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Spark Plug Tools: Important

Discussion in 'Technical Chat' started by jeremy_283, Mar 7, 2012.

  1. Mar 7, 2012 at 10:52 PM
    #1
    jeremy_283

    jeremy_283 [OP] Super Member

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    As some of you may know from another thread of mine I recently replaced my plugs. I have always been skeptic as to the accuracy of coins but here are some photos. I use to use the coins but most recently I used the wire gauge and to my astonishment for the first time ever all plugs were in spec per the reading on the wire gauge. The gap to me appeared to be to small with the coin. With the gaps set with the wire gauge it also seemed as if my truck was peppier and more powerful but maybe that was my imagination. These photos are with one of the old plugs I pulled out of my truck. I'm not sure which measurement tool is most accurate but this at least shows you the differences.

    ImageUploadedByTapatalk1331189498.657089.jpg
    ImageUploadedByTapatalk1331189511.202920.jpg
    ImageUploadedByTapatalk1331189528.828506.jpg
     
  2. Mar 11, 2012 at 2:59 PM
    #2
    MGRS

    MGRS Well-Known Member

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    I just got out my 99 cent Oreilly's coin gauge and put a micrometer to it.

    I gap at .40, so I measured there. It mic'ed exactly correct. I suppose there may be some variation caused by the sloping design of a coin tool, but I think it would be minimal.
     
  3. Mar 11, 2012 at 3:06 PM
    #3
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Ive checked my coin gauge against my feeler gauges, and it seems spot on.
     
  4. Mar 11, 2012 at 3:09 PM
    #4
    scocar

    scocar Scouting the perimeter for weakness

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    On the K16TR11s for the 5VZ (1st gen V6), you actually need one of these L-shaped gauges because of the shape of the dual ground electrodes; they have tiny "devil horns" that prevent you from sliding in either of the other types of tools for an accurate read.
    [​IMG]
     
  5. Mar 11, 2012 at 4:00 PM
    #5
    scocar

    scocar Scouting the perimeter for weakness

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    Hell, when I picked up six Densos from the dealer, I visually checked them at the counter. Two plugs has such badly aligned electrodes (grounds off center) that I rejected them and asked for two others. But all six I ended up with were dead on. So right there is a 33% chance they'll be screwed out of the box...
     
  6. Mar 11, 2012 at 4:10 PM
    #6
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    I don't know what kind of metal they are made out of. Whatever it is, the few I have show no signs of wear. 1 of them is at least 30 years old. The newest 1 that I have I have used to pry open things as well as check spark plug gap, and it to shows no signs of wear.
     
  7. Mar 11, 2012 at 4:14 PM
    #7
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    I just talk to a friend of mine, And he said that most coin spark plug gapping tools are made from hardened steel. Some can be made from hardened stainless steel. As for the cheap ones that you see at the auto parts store , we don't know.
     
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