The only thing that is broken is the little brass gear that is located under the plug on the left front of the engine. (this is the side of the engine that is to your left as you are sitting in the car.
There is a replacement part and it can be replaced from the top in about 30 minutes.
I hope you get away this easily. I did on my '68. It ran fine after the repairs.
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS