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D_Ryan 01-05-2010 09:25 PM

Another door lock question
 
Good Evening All;

A search of past posts fails to turn up one with the same issue, so I need to ask for a consensus on the cause of my non-operational passenger side front door lock... Vehicle is a 1985 300TD.

This is not a lock cylinder which will not turn; rather the key inserts just fine and the cylinder turns without issue. The problem is that turning the key/cylinder does NOT release the door locking mechanism. The only way to lock/unlock the door is via the locking knob on the inside of the door.

The cylinder did work without incident, then suddenly no longer did, as if the connecting rod is no longer engaged.

I pulled the door panel, but it is difficult to see up into that area of the door to get an understanding of how the rotation of the lock cylinder manipulates the door locking mechanism.

What is the likely cause of failure, and the best fix?

Thanks,
Dave

rhodes2010 01-05-2010 11:07 PM

Glad you got into the door panel.

I recommend go back in there and remove the entire door handle mechanism to investigate further.

True it is almost impossible to see up in there.
Wish I had a picture to illustrate, but it sounds like the connection between the back of key tumbler and lock has come apart.

Cr from Texas 01-05-2010 11:49 PM

Try a digital camera. I've found it helps in tight places. Stick in the camera from a couple of angles and look at the pictures.

Ilse 01-08-2010 05:38 PM

I am having what seems to be a similar issue on my 1987 190D, on both front door locks; you can put the key in the lock and turn it, and even wiggle the lock knob thing on the inside a bit, but not enough that they door will actually unlock. Which is a problem, as it means that I can't lock my car.

I only bought this car about a month ago, so I don't know how/when this started happening. Apparently in my car, there is a vacuum pump in the back, under the backseat, which controls the doorlocks, so I'm going to take a look at that and possibly replace it with one I pulled from a junkyard 190E (which has donated several other parts to my car, including a tie rod, horn, fusebox cover, lugbolts, transmission fluid dipstick, and heater pump).

Hopefully that will work; otherwise I'll probably be pulling off door panels and wiggling around digital cameras at odd angles as well!

Biodiesel300TD 01-08-2010 05:50 PM

Dave there is a plastic cone shaped piece that is part of the doorlock mechanism that brakes. It it was transfers the rotating key/lock to the actually door lock mechanism inside the door. The older models have a metal piece while the newer models have a plastic one. The piece brakes and doesn't transfer the rotating motion to the door lock. My wagon has done the same thing. A junkyard is the only place I've ever found them. But I've never tried very hard to find a new one


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