Glow Plug Leak

[79jasper]

My understanding is the threads aren't used to seal, it's the base against bottom of the bore.

1993 F350 Crew Cab Dually
XLT
7.3 Factory IDIT w/Banks Sidewinder
5spd Manual

That is correct.

Has anyone used Teflon pipe tape for something like this, or does loctite have high temp sealants for this kind of thing?

You would never have a need for that, if everything else is clean and torqued properly.

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