Quote:
Originally Posted by JimmyL
I'm doing horribly at asking my question. 
What part of the glow plug breaks??? Tip? At threads?
Dilithium Crystal? Warp plasma coil?
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The Hex head snaps off and it can be due to it being seized in the threaded area or the electrode of the GP being trapped in by Carbon or a combination of both at the same time.
I guess that it is also possible for the Plug body to come out and leave the Carbon trapped electrode in the Head.