Hi all

I am trying to replace the still operating but degrading ignition lock tumbler on my 1988 300E. I have already procured a new lock cylinder and master key for my car from the dealer ($138, ouch, and I had to travel 40 miles to the nearest dealer to order in person with proof of vehicle ownership...no phone orders for this part).


The key turns easily to the number 1 position and I have a tool made from a stiff coat hanger to the specifications in the workshop manual including the beveled tips. Furthermore, I installed the current tumbler myself a few years ago when the original cylinder gave out and at that time I omitted installing the black metal anti-theft collar / cap over the ignition tumbler so I don't have that to deal with.

I thought this job would be a piece of cake. WRONG. I have been trying for three days and the tumbler will not budge. I have fiddled endlessly with the wire tool and I can feel it meet resistance where I think I should be encountering the black spring metal radial clip. The tool is inserted deeply. I've even pulled on the key with pliers with the tool inserted with no luck.

I even tested the tool in one of my other cars, a 89 300E. As soon as I put the tool all the way in and past the spring clip the tumbler (and the black anti theft cover) practically fell out they slid out so easily.

Is there any thing besides the black metal spring clip that the tool depresses holding the tumbler in if the black metal anti-theft cap is removed?


I've read literally dozens of posts on multiple forums dealing with this replacement. Most of the problems are for stuck keys, won't turn keys, cant get the anti-theft cover off. After these problems are resolved the invariable follow up is "then it came right out"

Does anyone have any suggestions? Is there any thing besides the black metal spring clip that the tool depresses holding the tumbler in if the black metal anti-theft cap is removed?

I am close to removing the entire ignition lock assembly and replacing with one from the u pull it yard or drilling the tumbler out on the bench.

Any suggestions would be much appreciated


thanks