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Care required using gas axe

Discussion in 'Safety Issues' started by Nige, Oct 21, 2018.

  1. Jonas302

    Jonas302 Senior Member

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    I have seen it happen to ball joints on a pickup also maybe the melted plastic forms a new very tight seal as its expanding ?
     
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  2. Truck Shop

    Truck Shop Senior Member

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    My guess is the joint was heated up real good the innards melted causing pressure no-doubt, not the first time I've seen that. Stopped a young fellow some years
    ago from cutting a sodium filled exhaust valve in two. Makes you wonder how many people injured heating stuck u-joints/using a bottle jack as a press.

    Truck Shop
     
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  3. Truck Shop

    Truck Shop Senior Member

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    What I don't understand is why a torch is used to remove tie-rod ends and drag links.

    Truck Shop
     
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  4. Nige

    Nige Senior Member

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    I think 92U 3046 in post #5 on Page 1 touched on something ........... JLG's horniness for half a bottle of Loctite on those specific threads......

    I haven't checked but apparently the Service Manual instructs to heat the rods attaching to both ends of the knuckle to break the threads loose. I'll have to read the procedure in detail
     
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  5. Vetech63

    Vetech63 Senior Member

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    EXACTLY! I haven't done one yet that wasn't a total bitch. LOL
     
  6. Truck Shop

    Truck Shop Senior Member

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    Actually I was referring to steering components as in large tie rod ends and drag links stated in some of the posts above.

    Truck Shop
     
  7. petepilot

    petepilot Senior Member

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    if locktite is involved 4 to 600 degrees does the trick
     
  8. repowerguy

    repowerguy Senior Member

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    Concrete slurry works it's way into everything, that and the acidic cleaners lock threaded fasteners up tight. Most guys went for the heat to loosen drag links and tie rod ends from the tube they were screwed in to. I used ATF and acetone with a 12oz hammer to loosen them however.
     
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  9. Nige

    Nige Senior Member

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    Here's the Dana axle Service Manual procedure. Personally I don't think heating to 100 DegC would be enough to break a Loctite bond on the threads.
    And that procedure looks all fine and dandy with the axle out of the machine and in a holding fixture, I'd like to see them do it like that with the axle still in place ...........

    upload_2018-10-26_6-47-17.png
     
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  10. DMiller

    DMiller Senior Member

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    Typical service manual where it is OUT of the machine and in the open. Have always used heat on similar stubborn threaded bustards but not to blacksmith levels of heat just enough to break down the Loctite or bonding materials, would never have considered a explosive effort as shown.
     
  11. Hobbytime

    Hobbytime Senior Member

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    I wonder if someone( dumbass) pumped some substance ( an epoxy or similar)inside of the worn joint trying to get some more time out of it before replacing it??? and that hardened and made a seal that kept in heated gases to cause what the pictures show....I have replaced ball joints like that on the front of a john deere tractor, but wrenches got them off and no heat needed, but this brings new cautions to heating a grease filled ball joint..
     
  12. Nige

    Nige Senior Member

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    Well no real concrete conclusions, but it sounds like far too much heat was used, plus the heat was applied mainly to the ball joint not the cylinder rod. Sometimes I wonder if certain people should have a "not permitted to work without adult supervision" tag hung round their necks.
     
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  13. DMiller

    DMiller Senior Member

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    Some need that tattooed to their forehead!
     
  14. Nige

    Nige Senior Member

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    Kinda "Here's your sign" deal, right..?
    upload_2018-11-5_13-14-2.png
     
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  15. old-iron-habit

    old-iron-habit Senior Member

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    Thanks for posting this Nige. You prompted my memory. A number of years ago we had this very topic featured in a safety seminar after a company mechanic narrowly escaped serious injury. He was using a cutting torch heating/cutting a frozen u-joint next to a carrier bearing on a loader. It had enough force to severely damage a nearby hydraulic hose when it exploded. He was lucky that he was reaching in and the machine shielded his body. His arm got some bounced shrapnel and a finger got smoked thru a leather glove. They then showed us a dozen examples where people were injured or killed on everything from mine trucks, to exploded PTO drive links, to a exploded propeller on a outboard motor. All from using to much heat on them. May not happen often but if the conditions are right it does happen.
     
  16. kshansen

    kshansen Senior Member

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    Wish I could find the actual report but a couple years before I retired some guys at a different part of the company had a incident related to heating to remove an impeller on a water pump.

    As I recall this water pump had an impeller that screwed on to the shaft and the threaded hole was a blind hole! After not having any luck breaking the impeller free they decided to grab the gas-axe. Not sure if there was water, oil or something else inside the threaded hole but while heating the center of the impeller exploded out. I can imagine that it is possible someone had installed the impeller with grease or ani-sieze and that is what caused the explosion. Do not recall if there were any injuries or worse.
     
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  17. old-iron-habit

    old-iron-habit Senior Member

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    How that you mention it, I believe there is a post here somewhere that details that incident.
     
  18. Nige

    Nige Senior Member

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    Not post #15 on Page 1 that you're referring to is it..?
     
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  19. kshansen

    kshansen Senior Member

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    Don't think that was the same accident as I'm pretty sure the one I was referring to was a water pump that one refers to a propeller, I'm thinking that means a boat, not an impeller on a pump. But still same idea.
     
  20. kshansen

    kshansen Senior Member

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    Well the search function for this forum is a great tool. Just did a search for my name and searched for "impeller" and there it was:
     
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