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Re: Getting ready to replace GPs
That info is for glowplugs that have bent or swollen tips. Removing them causes the tip to break off, putting the piston at TDC is to have a small space while you try to blow out the glow plug tip.
I believe that if your truck is cold starting fine and the controller cycles normally, you shouldn't have a problem. I'd just unscrew them and see if they will pull out. If not, then I'd go to the trouble of finding TDC for that cylinder. Every Autolite doesn't melt, although there are enough that do to warrant replacement.
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