Quote:
Originally Posted by babymog
Hot is a good idea for 606 glowplugs since they sometimes are a bugger. The aluminum has a much higher thermal coefficient of expansion than does the steel glowplug, theoretically decreasing the annular pressure & friction.
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My tiny brain does not understand. If warming metal expands it, then wouldn't that increase the friction between the metals (either aluminum or iron or both), and make it more difficult to remove the glowplug? I would think it a glowplig would come out the easiest after the car was left outside overnight in 30 degree temps.