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Glow plug thread size? Building a compression tester.

Discussion in '1982-Present GM Diesel' started by FWP, Sep 22, 2004.

  1. FWP

    FWP CRS

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    I'm going to make my own compression tester, Does anyone know the spec on the glow plug threads? Pitch and Diameter? Thanks.
     
  2. FWP

    FWP CRS

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    M10 X 1. Maybe a bolt with a hole tapped into it for 1/16 NPT? Or maybe modify a bad glow plug? /forums/images/graemlins/thinking.gif
     
  3. azblazor

    azblazor 1/2 ton status Premium Member

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    There is a guy on the diesel page who drilled out a glow plug and made a luminosity probe out of it. If he could do that I would think one could be made into a pressure tap.
     
  4. FWP

    FWP CRS

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    Yup, that's what I was thinking.
     
  5. Diesel Dan

    Diesel Dan 1/2 ton status

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    [ QUOTE ]
    M10 X 1. Maybe a bolt with a hole tapped into it for 1/16 NPT? Or maybe modify a bad glow plug? /forums/images/graemlins/thinking.gif

    [/ QUOTE ]

    Did the glow plug thing.
    Save your time and just buy the adapter from Matco for $15. The compression gauge and adapter run less than $80 IIRC. Wish I had went that route, would have saved lots of time. I bought my compression gauge from a parts store, don't recall the price. At that time I not even though about Matco, they are much cheaper than Snap-on for the compression gauge.
     
  6. FWP

    FWP CRS

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    [ QUOTE ]
    Did the glow plug thing.
    Save your time and just buy the adapter from Matco for $15.

    [/ QUOTE ]

    Ahh, I knew there was someone who went through this already. Thank you sir /forums/images/graemlins/thumb.gif Saved me some brain waves /forums/images/graemlins/histerical.gif
     
  7. imiceman44

    imiceman44 1 ton status

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    [ QUOTE ]
    [ QUOTE ]
    Did the glow plug thing.
    Save your time and just buy the adapter from Matco for $15.

    [/ QUOTE ]

    Ahh, I knew there was someone who went through this already. Thank you sir /forums/images/graemlins/thumb.gif Saved me some brain waves /forums/images/graemlins/histerical.gif

    [/ QUOTE ]

    Harbour freight has a tester now on sale for under $150 and it has all the adapters to cover any diesel on the planet well at least for the Medium duty and down.
    I got mine from napa for $300 and only has a couple adapters. /forums/images/graemlins/dunno.gif
    I think I want to get this one just to have all the adapters.
    /forums/images/graemlins/thumb.gif
     
  8. Diesel Dan

    Diesel Dan 1/2 ton status

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    Also need to point out that the new adapter I have gives 20-40 psi higher readings. Must have been the converted G/P I used did not have a large enough hole or high enough flowing check valve.
     

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