Those single row chains really only last about 100,000 miles before they get too long and the valve timing gets late.

I would replace it, they aren't expensive.

Those 103's live forever (500,000 miles and up) if you keep good oil in them.

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!