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The glow plugs are a resistance coil of some shape or other inside the steel tube. The longer they run, the hotter the coil gets, and eventually it will sag or twist and weld to the side of the tube. It will still heat, but the tip of the plug doesn't get hot anymore, so the engine is hard to start. Champions will break the filament off the tip weld, leaving a nice little hole.
Once the GPs are bad, they stay bad.
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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