Ignition switch problem

Thank you merc s500!!! I did everything!!!
OK, here's a little update: I pulled out (disconnected) the whole ignition switch assembly, and the key goes easily in to any positions now! (1,2 and start) , but as soon as I put the the whole ignition switch assembly back in to his place-same thing happens again!!!:crybaby2::crybaby2: (the key will not turn no matter what I do. Cannot get to position 1,2 ....) . pulled out- key goes easily in to any positions!!!
So, I think the problem is in steering lock mechanism, coz I try to turn it with a screwdriver with no luck anda steering wheel still locked!!!
need help ASAP,ASAP,ASAP!!!:surrender::surrender::surrender:

On the 140's there is an extra cable that goes all the way to the transmission wich is connected to the steering lock , maybe that is stuck down there somehow .Watch the short video below and check on that pin coming out on the end ,the one he's pointing at ,just that the 140 has a cable there i think instead ,i'm not familiar with the locks much ,sry i cant be more of help here only hinting out .Since the key works when you got it all apart maybe there is an obstruction or prevention behind the dashboard where the mechanism goes into ,the pins maybe have an obstruction on the sides where they cant open into to when you turn the key ,make sure that you check behind that hole with a torch .
Was the Steering in steering lock mode ,if YES ,have you try'd to put extra force to loosen it & turning the key ?,dont worry you cant make it worst then what it is already but sometimes that's just whats it is ,it seams strange that you can remove all the asembly there with the steering lock engaged ,weird .

ISS ,i had to re read your problem slowly & i'm coming to the simple conclusion ,to say " putt everything back the way it was & then " USE YOUR MUSCLES TO LOOSEN / FREE THE STEERING WHEEL LOCK by turning the steering wheel left ( i think,on mine that is )" ,i had that as well once ,that was the problem ,to scared to brake something ,i know how you treat your car ,well today is that day to hurt her a little.

Ok, little update! Still no luck!. I'm going crazy:crybaby2: Well, tomorrow I'm gonna drill that .....!?!?!?!?!?!? Here is few more pics.

The most important thing at this point is to remove the lock from the column. Once the loch has " locked" ( if for example the position of the connection to the thumbler has moved) you will be in DEEP trouble as you probably will have to cut of the lock assembly which is, you guessed it, hardened steel.

So remove the 10 mm nut from the security pin and push out the key from below. If you can't then ....

I ALWAYS remove the pin for ANY work on the steering lock assembly although it's a little bit tricky to get the pin back in place (a small magnet works).

I hope it's not locked. If you feel the slightest resistance when operating your key, get immediatly the little can of oil MB specfifies. Don't use anything else like WD40. This can work wonders. If not, get a new key from MB and see if this improves. If not change thumbler. There are no short-cuts to this, when it fails you might be stuck at any given point with the additional extra that you might be unable to remove the keys.

Changing the lock assembly is a couple of hundred dollars, but that is peanuts compared to have the lock blocked which is a dash - out operation cutting heavy-duty steel in a pretty confined space

Good luck

//matthias

Update

Update!!! I think this night I'm gonna sleep like a baby!!! I was able to unlock the steering column and pull it out the steering blocking device! ( I'm found online how to do it ) , and I don't know if it is is legal to put this info online or not, so let me know, and if yes, than i will do!!!
P.S. Any way I'm going to cut a piece on pics.8 (mark in red) and after that put the steering lock back in to place(steering column)!!! So in this case, my steering will never ever locked again.

more pics.

and few more...