Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help

Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 05-27-2000, 10:38 PM
Registered User
Join Date: May 2000
Posts: 35
None of the door locks, or fuel door lock, or trunk lock functions on my 82 240D. The vacuum pump and resevoir do appear to operate. There is no vacuum to the valve in the drivers door. Tracing the main vacuum line from drivers door, thru the firewall, it goes to two plastic valves located on the cam cover, which are operated by a cam on the throttle linkage. What are these valves? I have vacuum up to the union near these valves, but none past. Is this some kind of shuttle that regulates vacuum by engine speed?

82 240D

Reply With Quote
Old 05-28-2000, 01:34 AM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
The vacuum for the A/C controls and the Door locks comes from the brake booster vacuum supply line. So does the vacuum for the transmission controls. THEY DO NOT COME through the same port off the supply line. For many reasons they can not be put together. The biggest reason is that the vacuum to the trans is dropped to zero at full throttle. That would play hell with the A/C and door locks if they were on the same line.

The point of this is that the lines to the door locks shouldn't be attached to the lines at the valve cover. Those are the EGR and trans control systems.

The supply line should come from the booster line and split to the A/C (green), Door Locks (yellow) and the shut-off system (brown). There are two yellow lines as one goes to the vacuum reservoir in the truck and the other goes to the drivers door master switch.
Reply With Quote
Old 05-28-2000, 01:45 AM
Registered User
Join Date: May 2000
Posts: 35
Thankyou so much! I couldn't see what door locks had to do with engine speed-- perhaps a previous owner mixed up some lines? Maybe this has something to do with the improper trans shifts? Only got this project car a week ago.
Reply With Quote
Old 05-28-2000, 09:47 PM
Registered User
Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
Steve has given you valuable advise. Now to put it into action, we offer the CD rom set that covers your 123 chasis car. It is the same one that we use in the shop.

Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
Reply With Quote
Old 05-29-2000, 12:21 AM
Registered User
Join Date: May 2000
Posts: 35
Yipeee! Thanks again for the help-- the whole vacuum system was in total disarray, managed to get it back together, now tranny shifts great, door locks next. I would be buying that CD NOW, if only I had a computer (I use Web TV). I'm sure that would make the job much easier.

82 240D

Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
240d Vacuum Leak jim16671836 Diesel Discussion 1 10-12-2004 10:11 AM
Where can I find a full vacuum diagram for an 83 240D? Carrameow Tech Help 0 12-20-2001 11:49 AM
1979 240D Green Vacuum Line Question bigbrowndog Tech Help 0 07-26-1999 03:43 PM
'77 240D won't hold vacuum when doors are locked cope Tech Help 3 07-21-1999 08:33 PM
Door lock diagnosis & repair, by popular demand ncarter Tech Help 1 07-15-1999 10:24 AM

All times are GMT -4. The time now is 05:35 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page