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Size Of Idle Control Valve Bolts

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    Size Of Idle Control Valve Bolts

    On a 1993 GM (4.6l), are the Idle Control Valve bolts 8 MM? I believe they are but would like to verify.
    What I Own: 1993 Mercury Grand Marquis GS
    What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

    #2
    If they are anything like the IAC bolts on a 5.0, then yes. 5/16ths will also work in a pinch.
    1985 LTD Crown Victoria - SOLD
    1988 Town Car Signature - Current Party Barge

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      #3
      Do you mean the socket size, or the actual bolt?
      ..

      Comment


        #4
        Originally posted by massacre View Post
        Do you mean the socket size, or the actual bolt?
        Socket size but bolt specs would be nice to know as well.
        What I Own: 1993 Mercury Grand Marquis GS
        What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

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          #5
          No clue about the thread specs, but it's an 8mm head.

          Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
          rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
          Originally posted by gadget73
          ... and it should all work like magic and unicorns and stuff.
          Originally posted by dmccaig
          Overhead, some poor bastards are flying in airplanes.

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            #6
            Originally posted by sly View Post
            No clue about the thread specs, but it's an 8mm head.
            Good enough - confirms my suspicion.
            What I Own: 1993 Mercury Grand Marquis GS
            What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

            Comment


              #7
              I think the thread is M8 as well, its an odd reduced head bolt. Normally 8mm head is on an M6 bolt, and I'm pretty sure those are larger than M6. M6 basically 1/4", M8 is 5/16".
              86 Lincoln Town Car (Galactica).
              5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

              91 Lincoln Mark VII LSC grandpa spec white and cranberry

              1984 Lincoln Continental TurboDiesel - rolls coal

              Originally posted by phayzer5
              I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

              Comment


                #8
                Originally posted by gadget73 View Post
                I think the thread is M8 as well, its an odd reduced head bolt. Normally 8mm head is on an M6 bolt, and I'm pretty sure those are larger than M6. M6 basically 1/4", M8 is 5/16".
                Excellent info to have - many thanks!!
                What I Own: 1993 Mercury Grand Marquis GS
                What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

                Comment


                  #9
                  5/16" is just almost 8mm ... but 8mm is 8mm
                  5/16" is 0.3125", x 25.4 (# of mm per inch) = 7.9375mm
                  8 - 7.9375 = 0.0625 difference
                  8mm is 0.3149606299212598" - 0.3125" (5/16") = 0.0024606299212598" difference

                  One could just call it as less than two and one half thousandths of an inch difference between 5/16" and 8mm on a good day.
                  I use the sockets/wrenches interchangeably.
                  No ... I'm not arguing with you ... I'm just explaining why I'm right ...

                  Now go ... and whatever you do ... have a safe trip!

                  Comment


                    #10
                    Originally posted by tbear853 View Post
                    5/16" is just almost 8mm ... but 8mm is 8mm
                    5/16" is 0.3125", x 25.4 (# of mm per inch) = 7.9375mm
                    8 - 7.9375 = 0.0625 difference
                    8mm is 0.3149606299212598" - 0.3125" (5/16") = 0.0024606299212598" difference

                    One could just call it as less than two and one half thousandths of an inch difference between 5/16" and 8mm on a good day.
                    I use the sockets/wrenches interchangeably.
                    LOVE the detailed specs! I'd still go with an 8 MM socket - why use something "close" when one can use the precise one? Of course, if one didn't have the precise one....
                    What I Own: 1993 Mercury Grand Marquis GS
                    What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

                    Comment


                      #11
                      two and a half thou would be well within manufacturing tolerance for the bolt head and the socket so honestly you'd never notice the difference. You're talking less than the thickness of a sheet of paper.
                      86 Lincoln Town Car (Galactica).
                      5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

                      91 Lincoln Mark VII LSC grandpa spec white and cranberry

                      1984 Lincoln Continental TurboDiesel - rolls coal

                      Originally posted by phayzer5
                      I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

                      Comment


                        #12
                        I gots plenty of both SAE and Metrics, butI find very often that a 5/16" socket fits the 8mm bolt hex head even better than an 8mm socket does.
                        No ... I'm not arguing with you ... I'm just explaining why I'm right ...

                        Now go ... and whatever you do ... have a safe trip!

                        Comment


                          #13
                          If the need arises I'll try both to see which is a better fit.
                          What I Own: 1993 Mercury Grand Marquis GS
                          What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

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