Quote:
Originally Posted by Sbean
Applying heat to the GP will cause it to expand. What you want to expand is the iron around the hole, without heating the plug. So try to heat the iron first, and fast; then try turning the plug. Steve
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While heating the Glow Plug will expand it; heating it will disturb how it is seated in the head.
While it goes against logic in the case of bolts and such this tends to help loosen them and allow Penetrating Oil to wick into the threaded area.
Illogical as it is I have seen it work before.
As you said heating the Head only will tend to enlarge the hole that the Glow Plug is in.
Combination: Heat the Glow Plug up good so it is expanded and pushing against the head. As it is cooling spray on the Penetrating Oil to get it to wick in between the threads.
Let every thing cool while in between spraying with more Oil.
When it is cooled Heat only the Head if you can.
When it is good and hot try removing the Glow Plug.
I have also seen where using a punch and Hammer giving the Head of a bolt several good but non-damaging raps on the head have helped to loosen it. Again you are disturbing the seating in the threaded area by doing this.