Should be a cover plate on the bottom of the bell housing, two small bolts (probably 10 mm). Plate is slotted for air movement.

This will give you access to the flywheel gear and the drain plug.

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!