I don't think the injector is inline with the glow plug.

Beyond the tip of the glow plug is the opposite side of the pre-chamber and then the head casting. If you could drill through the pre-chamber wall, you would hit coolant.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250