Injection timing is late or you have low compression. I'd adjust the valves, and check the chain for "stertch". If worn, replace. If problem isn't complete cured, adjust injection timing to spec.
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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