Pull the sprocket off and check crank, key, and sprocket -- something is worn there. There should be next to no (or better none) play on the sprocket.

If the keyway is worn oversized in the crank, you may be able to get a good machine shop to cut it oversized and cut the keyway in the sproket to fit -- might need a gear shop for this.

If the camshaft is scored or beaten up, replace it, it's cheaper than getting a custom sprocket made to fit after grinding the crank down...

If the sprocket is worn, get a new one.


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!