1. Welcome to 4Runners.com!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all 4Runner discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other 4Runner owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Skid Plate Bolts Stripped, Oversize Tap and Drill Bit?

Discussion in '5th Gen 4Runners (2010-2024)' started by Scotty4run, Apr 28, 2024.

  1. Apr 28, 2024 at 5:58 AM
    #1
    Scotty4run

    Scotty4run [OP] New Member

    Joined:
    Nov 3, 2022
    Member:
    #29397
    Messages:
    64
    Gender:
    Male
    I took my runner to a local shop for a service. Yes, they stripped 3 of 4 skid plate bolts. What size is the next bolt size larger? And what drill bit and tap will I need? New bolts don't thread in the stripped holes so I ran a tap through and it's ok for now. I am expecting the damaged threads to strip in the future so I want the next size up ready to go. So, what will I need to go one size larger? How long do the bolts need to be?

    Thank you!
     
    Last edited: Apr 28, 2024
  2. Apr 28, 2024 at 6:45 AM
    #2
    catbrown357

    catbrown357 New Member

    Joined:
    Dec 19, 2023
    Member:
    #37386
    Messages:
    793
    Gender:
    Male
    Tempe
    Vehicle:
    2011 Limited 4WD
    Take one out and head on down to your local Ace Hardware. They'll set you up.
     
  3. Apr 28, 2024 at 7:11 AM
    #3
    ljerr2

    ljerr2 New Member

    Joined:
    Jul 29, 2022
    Member:
    #28006
    Messages:
    79
    Gender:
    Male
    IOWA
    Vehicle:
    2023 T4R Pro
    You might want to consider a thread insert as an option, too. Heli-coil type inserts are stainless steel and should help with future potential corrosion and seizing issues. Plus is that you keep the stock size hardware.
     
  4. Apr 28, 2024 at 7:16 AM
    #4
    Higgbra73

    Higgbra73 Nitrous Fixes Everything

    Joined:
    Oct 7, 2023
    Member:
    #36039
    Messages:
    224
    Gender:
    Male
    First Name:
    Brad
    Chicago
    Vehicle:
    16' SR5 Premium 4WD
    Voxx "PRO's" Bronze (17x8.5) wrapped in 285/70-17 Mickey Thompson Baja Boss A/T's, 5100's with Dobinsons C59-302 2.5" front coils and Ironman 1.5" Light Load rear coils. RCI Engine Skid plate. CAT Shield SS. Freedom Offroad UCA's. 14" Borla Pro XS Muffler (40358)
    Funny this comes up, went to replace my stock skid with an RCI and the whole right side bolts were broke off. Now I had to buy a reverse bit set an attempt to un-F**k myself
     
  5. Apr 28, 2024 at 7:33 AM
    #5
    ljerr2

    ljerr2 New Member

    Joined:
    Jul 29, 2022
    Member:
    #28006
    Messages:
    79
    Gender:
    Male
    IOWA
    Vehicle:
    2023 T4R Pro
    Sucks man.......... a good left handed drill bit set may be your best friend. A good set of spiral extractors might be good to pickup while you're out! They work great if the LH bits don't do the trick for you. Hopefully your frame threads are ok.............
     
    Higgbra73[QUOTED] likes this.
  6. Apr 28, 2024 at 8:19 AM
    #6
    2ndGen22re

    2ndGen22re Goldie, my 1st love & my new kid…

    Joined:
    Mar 10, 2022
    Member:
    #26045
    Messages:
    1,013
    Gender:
    Male
    First Name:
    CR
    Carson Valley, NV
    Vehicle:
    1990 22RE & 22 AG ORP KDSS
    One-at-this-price stripper. Bought new 34 yrs ago, a $13K leftover. Added Detroit TruTrac, 1”rear spring spacer and “pinstripes”… Factory AC kit and roof rack bought at dealer cost at time of purchase, still blows ice cold 32yrs later. 2022 AG ORP all stock.
    Formula for tap drill sizes when you don’t have a chart handy.
    What ever the pitch is subtract it from the major diameter = tap drill size.
    In your case enlarging the M8 x 1.25 to
    M10 x 1.5 you subtract 1.5 from 10 = 8.5mm tap drill size.
    For SAE threads it is kinda the same.
    Example: 3/8-16
    Take the 16 and make it a fraction. 1/16th.
    Subtract 1/16” from 3/8” major diameter = 5/16” tap drill size.
     
    Manhattan and T in Texas like this.
  7. Apr 28, 2024 at 8:49 AM
    #7
    Scotty4run

    Scotty4run [OP] New Member

    Joined:
    Nov 3, 2022
    Member:
    #29397
    Messages:
    64
    Gender:
    Male
    Thank you!
     
    2ndGen22re[QUOTED] likes this.
  8. Apr 28, 2024 at 8:50 AM
    #8
    McSpazatron

    McSpazatron New Member

    Joined:
    Feb 16, 2021
    Member:
    #19810
    Messages:
    5,522
    Gender:
    Male
    Vehicle:
    2021 4runner OR
    Dobinson IMS Warn Bumper CaliRaised Sliders 285/70 K02s
    I love all these little nuggets of knowledge I run into when reading these threads. I’ll never remember them when I need them, but I love ‘em anyway.
     
  9. Apr 28, 2024 at 9:00 AM
    #9
    2ndGen22re

    2ndGen22re Goldie, my 1st love & my new kid…

    Joined:
    Mar 10, 2022
    Member:
    #26045
    Messages:
    1,013
    Gender:
    Male
    First Name:
    CR
    Carson Valley, NV
    Vehicle:
    1990 22RE & 22 AG ORP KDSS
    One-at-this-price stripper. Bought new 34 yrs ago, a $13K leftover. Added Detroit TruTrac, 1”rear spring spacer and “pinstripes”… Factory AC kit and roof rack bought at dealer cost at time of purchase, still blows ice cold 32yrs later. 2022 AG ORP all stock.
    I worked at a National Defense laboratory in a field support unit for a few years. Sometimes we would get called in to a secure area to put out a ‘fire’ and cell phones were restricted. I never knew exactly what needed to be done until we got in there and had no way of getting info off the web and it was a hassle to go back out/in again. I employed every trick I could. Even with my old dried out brain I manage to remember some of them.
     
    2Toys and McSpazatron[QUOTED] like this.
  10. Apr 28, 2024 at 12:40 PM
    #10
    3JOH22A

    3JOH22A トヨタ純正ジゴロ

    Joined:
    Dec 31, 2022
    Member:
    #30349
    Messages:
    2,263
    Gender:
    Male
    District 6ix
    Vehicle:
    5G 4Runner, 3G Tacoma on 35"s
    Count on the weld nuts on the frame to break eventually. Just open the holes up with a 7/16" drill bit and install M8 rivnuts: https://www.amazon.com/Stainless-Threaded-Insert-Nutsert-Rivnuts/dp/B07DK8JM6J/
     
  11. Apr 28, 2024 at 1:11 PM
    #11
    Higgbra73

    Higgbra73 Nitrous Fixes Everything

    Joined:
    Oct 7, 2023
    Member:
    #36039
    Messages:
    224
    Gender:
    Male
    First Name:
    Brad
    Chicago
    Vehicle:
    16' SR5 Premium 4WD
    Voxx "PRO's" Bronze (17x8.5) wrapped in 285/70-17 Mickey Thompson Baja Boss A/T's, 5100's with Dobinsons C59-302 2.5" front coils and Ironman 1.5" Light Load rear coils. RCI Engine Skid plate. CAT Shield SS. Freedom Offroad UCA's. 14" Borla Pro XS Muffler (40358)
    Well, time to watch Utube
    Never had to use LH bits or extractor before. Wish me luck?
     
    2ndGen22re likes this.
  12. Apr 28, 2024 at 4:43 PM
    #12
    2ndGen22re

    2ndGen22re Goldie, my 1st love & my new kid…

    Joined:
    Mar 10, 2022
    Member:
    #26045
    Messages:
    1,013
    Gender:
    Male
    First Name:
    CR
    Carson Valley, NV
    Vehicle:
    1990 22RE & 22 AG ORP KDSS
    One-at-this-price stripper. Bought new 34 yrs ago, a $13K leftover. Added Detroit TruTrac, 1”rear spring spacer and “pinstripes”… Factory AC kit and roof rack bought at dealer cost at time of purchase, still blows ice cold 32yrs later. 2022 AG ORP all stock.
    If you can, use a center punch and put a divot in CENTER as best you can, take your time.
    Start with the smallest bit and get it in the CENTER as best you can. Put the bit deep into the drill chuck so there is less flopping around when you put pressure on it.
    Then follow up with a larger bit, sometimes the larger bit will grab in the smaller hole and break loose the bolt.
    Use the largest extractor possible and try to put as little of a side load on it as possible.
    The extractors are very hard and brittle and if you break it off in the hole you will have a real problem…..ask me how I know…
    Myself, I really don’t like extractors, LH bits yes.
    I am fortunate to have a mig welder and I place a nut over the remains of the broken bolt and weld through the nut hole and onto the nut.
    This gives you something to turn with and the heat from welding seems to help loosen the broken bolt, especially if corrosion is involved.
    If the bolt hole isn’t corroded the LH bits wil probably get it out without rolling the dice with an extractor.
    Remember….CENTER !
     
    Last edited: Apr 28, 2024
    2Toys likes this.
  13. Apr 29, 2024 at 4:32 AM
    #13
    Higgbra73

    Higgbra73 Nitrous Fixes Everything

    Joined:
    Oct 7, 2023
    Member:
    #36039
    Messages:
    224
    Gender:
    Male
    First Name:
    Brad
    Chicago
    Vehicle:
    16' SR5 Premium 4WD
    Voxx "PRO's" Bronze (17x8.5) wrapped in 285/70-17 Mickey Thompson Baja Boss A/T's, 5100's with Dobinsons C59-302 2.5" front coils and Ironman 1.5" Light Load rear coils. RCI Engine Skid plate. CAT Shield SS. Freedom Offroad UCA's. 14" Borla Pro XS Muffler (40358)
    Copy that…
    Thanks for the assist
    Will get around to it prob next weekend. I’ll Post some pics if I remember. But yes… it’s from corrosion. Never had to deal with the shit living in San Diego for 37yrs
     
    2ndGen22re[QUOTED] likes this.
  14. Apr 29, 2024 at 5:19 AM
    #14
    Manhattan

    Manhattan New Member

    Joined:
    Feb 18, 2024
    Member:
    #38590
    Messages:
    267
    Gender:
    Male
    You're the guy we all want with us on the trail when something breaks!
     
    2ndGen22re[QUOTED] and 2Toys like this.
  15. May 4, 2024 at 12:03 PM
    #15
    Higgbra73

    Higgbra73 Nitrous Fixes Everything

    Joined:
    Oct 7, 2023
    Member:
    #36039
    Messages:
    224
    Gender:
    Male
    First Name:
    Brad
    Chicago
    Vehicle:
    16' SR5 Premium 4WD
    Voxx "PRO's" Bronze (17x8.5) wrapped in 285/70-17 Mickey Thompson Baja Boss A/T's, 5100's with Dobinsons C59-302 2.5" front coils and Ironman 1.5" Light Load rear coils. RCI Engine Skid plate. CAT Shield SS. Freedom Offroad UCA's. 14" Borla Pro XS Muffler (40358)
    SUCCESS… well 2 of the 3 are done on right side… ran out of time, lady was on my ASS. So it’s pretty secure now. Thanks Again dude!
     
    2ndGen22re[QUOTED] likes this.
  16. May 4, 2024 at 1:07 PM
    #16
    2ndGen22re

    2ndGen22re Goldie, my 1st love & my new kid…

    Joined:
    Mar 10, 2022
    Member:
    #26045
    Messages:
    1,013
    Gender:
    Male
    First Name:
    CR
    Carson Valley, NV
    Vehicle:
    1990 22RE & 22 AG ORP KDSS
    One-at-this-price stripper. Bought new 34 yrs ago, a $13K leftover. Added Detroit TruTrac, 1”rear spring spacer and “pinstripes”… Factory AC kit and roof rack bought at dealer cost at time of purchase, still blows ice cold 32yrs later. 2022 AG ORP all stock.
    Great job! Really glad it is working.
    Being married isn’t for the timid…….
     
    Higgbra73[QUOTED] likes this.
  17. May 5, 2024 at 3:58 PM
    #17
    Greg D

    Greg D New Member

    Joined:
    Aug 6, 2019
    Member:
    #10809
    Messages:
    765
    Gender:
    Male
    First Name:
    Greg
    Vehicle:
    2013 4runner
    Borla exhaust, Jet MAF sensor, K&N filter, Hayden rapid cool transmission cooler, Hella horns, electric fan, Pedal Commander, Derale power steering cooler,
    Next size SAE will work sometimes
     

Products Discussed in

To Top