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Bolt size for pre-threaded under-hood fender mount points?

Discussion in '3rd Gen. Tacomas (2016+)' started by vtstouff, Apr 26, 2017.

  1. Apr 26, 2017 at 8:54 AM
    #1
    vtstouff

    vtstouff [OP] Member

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    I'd like to install an OBA (CKMA12) under the hood on the passenger side close to the firewall. In my 3rd gen TRD OF (DCSB), I don't have any components there but I have two threaded holes in the fender side and 3 threaded holds below (straight down).

    I have searched this forum for different build threads or install threads the might list the size of the bolts used to mount things into these points (maybe I suck at the TW search). I know there is a bracket I can buy that fits this area (single or twin compressor), but at $125, I'd prefer to see what I can fashion myself.

    Several threads mention putting a rubber gasket or rubber feet between the compressor and the mount (which sounds like a good idea) and others mention fashioning their mount out of polycarbonate from Lowe's/Home Depot, but I didn't see anything about the hardware used to mount these home-grown brackets.

    Thoughts? I'm heading out Sunday on a trip and I'll have the compressor tomorrow so I'd like to try and squeeze in the install on Friday/Saturday if I can figure this out fairly easily.
     
  2. Apr 26, 2017 at 9:16 AM
    #2
    Nail

    Nail Well-Known Member

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    I know the two threaded bolt holes on the drivers side over the wheel well (right behind the battery ground) are M8-1.25 x 30. If those look close to the holes you are talking about then I bet they are the same size.
     
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  3. Apr 26, 2017 at 9:22 AM
    #3
    vtstouff

    vtstouff [OP] Member

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    Exactly! Thanks!
     
  4. Apr 26, 2017 at 9:24 AM
    #4
    vtstouff

    vtstouff [OP] Member

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    Sorry I didn't have pics to make it more clear but I'm traveling. I'll add pics when I get home in case others have a similar question.
     
  5. Apr 26, 2017 at 10:20 AM
    #5
    Simpleton

    Simpleton Well-Known Member

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    They are not the same as the driver side. I believe they were M6 when i checked.
     
  6. Apr 26, 2017 at 10:45 AM
    #6
    Simpleton

    Simpleton Well-Known Member

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    Confirmed.

    M8 x 1.25 on driver side.

    M6 x 1.0 on passenger
    20170426_104007.jpg 20170426_104140.jpg
     
    Last edited: Apr 26, 2017
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  7. Apr 26, 2017 at 10:46 AM
    #7
    tomwil

    tomwil Well-Known Member

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    Those things have helped me out numerous times.

    [​IMG]
     
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  8. Apr 26, 2017 at 11:12 AM
    #8
    Simpleton

    Simpleton Well-Known Member

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    Saves you from a real headache almost every time.
     
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  9. Apr 26, 2017 at 10:29 PM
    #9
    vtstouff

    vtstouff [OP] Member

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    Yes, I tried the M8 on the passenger side when I got home and it didn't fit so I grabbed an old M6 x 1.0 to try and that 1.0 seemed incorrect. But it could have been paint or something in there. I definitely wasn't trying to force it since I didn't have that handy ring of thread sizes. Thanks to you all!
     
  10. Apr 27, 2017 at 9:31 AM
    #10
    Simpleton

    Simpleton Well-Known Member

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    When I put the M8 on the driver side for a fuse panel one was fighting me too, it was just paint. Either clean it out with a tap if you have one or just run the bolt through slowly to do the dirty work.
     
  11. Apr 27, 2017 at 9:34 AM
    #11
    vtstouff

    vtstouff [OP] Member

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    Purchased. Very handy.
     
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  12. Apr 27, 2017 at 6:39 PM
    #12
    LS14ME2

    LS14ME2 Kind of a big deal

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    Curious, what are those holes on each side for?
     
  13. Apr 27, 2017 at 6:56 PM
    #13
    Simpleton

    Simpleton Well-Known Member

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    Fuse Block and on board air :thumbsup:
     
  14. Apr 27, 2017 at 6:57 PM
    #14
    LS14ME2

    LS14ME2 Kind of a big deal

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    Thanks, for what model or application?
     
  15. Apr 27, 2017 at 7:21 PM
    #15
    vtstouff

    vtstouff [OP] Member

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    Funny, after spending time looking in there today, I couldn't help wonder the same thing. On the passenger side down below those fender mount points, I have 3 threaded M8 bolts pointing up, two on the high side by the air filter mounts and another set an inch or so lower about 6 inches closer to the passenger firewall. A local fabricator is making me a mount for the CKMA12 on those 3 posts instead for a more sturdy position (but its lower in the engine compartment... potential hot air being drawn into the compressor air intake).

    I was wondering to myself what else would go there in another trim package that isn't in the TRD Off Road. A friend has a 2016 Limited so I was going to look in there next chance I get.
     
  16. Nov 11, 2017 at 5:51 PM
    #16
    88tacos

    88tacos Member

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    Is it the same for 2nd gen?
     
  17. Nov 11, 2017 at 6:35 PM
    #17
    Simpleton

    Simpleton Well-Known Member

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    I believe so, not much as changed in the little details between generations.
     
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