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Plugs and mystery slot

Discussion in 'Stock 1995 - 2001 Explorers' started by Daisywheels, July 1, 2014.

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    1. Daisywheels

      Daisywheels Active Member

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      I swear I posted this, but maybe I did something wrong - sorry if it is a dupe!

      My neighbor buddy, along with my small hands and arms, finished changing the plugs. However we noticed a hole to the left of the front plug on bank one. We cannot identify it through that stupid Haynes manual. The hole looks like it takes a spark plug, but I got all six in. I know you all would need a pic, so here goes (I can't upload pics directly here);

      https://www.dropbox.com/s/ykhe46dxolwnptv/bank 1 plug1.jpg

      Any help would be greatly appreciated! Thx!

      Daisy
       
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    3. koda2000

      koda2000 Explorer Addict

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      it looks like it might be a small freeze plug, or maybe it's just a hole that is used during manufacturing, or is for some accessory your truck doesn't have. i wouldn't concern myself with it. engines and chassis have lots of holes with nothing in them.
       
    4. Daisywheels

      Daisywheels Active Member

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      mystery hole

      Thanks Koda, I was thinking it was for some kind of sensor. One less thing to buy!

      Daisy

       
    5. swshawaii

      swshawaii Explorer Addict

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      Last edited: July 1, 2014
    6. SoNic67

      SoNic67 Well-Known Member

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      As a side note, next time you can use a real picture saving service (like photobucket from above, not drop box) and use the "insert image" symbol, not the "insert link" one to attach pictures. Dropbox doesn't allow hard links.
       
    7. pcam13

      pcam13 Active Member

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      Possibly block heater ? IIRC the slot is on the right side.
       
    8. vroomzoomboom

      vroomzoomboom Elite Canuck STOCK SUCKS! Elite Explorer

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      SOHC motor? to me it almost looks like the bolt hole for the trans dipstick tube
       
    9. Daisywheels

      Daisywheels Active Member

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      Yes, it's a SOHC. It doesn't appear to be related to the transmission dipstick.

      Out of curiosity, what is a freeze plug, and their function, if any? As someone mentioned, it does look like it could just hold an extra plug, but who would do that? My best guess right now it is just a generic drilled opening in the head made for other reasons on other models.
       
    10. Flash

      Flash Well-Known Member

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      A freeze plug's function is to be the weak point if your engine coolant freezes.
      The ice in the water galleries expands and pushes the plug out instead of cracking the block.

      They are also the pour points and risers allowing for displacement in the casting process.
       
    11. Bobmbx

      Bobmbx Active Member

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      Does anything come out of the hole when the engine is running?

      If not, meh......
       
    12. Daisywheels

      Daisywheels Active Member

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      Yeah, there is some green gooey stuff poring out. Better call Ghost busters! LOL. No seriously there is nothing coming out. I don't have a compression guage, but I'll feel for air out or suction with just my finger. Thanks all. And thanks Flash for the definition of a freeze plug. Never heard of that before.
       

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