Bad injectors shooting a solid stream of fuel rather than an atomized mist. They can burn through the prechamber on the side, too, if spray sideways.
Busted ball pin could do the same, I think.
Excessive oil burning from a bad vac pump will also burn the prechambers.
Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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