You must match the balance on the flywheel to the old one, or disassemble the engine and have the crank, flywheel, and front balancer balanced together, drilling the flywheel.

It's also possible that you have the flywheel out of place -- one bolt is offset to "key" the flywheel, but if you screw the bolts in to the "neck" when installing, you can get it on in any position due to the small diameter of the stretch bolts.

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!