it probably needs a starter motor. youll need to get under the car and check for 12v volts with the key in the starter position at the small wire at the starter. if you have voltage when holding the key in the starter position you need to replace the starter motor.

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg