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Front diff fill bolt seized

Discussion in 'Heavy Duty' started by Richard Kim, May 15, 2020.

  1. Richard Kim

    Richard Kim Member

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    Any suggestions? I nearly threw out my back trying to loosen the fill bolt on my front diff (2016 so American Axle). Lefty loosey righty tighty correct? About to put a jack to it. Any help or suggestions would be greatly appreciated.
     
  2. GsRAM

    GsRAM Senior Member

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    So long as your turning it the correct way, I'd soak it with PB Blaster, let it sit overnight, spray it again and then try it.

    If it still won't move put some heat on it but be careful of surrounding components.
     
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  3. crazy jerry

    crazy jerry Senior Member

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    i think the bolt is around 25ftlb then they paint over the top of it so thats part of why its hard to loosen. use a longer 1/2 in ratchet with 3/8 adapter.
     
  4. Richard Kim

    Richard Kim Member

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    Appreciate the suggestions. Will get some PB. The bolt direction is normal (left = loose) correct?
     
  5. csuder99

    csuder99 Senior Member

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    Yes it's regular thread. I never liked the left/right analogy as there are many ways that can screw (pun intended) you, e.g. when the bolt or nut is facing away from you.
     
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  6. Gr8bawana

    Gr8bawana Senior Member

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    Isn't the backside of the fill plug soaked with gear oil all the time? Doesn't seem like it could be rusted in place.
     
  7. SeppW

    SeppW Junior Member

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    1/2 or better breaker bar. Right-handed threads.
     
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  8. RandomRam

    RandomRam Senior Member

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    Hit it with a torch for a few seconds. Nothing crazy, one of those propane torches will do nicely. Used that on broken intake manifold bolts on a Chevy 350.
     
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  9. IRSmart

    IRSmart I drink and I know things

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    Life lesson, keep a 3 foot pipe around at all times. I picked one up from Home Depot for about $8. It’s just big enough that it slips over my 3/8” socket, turning it into a huge breaker bar. I call it “the bar of encouragement” lol
     
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  10. crazy jerry

    crazy jerry Senior Member

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    pb wont even get to the threads because like i said it probly has thick paint over everything and the bolt head is sealed against the cover with a gasket. besides the bolt isnt rusted anyways, its just tight from the factory. heat on the bolt is useless as you dont want it to expand and youll just melt the rubber washer behind the bolt head. heat on the cover likely would melt the bolt gasket as well. put the sissy 3/8 ratchet away and get a long 1/2" and use some huevos
     
    Last edited: May 17, 2020
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