How to remove a stuck spark plug

General Mopar Tech Discussions

  1. Dakotaacres

    Dakotaacres Well-Known Member

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    Any suggestions on how to remove stuck plugs. Just picked up a 383 charger. Was going to put new plugs in but the first one I tried to remove is stuck. I don't want to go any further. I have no idea how long these plugs were in the engine.
     
  2. MoparMitch

    MoparMitch FBBO Gold Member FBBO Gold Member

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    Spray around it with some PB Blaster or some Kroil, and let it sit for a day......
     
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    • Fran Blacker

      Fran Blacker FBBO Gold Member FBBO Gold Member

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      Are they aluminum heads? hope not.
       
    • Dakotaacres

      Dakotaacres Well-Known Member

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      nope, stock
       
    • Thrashingcows

      Thrashingcows Well-Known Member

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      PB blaster or some old transmission fluid works well, also cycling some heat on them to help break up the corrosion holding them in place.
       
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      • R413

        R413 Well-Known Member

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        Some idiots torque them like lug nuts. Does the car run right now?
         
      • Ranger16

        Ranger16 Well-Known Member

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        Might try running the engine to heat them up, but that's not gonna be any fun with those 383 exhaust manifolds. OUCH!
         
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        • Dakotaacres

          Dakotaacres Well-Known Member

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          car runs and drives. runs rough
           
        • Don Frelier

          Don Frelier FBBO Gold Member FBBO Gold Member

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          I'd take them out hot.
          Plug socket and 1/2" drive ratchet.
          Start with the easiest one and see how it goes.
          If you can get on them with a small impact that would really be the ticket.
          I usually do mine with a box wrench believe it or not.
           
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          • Don Frelier

            Don Frelier FBBO Gold Member FBBO Gold Member

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            That said I'd park the car in a place where the heads could be removed it things go sideways. (plug snaps off)
            I had a 3.9L in an old Dakota that had possibly never had the plugs changed with well over 100K.
            I spent 1/2 hour on one plug 1/8 turn out then back in... I'm very stubborn.
             
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            • RJRENTON

              RJRENTON FBBO Gold Member FBBO Gold Member

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              Just be careful....on my RS23V0A, I change plugs ftom underneath the car using a six (6) point combination wrench just the box end. Driver's side is manageable from the top side but the passenger side is impossible from the top. As suggested, use PB Blaster or Kroil but with a cold engine. Using a box end combination wrench lessens the possibility of breaking the porcelain, as the effort will be directly applied to the hex part of the plug and depending on the brand of the plug, some are more robust than others, specifically Autolite. The newer Champion plugs with a cold press area directly below the hex are susceptible to breaking.

              Several years ago I was changing plugs on a Ford 406 engine with 18mm taper seat plugs with a 1/2" drive deep well 13/16" hex spark plug socket and the last one on the right side seemed more stubborn than the others, so I applied more effort on the ratchet handle....result the plug broke off right below the hex, with the threaded end stuck in the head, the porcelain part came out in one piece, leaving a hollow slug in the head......many expletives....OH WELL....soaked the shell with liquid wrench, grabbed an EZ-out, with a hex nut pressed on the end and screwed it in the hollow slug of the shell and applied much torque to the wrench with the understanding that if it breaks, the head must come off or ...... but the wrench Gods were smiling and the plug shell came out, squeaking. Morale of STORY....ALWAYS use a dab of anti-seize on the spark plug threads ...ALWAYS. And just snug the new plug in...no need to crush it in, just 10-15 pound feet of torque will be sufficient.....Just my opinion of course..
              BOB RENTON
               
              Last edited: Jun 3, 2020
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              • Thrashingcows

                Thrashingcows Well-Known Member

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                I'm a firm believer in never seize, bought a 48 Dodge sedan parts car that looked like it had been sitting in a swamp. I needed some differential parts for my 48 Desoto 2dr sedan I was bring back from the dead and looked at those lug nut bolts and though there was no way they are going to come loose without at least a few of them snapping off or having to resort to liquifing the offending unit. But put my 1/2" drive 6 point socket on the first one with a 2 foot breaker bar and gave 'er a tug....darn thing spun out like it was just installed yesterday. Turned out a previous owner had put never seize on ever single lug nut bolt!!

                So been using never seize on pretty much anything and everything since then.
                 
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                • 493 Mike

                  493 Mike FBBO Gold Member FBBO Gold Member

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                  I put it on the rear drums on my 94 2500 Dodge soon after purchase. Right where the drum goes on the axle and it still pops right off if need be. Good stuff!
                  Mike
                   
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                  • steve340

                    steve340 Well-Known Member

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                    As others have said soak with lubricant.
                    You could try a breaker bar rather than a ratchet it will give you much more control due to it's extra length. Hopefully you can get in there.
                     
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                    • WP29440SE

                      WP29440SE Well-Known Member

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                      I have had good luck with a breaker bar as well. definitely let them soak for a day or two in some good penetrating oil. if you decide to try cheater, ease into it, don't try to jerk them loose
                       
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                      • 1967coronet

                        1967coronet FBBO Gold Member FBBO Gold Member

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                        make sure to use a 6 point plug socket also.
                         
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                        • toolmanmike

                          toolmanmike Henchman #2 Staff Member FBBO Gold Member

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                          What brand of plugs are they. The last set of Autolites I took out I had to use a 18" 1/2 drive ratchet. They squeaked and squalked all the way out.
                           
                        • Billccm

                          Billccm FBBO Gold Member FBBO Gold Member

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                          ATF and acetone work well.
                          It could have been cross threaded when installed.
                           
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                          • Dakotaacres

                            Dakotaacres Well-Known Member

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                            can't tell, I'll have to climb under and see. I can see they are rusted.
                             
                          • tommytunes

                            tommytunes Active Member

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