Help!, I need to Break into Diesel 1983 - Page 2 - PeachParts Mercedes-Benz Forum

ROLLGUY · #16 09-10-2017, 01:32 PM

Quote:

Originally Posted by sixto

There are two vacuum actuators and two signal lines in older lock systems - one to lock, one to unlock. The system is also fully mechanical from the driver door - no switches or wires to signal a pump. Later systems with dedicated pumps switch beween vacuum and pressure. I don't know if the older system will unlock if you apply vacuum to the unlock circuit in the trunk.

Sixto
98 E320s sedan and wagon

About the same as I explained it, thank you.

Quote:

On a W123 ALL of the locks work on vacuum, NOT pressure. The later W124, 126 etc use a pump (some mounted under the rear seat, others in the trunk). It uses pressure to unlock, vacuum to lock. Unlike the W123 (green stripe=unlock, red stripe=lock), the pump uses only one line on each vacuum pod to lock/unlock.

tangofox007 · #17 09-10-2017, 01:54 PM

Quote:

Originally Posted by sixto

I don't know if the older system will unlock if you apply vacuum to the unlock circuit in the trunk.

The problem with that approach is that the "unlock" circuit is not airtight when the driver door valve is in the "lock" position. The easiest thing to do is apply pressure to the "lock" circuit. That essentially reverses the normal process and will unlock the vacuum actuated locks.

Quote:

Originally Posted by sixto

Later systems with dedicated pumps switch beween vacuum and pressure.

All the systems switch between vacuum and pressure. In the W123, the pressure comes from the atmosphere instead of a pump.

tangofox007 · #18 09-10-2017, 02:26 PM

Quote:

Originally Posted by ROLLGUY

On a W123 ALL of the locks work on vacuum, NOT pressure.

Not true. There is vacuum on one side of a diaphragm and pressure on the other side.

rocky raccoon · #19 09-10-2017, 03:00 PM

It's happening again to LindaJane. She asked a simple question and received an argument among alleged experts.

LindaJane; the only way one can lock keys in a Mercedes is to lock the driver's door from inside the car then climb over the console and exit and lock the passenger side or lock all doors then reopen the passenger side, throw your keys inside and relock the passenger side. Neither is easy or likely.

I think your key is misplaced.

sixto · #20 09-10-2017, 03:02 PM

As I follow that thinking, you'd need constant vacuum for the doors to stay locked. In the dual circuit system, vacuum is applied momentarily to lock the doors. The doors stay locked when the system is isolated from the vacuum supply including if the vacuum supply runs out. Likewise for unlock.

ROLLGUY, I didn't get to my post count with original content

Sixto
98 E320s sedan and wagon

sixto · #21 09-10-2017, 03:07 PM

Quote:

Originally Posted by rocky raccoon

It's happening again to LindaJane. She asked a simple question and received an argument among alleged experts.

LindaJane; the only way one can lock keys in a Mercedes is to lock the driver's door from inside the car then climb over the console and exit and lock the passenger side or lock all doors then reopen the passenger side, throw your keys inside and relock the passenger side. Neither is easy or likely.

I think your key is misplaced.

I'll ask the question I've hesitated to ask - can't you see through the windows if the keys are in the cabin?

When my '83 SD driver door lock was failing, I'd open the rear door, push down the driver door lock pin then close the rear door. Do 123 doors not lock if the door is open?

Sixto
98 E320s sedan and wagon

rocky raccoon · #22 09-10-2017, 03:10 PM

sixto: All doors on a W123 will lock with the door open EXCEPT the driver door. That feature is designed to prevent what happened to LindaJane.

Squiggle Dog · #23 09-10-2017, 03:52 PM

I wonder if you can simply remove the inner fender panel to access the vacuum storage pod and then disconnect one of the vacuum lines and apply pressure or vacuum to one to get the door locks to open?

rocky raccoon · #24 09-10-2017, 04:47 PM

in a W123 is in the trunk.

sixto · #25 09-10-2017, 05:02 PM

Going back to the OP, if you can't hook the door lock pin, hook the door release lever. The release lever will open the door even if the lock button is down. Send the hook down from above then slide the loose end down to the belt line and pull. i didn't go back to the top so this might have been suggested earlier

Sixto
98 E320s sedan and wagon

ROLLGUY · #26 09-10-2017, 05:19 PM

Quote:

Originally Posted by sixto

ROLLGUY, I didn't get to my post count with original content

Sixto
98 E320s sedan and wagon

Sometimes I have the same problem, this seems like one of them

97 SL320 · #27 09-10-2017, 05:25 PM

When getting into a car, always work the passenger or rear doors. This way if the linkage is popped off, the car is still usable with out inconvenience.

Also, do a walk around and try every door first.

I have a bent rod / wedge that goes between the side glass and wiper, in to the door , under the glass , the back out inside the car. It is shaped to allow operation of locking levers / buttons.

Someone was using plastic pallet banding to grab lock buttons ( the mechanical one not all door locking )

DrLou · #28 09-10-2017, 06:37 PM

( I realize it's not funny when a Diesel Compatriot has these troubles.. )
But it's funny!
I solved this problem a few months ago by leaving my rear window regulator sliders un-repaired! Still enough friction that the windows stay up in my driveway, but easy to slide down by hand...
Heck, I don't need keys! Ha!
Yes, I know; I gotta fix it.