Thanks to you all for your hints.
Today I tried it with welding wires. Its hard to locate the ongoing drainhole.
Took off the alternator, fan shroud, ac compressor and will clean everything. Some screws and bolts weren't installed correctly and I will make everything how it should be.
I will take off the passenger valve cover soon.
What is this bracket for? There wasn't anything attached.
If I would have an engine crane, I would have taken out the engine. But I think I will can make that this way too.