Oil Leak on my 1976 300DTurbo

Hi,<p>Forgive me if I am in the wrong forum.<p>My 1976 300D turbo was running just great until I decided to plug it in at night during a cold spell. Within two days it developed an oil leak that is now a big problem. <p>The leak is coming from a valve? that sticks out of the oil pump? It spits out oil until there is none left.<p>The compression and pump seem to be normal-it is just this piece that sticks out of the pump.<p>I hope I am not being too vague. I dont know much about Mercedes.<p>Any help is appreciated.<p>Thanks!