhead conversion and the head has a few cracks that need attention and some previous repairs that need cleaned up as well.
    I don't have access to an oven to preheat and post heat the head and with the rarity of this head i would like to get it done correctly. Does anyone know or a reputable company that can perform the repairs?
    20180303_103512.jpg 20180303_103539.jpg 20180303_103549.jpg 20180303_103603.jpg 20180303_103611.jpg 20180303_103718.jpg
     
    kidcampbell71 likes this.
  2. manyolcars
    Joined: Mar 30, 2001
    Posts: 7,789

    manyolcars

    get someone with a Henrob to weld it. No pre or postheating neccessary. Its an easy weld and I've never had a failure using a Henrob
     
  3. rexrogers
    Joined: Sep 18, 2007
    Posts: 1,033

    rexrogers
    ALLIANCE MEMBER

    Thanks, I have a henrob, mainly just use it for gas welding aluminum and cutting. I have never tried using it for cast parts before. I don't think I will practice on this head but now it's on my list of things to do. I have a exhaust manifold that needs some attention.

    Sent from my SM-G930V using The H.A.M.B. mobile app
     
  4. LM14
    Joined: Dec 18, 2009
    Posts: 1,687

    LM14
    Member
    from Iowa

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  5. manyolcars
    Joined: Mar 30, 2001
    Posts: 7,789

    manyolcars

    The reason I bought the Henrob is to weld cast iron. Its very easy and I've never had any problem doing the weld. Use the Peteresen No 2 flux and heat the work until it begans to glow gold and start feeding the filler rod in. It turns into butter but never drips out. Easy, Amazing. You can drill and tap holes too
     
  6. G-son
    Joined: Dec 19, 2012
    Posts: 546

    G-son
    Member
    from Sweden

    While you can get away w/o pre/post heat on many welds, the type of welder you use does not change the nature of the metal you are welding. Cast iron cracks easily under tension, and if the weld is in a place that can not shrink freely as it cools down there will be tension in the metal - that's why "complicated" cast iron items need preheat, the area around the weld needs to shrink along with the weld as it all cools down slowly.

    The cracks in the first picture can probably be welded pretty well w/o preheat, looks like a corner that can "move" relatively free, other cracks "in the middle" of the head is a diffrent matter.

    And besides... With a rare (and valuable?) part, I'd always go the safer route, pre/post heat reduces the risk of problems and when you won't get a second chance any risk reduction is a good thing.
     
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  7. Hnstray
    Joined: Aug 23, 2009
    Posts: 10,602

    Hnstray
    ALLIANCE MEMBER
    from Quincy, IL

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  8. Jimbo17
    Joined: Aug 19, 2008
    Posts: 3,532

    Jimbo17
    Member

    Question can this type of weld be done with the engine still in the car?
    The outside threaded hole for a 350 that the starter motor bolts into cracked and just wondering it the engine needs to come out first or it can be welded with the engine in the car.

    Jimbo
     
  9. manyolcars
    Joined: Mar 30, 2001
    Posts: 7,789

    manyolcars

    Sorry but thats WRONG. The Henrob needs no pre or post heat. I have been doing this successfully for about 15 years. Since you havent used a Henrob, dont spread wrong information.
     
  10. manyolcars
    Joined: Mar 30, 2001
    Posts: 7,789

    manyolcars

    Maybe pre-heat needs to be defined. I think of pre-heat as something similar to putting a cast iron cylinder head on a burner, like a stove top and bringing up the temperature of the entire head. I dont do anything remotely close to that.
    I do wave the torch over the head for 5 seconds or so but thats not pre-heat. When I finish the weld, I turn off the torch and walk away. Absolutely no post heat at all and I've never had a failure.
    This is according to the instructions that come with the torch. I cant argue with success. The Henrob has changed named several times to Cobra, Dillon and Detroit torch. https://detroittorch.com/
     
  11. Rusty O'Toole
    Joined: Sep 17, 2006
    Posts: 8,979

    Rusty O'Toole
    Member

    This may be a good place for a Lock n Stitch repair. Stronger than welding and doesn't cause stress or warpage. Let Jay Leno explain.
     
  12. G-son
    Joined: Dec 19, 2012
    Posts: 546

    G-son
    Member
    from Sweden

    Take a look at my profile picture on the left.
     
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  13. rexrogers
    Joined: Sep 18, 2007
    Posts: 1,033

    rexrogers
    ALLIANCE MEMBER

    I sometimes forget what all the Henrob is capable of, I use it for gas welding aluminum, but last week I cut some 1/2" plate like butter with it.
    The head has one long crack on the back side that was drilled and pinned.
    I think I will make few phone calls on Monday and talk with a few of the companies that do head repair.
    Need to do a little clean up work on the head with the fair amount of cracks I'm starting to wonder about the quality of the casting to begin with.

    Sent from my SM-G930V using The H.A.M.B. mobile app
     
  14. sunbeam
    Joined: Oct 22, 2010
    Posts: 4,217

    sunbeam
    Member

    If you can't find anyone closer I have used Cylinder head repair in Wichita Ks with good success.
     
  15. rexrogers
    Joined: Sep 18, 2007
    Posts: 1,033

    rexrogers
    ALLIANCE MEMBER

    We sent the head out to Midwest cylinder head, they passed on attempting the repairs. We might have to selve that idea for now. There is a Joe Gemsa head that might replace the Murphy banger.

    Sent from my SM-G930V using The H.A.M.B. mobile app
     
  16. LM14
    Joined: Dec 18, 2009
    Posts: 1,687

    LM14
    Member
    from Iowa

    I've seen Midwest pass on very few items. That really surprises me but they know their limits. Sorry to hear the outcome.
    SPark
     
  17. dirty old man
    Joined: Feb 2, 2008
    Posts: 8,152

    dirty old man
    ALLIANCE MEMBER

  18. winduptoy
    Joined: Feb 19, 2013
    Posts: 1,540

    winduptoy
    ALLIANCE MEMBER

    They may have passed due to the previous repairs that have been performed. That is a variable that can make additional repairs complex or impossible to successfully complete.
    Mrs. Murphy may have stepped in on this one
    Let us know which way it winds up. Either way would be cool.
    Larry
     
  19. 1946caddy
    Joined: Dec 18, 2013
    Posts: 1,475

    1946caddy
    Member
    from washington

    This guy says pre heating thick aluminum is critical;
     
    Hnstray likes this.
  20. Pete Eastwood
    Joined: Jul 27, 2011
    Posts: 787

    Pete Eastwood
    Member
    from california

    This head looks like it's had a ton milled off of it, removing most of the head gasket surface & exposing the water jacks in the head !
     

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