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  • 2 Post By firebird77clone
  • 1 Post By DennyW

Thread: Finding metal pieces in the differential plug?
          
   
   

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  1. #1
    testdepth is offline CHR Member Visit my Photo Gallery
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    Finding metal pieces in the differential plug?

     



    This truck ran fine with no noise coming from the 9 inch Ford rear end. Sounds great and runs great.

    I drained the differential and removed the plug. Inside the hollow of the plug I just found these 2 little pieces of metal. They almost look like a roll pin cut in half? I have no idea what these are or where they could have come from.
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  2. #2
    DennyW is offline CHR Member Visit my Photo Gallery
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    That is a broken roll pin.

  3. #3
    firebird77clone's Avatar
    firebird77clone is offline CHR Member Visit my Photo Gallery
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    Definitely two pieces of roll pin, but I wouldn't assume it's a single pin sheared in half. Could be the ends from two pins. Either tear down and investigate else considering it runs fine, quiet and whatnot... don't.

    I'm thinking those are your options.
    glennsexton and testdepth like this.
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    Education is expensive. Keep that in mind, and you'll never be terribly upset when a project goes awry.
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  4. #4
    testdepth is offline CHR Member Visit my Photo Gallery
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    Is this where these pieces came from and how difficult is it to fix?
    Last edited by testdepth; 01-21-2019 at 07:48 PM.

  5. #5
    DennyW is offline CHR Member Visit my Photo Gallery
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    The pinion shafts are held in place with roll pins, knocked out from behind. You simply use a punch, just like in the picture laying there.


    Read through the article.
    Ford 9-Inch Rebuild for Pennies on the Dollar


    Roll pins usually break from extreme force. Like pedal to the metal, and pop that clutch, from a dead stop. Or some wear causing a little looseness.
    A lot of miles on the gears, or not adjusted correctly.
    Last edited by DennyW; 01-21-2019 at 09:04 PM.

  6. #6
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    Driver50x is offline CHR Member Visit my Photo Gallery
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    On my race cars, I always used a magnetic drain plug. At least that would retain any small pieces of metal such as that, and prevent it from recirculating through the gears over and over.
    Steve

  7. #7
    testdepth is offline CHR Member Visit my Photo Gallery
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    I just popped the differential out of the housing and found the rest of the two broken pieces laying in the bottom.

    What can I soak this differential in to get it clean so I can look at damage if any? The truck ran fine before tear down and made no strange noises FWD or REV.
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  8. #8
    DennyW is offline CHR Member Visit my Photo Gallery
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    You have 2 broken roll pins. If the third one breaks, you will then hear lots of noise. If your not setup to clean things. Brake clean spray works fine. How ever, to really check things, it needs to be disassembled.
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  9. #9
    testdepth is offline CHR Member Visit my Photo Gallery
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    Is there a video on here or somewhere else that shows disassembly? How to install the pin and roll pins? I can't find one.

    It looks like the cross pin rotated and broke both roll pins that hold it in place off. One pin left holding everything together. May just have gotten lucky?

  10. #10
    testdepth is offline CHR Member Visit my Photo Gallery
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    It looks like the carrier housing is shot? The third roll pin looks like it was getting ready to go and the cross pin was wobbling around in the hole.
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    Last edited by testdepth; 01-28-2019 at 04:09 PM.

  11. #11
    firebird77clone's Avatar
    firebird77clone is offline CHR Member Visit my Photo Gallery
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    Looks like you found it just in time.

    Roll pins install with a big hammer and a punch. Easy.

    It might be necessary to drill out the holes to the next size pin, if the holes are wallowed out.
    Last edited by firebird77clone; 01-28-2019 at 08:54 PM.
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    Education is expensive. Keep that in mind, and you'll never be terribly upset when a project goes awry.
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  12. #12
    testdepth is offline CHR Member Visit my Photo Gallery
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    I'll find out when I get home but I think the carrier is toast.

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