HV Nut Removal when STUCK

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Hitech51, Mar 26, 2021.

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  1. Hitech51

    Hitech51 Junior Member

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    Got the HV battery out to recondition it ...but... 14 Nuts will not come loose from the battery modules....
    Tried 3 sockets and even ground down one to make it fit better but no go...
    Tried vise grips, and unfreezing liquid spray, etc....
    Any suggestions ???
     
    #1 Hitech51, Mar 26, 2021
    Last edited: Mar 26, 2021
  2. tankyuong

    tankyuong Senior Member

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    Drill out
     
    #2 tankyuong, Mar 26, 2021
  3. Hitech51

    Hitech51 Junior Member

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    Drill out a nut that is connected to the bolt going into the plastic battery module ??? Explain ?
     
    #3 Hitech51, Mar 26, 2021
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  4. RRxing

    RRxing Senior Member

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    See if this helps:
     
    #4 RRxing, Mar 27, 2021
  5. fotomoto

    fotomoto Senior Member

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    Yes, I would take that as yet another (14) sign(s) it's time for a new battery.
     
    #5 fotomoto, Mar 27, 2021
  6. sam spade 2

    sam spade 2 Senior Member

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    A "light duty" impact tool might help a lot.
    Giving it a few shots in BOTH directions will often break them loose.

    There is a "nut breaker" device that can be quite useful but not in a tight space like the picture shows.
     
    #6 sam spade 2, Mar 27, 2021
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  7. mr_guy_mann

    mr_guy_mann Senior Member

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    Option 1: use a small cut off wheel on a dremel tool to slice away part of the nut then use vice grips to break what's left.
    Option 2: replace the battery- get a used pack and recondition that

    Posted via the PriusChat mobile app.
     
    #7 mr_guy_mann, Mar 27, 2021
  8. TMR-JWAP

    TMR-JWAP Senior Member

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    14 nuts on a 2013 HV battery will not come loose? Is this a previously repaired/worked on battery?
     
    #8 TMR-JWAP, Mar 27, 2021
  9. Hitech51

    Hitech51 Junior Member

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    Yes, it was taken apart as to nuts and the bars, cleaned and greased. Dr prius suggested replacement of a few modules but we want to cycle them first to see the real capacity of each. the voltage is btw 7.8 and 7.85 for each at this time....
    Broke one socket tool set from HomeDepot and now ready to try the one from AutoZone.... Lastly will cut a crease in the nut....
     
    #9 Hitech51, Mar 29, 2021
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