Thanks Dan! Excellent description of how it works! Would love to see add'l info for the W124 --
BTW, when you're looking for leaks, where are you opening the Tee's for testing? At the main junction in the Passenger footwell? If so, I guess you watch to see which door lock opens/ or closes to determine which is bad or good? I'll bet there are some W126 Owners who would like more info also -- Thx - Larry T (67 MGB, 74 911, 78 240D, 91 300D) www.youroil.net for Oil Analysis and Weber Parts Test Results http://members.rennlist.com/oil PORSCHE POSTERS! youroil.net Weber Carb Info http://members.rennlist.com/webercarbs Porsche Road Test http://members.rennlist.com/roadtest/ . ----- Original Message ----- From: "LWB250" <[EMAIL PROTECTED]> To: "Mercedes Discussion List" <mercedes@okiebenz.com> Sent: Thursday, June 28, 2007 3:35 PM Subject: Re: [MBZ] Central locks failing > You don't need to tear the doors open unless you find > a bad actuator in one. > > The vacuum locking system only appears to be magic; > it's really quite simple: > > 1.) A main valve on the driver's door > > 2.) Hoses with a green tracer from there to various > "tees" in the system for opening (unlock) vacuum > > 3.) Hoses with a red tracer from there to various > "tees" in the system for closing (lock) vacuum > > 4.) Actuators at each door and trunk lid > > The main junction is under the carpet in the footwell > of the forward passenger seat. Separate the > distribution tee from the supply line and apply vacuum > to it. If the system won't hold vacuum, separate the > lines from the tee and start applying vacuum to each > one individually. Make sure the lock or actuator is > in the right position (unlocked if you're testing the > locking circuit) so you can see the actuator function. > >>From here you can narrow it down to a particular door, > trunk, or gas door actuator. > > I have found in a number of instances where an > actuator will hold vacuum in one position but not the > other, as the "folds" of the diaphragm create enough > of a seal to prevent a leak. > > Testing and troubleshouting the vacuum system > shouldn't take more than 10-15 minutes if you have > MityVac or some sort of vacuum source. > > There is some additional "magic" involving later model > systems that utilize the electric pump, like the 126 > and 124. If anyone is interested, I'll amend this > with the information for those systems. > > Dan > > --- R A Bennell <[EMAIL PROTECTED]> wrote: > >> My old 115 has intermittent door locks too. I have >> the vacuum pump tester doodad and need to start >> looking as well. >> Sometimes things work reasonably well - especially >> in hot weather, which leads me to believe that the >> rubbery >> connectors are failing. They seal better when warmed >> up? Often when I stop the car, the doors will all >> lock when I >> lock the driver's door but not always. I have to >> watch to see if the knobs go down and go around >> locking doors if >> they do not. For the longest time, I did not think >> my car had the locking fuel door but then one day it >> worked too. >> I think I need to order a bunch of the connector >> fittings from Rusty and have them available before I >> go digging to >> ensure that I can replace anything that looks or >> acts bad. Anyone have any idea what I should order >> in terms of T >> fittings and or straight fittings - IE - how many >> there may be in the vehicle? Given its age, it >> probably is not a >> bad idea to replace most or all of them. I asked but >> Rusty does not have a sort of sample kit available. >> He just >> sells them individually. I am sort of hoping that I >> do not need to tear the doors open. I have not tried >> removing >> panels from the MB but past experience with removing >> door panels on cars has shown me that it is usually >> difficult >> to do without causing some sort of damage to the >> panel. The clip things are usually stuck pretty good >> after years >> of being there and the panels are usually made of >> thin masonite or something that does not stand up to >> much prying. >> >> Randy >> >> -----Original Message----- >> From: [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] Behalf Of >> Jim Cathey >> Sent: Thursday, June 28, 2007 10:32 AM >> To: Mercedes Discussion List >> Subject: Re: [MBZ] Central locks failing >> >> >> > I have a Mity-Vac somewhere at home -- where do I >> start checking? >> >> In the trunk. Lines are accessible at the fuel flap >> lock. Test >> it, and the trunk actuator. (The latter is what I >> have found is >> the most likely to break first.) >> >> Under the carpets are plastic channels with the >> vacuum system >> tees in them. That's next. >> >> -- Jim >> >> >> >> >> _______________________________________ >> http://www.okiebenz.com >> For new parts see official list sponsor: >> http://www.buymbparts.com/ >> For used parts email [EMAIL PROTECTED] >> >> To Unsubscribe or change delivery options go to: >> > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >> > > > > > ____________________________________________________________________________________Ready > > for the edge of your seat? > Check out tonight's top picks on Yahoo! TV. > http://tv.yahoo.com/ > > _______________________________________ > http://www.okiebenz.com > For new parts see official list sponsor: http://www.buymbparts.com/ > For used parts email [EMAIL PROTECTED] > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.476 / Virus Database: 269.9.10/876 - Release Date: 6/28/2007 > 10:56 AM > _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
