Hey Craig, that was very helpful. The only part of this procedure I am slightly wary of is disconnecting and then re-connecting the servo rod to the locking mechanism:
"...Take the screws off and fish the element out through the hole, twisting it in a vertical direction to *disconnect its arm from the arm that connects *to the locks "little flap". Somese there is a crucial little clip that holds everything together and likes to fall down into an impenetrable crevice. I hope that is NOT the case with the trunk lock mechanism! Thanks, Andrew 1985 300CD and 300TD; 1983 300TD On Tue, Feb 22, 2011 at 11:59 PM, Craig <[email protected]> wrote: > On Tue, 22 Feb 2011 15:01:56 -0500 andrew strasfogel > <[email protected]> wrote: > > > The vacuum locking system on the 1985 300CD leaks down in about 4 hours > > after locking the car. > > Having trouble-shot the vacuum system on our '82 240D/3.0 over the > weekend, I have a fresh memory about the system -- I expect the coupe's > system to be similar to the sedan. Our leaks were so bad, the vacuum > system could barely shut off the engine. > > > Opening the master (driver's door) lock does not result in opening any > > other door. (exception: when the vacuum is lost, the gas flap opens > > automatically). > > That's how things are supposed to work -- the FUEL filler flap is > single-action, locking only. When it looses locking vacuum, the spring > included on the vacuum element pushes it to the open position. That way, > you will always be able to fill the tank. > > > > I have not pinpointed the source of the leak but suspect it's the oldest > > vacuum element in the car - the trunk lock servo. > > That's the one that was leaking on our car -- BOTH the lock and the > unlock sides! They cost $62. > > > > This morning, I opened the master lock and went back to the (still > > locked) trunk to open it manually by inserting the key in the lock, > > turning it clockwise and pushing in the button simultaneously. The > > trunk sprung open as expected, but what I did NOT expect was that it > > REMAINED unlocked afterwards even though the vacuum power had already > > dissipated. Can someone explain this? > > Ummm ... counterclockwise? > > The lock and the vacuum element both move a little flap into position or > out of position to transfer the inward motion of the button to the > unlocking mechanism. By opening the trunk with the key, you moved the > little flap into position and when you pushed on the button, it opened > the trunk. When you took out the key it was left in position because > using the key apparently moved the vacuum element's diaphragm, too. > > To get to the trunk vacuum element, open the trunk and pry out the > plastic cover on the vertical portion of the inside of the trunk just to > the left of the lock. You will be able to see the locking (yellow/red) > and unlocking (yellow/green) Tecalan hard lines, two pieces of black > rubber tubing to connect the hard lines to the vacuum element, and the > vacuum element itself (ours is blue, like in > http://img.wpac.com/live/thumb/W01331624741VDO.JPG). > > The vacuum element is held to the sheet metal by two self-threading > screws with 8 mm heads. Take the screws off and fish the element out > through the hole, twisting it in a vertical direction to disconnect its > arm from the arm that connects to the locks "little flap". > > Once you have it out and the hard lines disconnected (DO NOT bend them > too sharply, they will break), you can check it out with your MityVac. > > Right now, pending receipt of the element from Rusty, the two pieces of > rubber hose for our car are pushed onto the legs of a galvanized fencing > staple to maintain vacuum-tightness for both the locking and unlocking > sections of our vacuum system. > > > Craig > > _______________________________________ > http://www.okiebenz.com > For new and used parts go to www.okiebenz.com > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
