Key stuck 87 300SDL, not sure what to blame - PeachParts Mercedes-Benz Forum

rektide · #1 01-20-2008, 12:42 PM

Greetings. I'm not sure what exactly is stuck here, but my key wont turn. It almost makes it to position 1, but stops short and something above the steering column emits a faint metallic click. My wheel is locked. If I rotate the wheel as far as it will go (again, locked) I can feel vibrations in the key as the wheel goes end to end.

I spent thirty minutes / an hour trying to jiggle it into turning on just one more time, but I think I'm really stuck.

I'm not sure what could have failed. I suppose its actually not all that important whethers its the cylender or steering lock, as my understanding is that I'll need to have the tumbler drilled out and replace the ignition lock, since I cannot get into position 1. But I'll ask anyways: Is the steering lock the same thing as the ignition lock? What are the most likely failures here? Is there any means of recovery short of drilling out the cylender and replacing everything?

This is most unfortunate. The $1000 dealer bill others have reported is way uncool.

nhdoc · #2 01-20-2008, 12:57 PM

Have you tried turning the wheel while you turn the key? If the car is shut off and the wheel is turned to its lock it can be very hard to turn the key before releasing the "pre-load" on it which means you need to turn the wheel in the same direction it was turned in before it locked while turning the key in order to release the wheel lock pin.

LUVMBDiesels · #3 01-20-2008, 01:01 PM

It could be the vacuum switch attached to the 'ignition' switch. My vacuum switch failed and it made it impossible to turn the key. Try removing the instrument panel and the kick panel under the dash then loosen the little vacuum switch located on the lower right side of the main switch. It looks like a cylinder with two vacuum hoses coming off it. It has a plunger that can interfere with turning the key.

Good luck!

rektide · #4 01-20-2008, 01:46 PM

I tried again while trying to turn the wheel, to no avail. You're right that turning the key after wheel lock takes a lot of of force, unfortunately the turning the wheel thing didnt seem to be enough to get my key working.

What is the most likely to have broken here? Thats one of hte original questions I asked, but its the one thats bugging me the most.

I'm wondering if a new key might have any chance of working any better. I cant believe this fiasco is going to cost me so much money, I would never expected my key to stop working. I am trying to think of pre-indicators, but for the most part the ignition seemed to work fine. Once a month it'd be a bit sticky and it'd take some force to turn the key, but I never would have imagined waking up one morning and the key simply not turning at all.

nhdoc · #5 01-20-2008, 02:00 PM

If you can take the key in and out and it turns at all then it is not the cylinder which is stuck, it is either the electrical switch, the vacuum switch or the steering lock which is interfering with it. I don't think trying another key will help. Try to do what the other poster said about disconecting the vacuum switch if you can.

dieseldiehard · #6 01-20-2008, 02:26 PM

Quote:

Originally Posted by nhdoc

If you can take the key in and out and it turns at all then it is not the cylinder which is stuck, it is either the electrical switch, the vacuum switch or the steering lock which is interfering with it. I don't think trying another key will help. Try to do what the other poster said about disconecting the vacuum switch if you can.

Trying another key is definitely recommended. If the old key isn't pressing the pins in the tumbler all the way then that will prevent the cylinder from turning to disconnect the steering lock.

Jiggle Jiggle Jiggle the key until you are convinced it won't turn THEN call a locksmith (If there is one that is nearby) or take it to a MB Indy shop that knows their stuff, they may have a mechanical key jiggler (it attaches to an air hose) - neat huh?
DDH

rektide · #7 01-20-2008, 02:35 PM

nhdoc, they key turns just a little, probably half way between off and position 1. i think i feel the tumblers enguage.

my guess is its the steering lock, based on the clicking i here and the mechanical feedback i feel between the key and the wheel. assuming this is the case, is there anything i can do about the wheel lock? (is this another name for the ignition lock, or something else?)

the car's parked on the street, i've been waiting all day for the guy ahead of me to move.

LUVMBDiesels · #8 01-20-2008, 02:43 PM

If you remove the panels like I said in an earlier post, you can access the bolt that attaches the wheel lock to the cylinder. try removing the bolt and shifting the cylinder.It might move enough for you to disengage the wheel lock. I still think it is the vacuum switch from your symptoms

rektide · #9 01-20-2008, 07:19 PM

Quote:

Originally Posted by LUVMBDiesels

If you remove the panels like I said in an earlier post, you can access the bolt that attaches the wheel lock to the cylinder. try removing the bolt and shifting the cylinder.It might move enough for you to disengage the wheel lock. I still think it is the vacuum switch from your symptoms

I'm going off the pictures at http://www.dieselgiant.com/repairignitionlock.htm and this, I'm not sure what bolt I'm looking for though. Is it the bolt right next to the steering column?

123Guy · #10 01-20-2008, 02:44 PM

If it's the steering wheel lock that's bad all you have to do is cut your wheels all the way left or right before you cut off the iginition and the steering lock will not engage. If you still have problems, it's the igintion. For the ignition, go to your favorite MB dealer with your title (that's to prove ownership and get the correct VIN number to order the new tumbler set) It will come with a new key (that will still work all your doors and trunk), because they make the key, then set the tumblers to work with the new key. It will cost around $100, but if you ask for your MBCA discount, they will probably drop the price by $20.

hey_allen · #11 01-20-2008, 04:09 PM

I'll second the suggestion to loosen the clamp on the steering lock shaft.
My car had progressively worse problems with being annoying to get loose, until I finally just bought a replacement steering lock assembly.
While it was giving me aggravation, I had the clamp band loose, and with a bit of wiggling the lock assembly up and down while making sure that the wheel wasn't binding up against the lock, it would usually pop loose relatively easily.

hangit · #12 01-20-2008, 05:57 PM

Go to www.dieselgiant.com for a pictorial.

John

rektide · #13 01-20-2008, 07:20 PM

I pulled of hte vaccum hoses and it hasnt fixed anything. I'm trying to figure out what the steering lock bolt is so I can fiddle with it, possibly grind/dremel it into dust.

LUVMBDiesels · #14 01-20-2008, 08:01 PM

Quote:

Originally Posted by rektide

I pulled of hte vaccum hoses and it hasnt fixed anything. I'm trying to figure out what the steering lock bolt is so I can fiddle with it, possibly grind/dremel it into dust.

You have to loosen the vacuum switch from the main switch. Try taking it off completely just taking the hoses off will not do anything...

I thought I had said that in my first post. Sorry if I was not clear

The steering lock bolt is on the long tube that runs from the ignition switch to the steering column. Feel along it and you will find a bolt that goes through the clamp.

rektide · #15 01-21-2008, 06:13 PM

I hath failed. I pulled out the instrument panel but I dont see any way of unscrewing the vaccuum unit, and I cant really get a good look at the bolt on the steering lock.