Get you timing chain checked for stretch. It could be getting kinda long. Also, the tensioner could be stuck, allowing the chain to slap.

You could also have a sticking injector -- they make a loud snap or crack when they stick open or open very late. Usually makes the engine idle rough, too. Sounds almost like someone is tapping on the block with a steel hammer.

The bad noises on this engine are clanks, like a piston is loose and banging (which is it). Oil consumption goes sky high first, though, as the cylinder wears from the bend rod(s).

Later engines appear to be better than earlier ones.

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!