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Glow Plug removal can seem straight forward, but if the incorrect tools are used the chances of breaking off the glow plug or damaging the cylinder head are greatly increased. These are the same tools we use in house at Merchant Automotive.
Well...I was looking at adding an impact hammer to my tool collection, but turns out I didn't need it at all but that specialty socket is awesome!. I hit all of the glow-plugs with PB blaster and they all broke free with probably around 15 ft.lb. of force just a little more than recommended recommended tightening torque. I had ONE that I thought I might have to breakout the impact hammer for, but I held consistent force on it for about 5 seconds and it broke free. I found a pretty ample amount of anti-seize on the old GPs making me wonder if they'd already been swapped in the lifetime of the truck ...there were only 2 showing bad in the DTC codes, but I figured I'd get all of 'em brand new, to level-set. I too used an ample amount of anti-seize, but not too much, to make future removals pretty effortless.