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-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 07-01-2019, 09:46 PM
Registered User
 
Join Date: Jun 2019
Posts: 66
Question Requesting Primary Vacuum Systems audit

1983 300D Turbo - Automatic

Would like someone with a good eye to see if this vacuum setup works or suggestions how to clean it up.
https://i.imgur.com/qPRLPP9.jpg
https://i.imgur.com/bdqAMlj.jpg
https://i.imgur.com/JbNXfdm.jpg
https://i.imgur.com/c6SrciW.jpg

Notes:
-EGR, Vacuum temp sensor are plugged with vacuum caps. 5way on top off valve cover is bypassed.

-Central locks disabled, HVAC disabled.

-Overboost valve: Top port goes to ALDA, bottom port connects to rear of manifold banjo.

-VCV: Top port goes to transmission, bottom port connected with black hose goes to cabin, as a vent.

I’m mainly concerned with the mess above the VCV. There are many 3 way connectors that lead to know where.

I’m getting proper vacuum tho, I believe (I don’t remember the vacuum acronym) 24 vacuum and 16 from transmission.

Reply With Quote
  #2  
Old 07-01-2019, 09:55 PM
Registered User
 
Join Date: Sep 2013
Location: Alhambra California
Posts: 3,129
Vacuum is measured in inches of vacuum.
Reply With Quote
  #3  
Old 07-02-2019, 02:02 AM
Registered User
 
Join Date: Oct 2013
Location: New Zealand
Posts: 538
Quote:
Originally Posted by BWhitmore View Post
Vacuum is measured in inches of vacuum.
And how much vacuum is an inch of vacuum?


Inches of mercury, or sometimes water.
__________________
1978 300D, 373,000km 617.912, 711.113 5 speed, 7.5mm superpump, HX30W turbo...many, many years in the making....
1977 280> 300D - 500,000km+ (to be sold...)
1984 240TD>300TD 121,000 miles, *gone*
1977 250 parts car
1988 Toyota Corona 2.0D *gone*
1975 FJ45>HJ45
1981 200>240D (to be sold...)
1999 Hyundai Lantra 1.6 *gone*
1980s Lansing Bagnall FOER 5.2 Forklift (the Mk2 engine hoist)
2001 Holden Rodeo 4JB1T 2WD

Reply With Quote
  #4  
Old 07-02-2019, 02:09 AM
Registered User
 
Join Date: Sep 2004
Posts: 8,971
Quote:
Originally Posted by Wusha View Post

-Overboost valve: Top port goes to ALDA, bottom port connects to rear of manifold banjo.
None of which has any connection to the vacuum system.
__________________
When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl.
Reply With Quote
  #5  
Old 07-02-2019, 02:27 AM
JHZR2's Avatar
Registered User
 
Join Date: Jan 2002
Location: New Jersey
Posts: 5,265
If you’re concerned with the mess on the VC, have a look at a vac diagram. IIRC, what’s up there is one vac line straight from the manifold, one line from the connections on the IP, and one going to the EGR. Those could all be removed.

The rest of your system should follow the diagrams available here and elsewhere. Body consumers include the two yellow lines for locks, green for hvac, brown for shutoff and one more. Engine and trans consumers go to one of two spots on the IP, and a black tube that goes to the AT.

Start getting rid of golf tees and move to basic splitters/junctions...
__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)
Reply With Quote
  #6  
Old 07-02-2019, 02:30 AM
Registered User
 
Join Date: Sep 2004
Posts: 8,971
Quote:
Originally Posted by NZScott View Post
And how much vacuum is an inch of vacuum?

It depends on the size of the container. It's really confusing, because a small container can hold more inches of vacuum than a larger container. And the more vacuum you squeeze into a container, the less it weighs. But it's hard to find vacuum that's much over two feet long. (That's why you seldom hear about a yard of vacuum.)
__________________
When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl.
Reply With Quote
  #7  
Old 07-02-2019, 03:20 AM
Registered User
 
Join Date: Jun 2019
Posts: 66
Quote:
Originally Posted by tangofox007 View Post
None of which has any connection to the vacuum system.
Are you saying it’s connected wrong or that it has nothing to do with vacuum lines?

I’m just trying to get my car ready for a 4 hour road trip. Not concerned with locks/AC.

My brown connectors are fine. Car shuts off 1 second after removing key from ignition.

Quote:
Originally Posted by JHZR2 View Post
If you’re concerned with the mess on the VC, have a look at a vac diagram. IIRC, what’s up there is one vac line straight from the manifold, one line from the connections on the IP, and one going to the EGR. Those could all be removed.

The rest of your system should follow the diagrams available here and elsewhere. Body consumers include the two yellow lines for locks, green for hvac, brown for shutoff and one more. Engine and trans consumers go to one of two spots on the IP, and a black tube that goes to the AT.

Start getting rid of golf tees and move to basic splitters/junctions...
The diagrams I find are just diagrams with labeled components but lack a Legend explaining those labels. I’ve found plenty on google but they are routed to the 5way connector on top of the valve cover, which makes it confusing.

Thanks for the replies. I’ll get to work cleaning it up. Just wanted to make sure my vacuum to the transmission and IP was okay.

I’m still new to navigating this site. I might not be looking correctly.

Last edited by Wusha; 07-02-2019 at 03:32 AM.
Reply With Quote
  #8  
Old 07-02-2019, 08:07 AM
Registered User
 
Join Date: Sep 2004
Posts: 8,971
Quote:
Originally Posted by Wusha View Post
Are you saying it’s connected wrong or that it has nothing to do with vacuum lines?
It has nothing to do with vacuum system; it transmits manifold pressure to the ALDA.
__________________
When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl.
Reply With Quote
  #9  
Old 07-02-2019, 08:33 AM
JHZR2's Avatar
Registered User
 
Join Date: Jan 2002
Location: New Jersey
Posts: 5,265
Quote:
Originally Posted by Wusha View Post
Are you saying it’s connected wrong or that it has nothing to do with vacuum lines?

I’m just trying to get my car ready for a 4 hour road trip. Not concerned with locks/AC.

My brown connectors are fine. Car shuts off 1 second after removing key from ignition.



The diagrams I find are just diagrams with labeled components but lack a Legend explaining those labels. I’ve found plenty on google but they are routed to the 5way connector on top of the valve cover, which makes it confusing.

Thanks for the replies. I’ll get to work cleaning it up. Just wanted to make sure my vacuum to the transmission and IP was okay.

I’m still new to navigating this site. I might not be looking correctly.
Over boost relay has everything to do with prot citing against too much boost, overfueling/temp, and engine damage. Boost and vac are two different systems used for two different purposes.

It sure what kind of legend you’re looking for. There are reasonable-quality vac diagrams available here and elsewhere on the web. Startek is free for FSMs as well. There is a ton of info and some folks have tried to organize it a bit into threads, you just need to beware that there are lots of different vacuum routing schemes, and some have transmission related vacuum router through the valves on the top of the valve cover (4-5 hoses on those iirc), while others have just three.
__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)
Reply With Quote
  #10  
Old 07-02-2019, 09:36 AM
Registered User
 
Join Date: Jun 2019
Posts: 66
Quote:
Originally Posted by tangofox007 View Post
It has nothing to do with vacuum system; it transmits manifold pressure to the ALDA.
Ok, I should have renamed my title better. I included it because my previous N/A
cars manifold would generate vacuum and had “vacuum leaks”. But I’ve never had a turbo.
Thanks for clearing that up.

Quote:
Originally Posted by JHZR2 View Post
Over boost relay has everything to do with prot citing against too much boost, overfueling/temp, and engine damage. Boost and vac are two different systems used for two different purposes.

It sure what kind of legend you’re looking for. There are reasonable-quality vac diagrams available here and elsewhere on the web. Startek is free for FSMs as well. There is a ton of info and some folks have tried to organize it a bit into threads, you just need to beware that there are lots of different vacuum routing schemes, and some have transmission related vacuum router through the valves on the top of the valve cover (4-5 hoses on those iirc), while others have just three.
Looking into startek, thanks for the info.

And yes, boost is different than vacuum and something I need to understand better.
Reply With Quote
  #11  
Old 07-07-2019, 12:31 AM
Registered User
 
Join Date: Aug 2010
Location: Sacramento, CA
Posts: 3,115
Some German translations for items are a bit confusing. What most in the U.S. would term a "vacuum switch", M-B terms "switch-over valve". Their word "druck" for "pressure" slips into terms. The "hot-water solenoid valve" for the cabin heater is termed "mono-valve" (perhaps there was a duo-function valve once?). If remove the emission controls part of the vacuum system, that eliminates ~50% of the components, at least in my 1984 & 85. There is a diagram posted many times here. Be careful not to lose the positions of the several small plastic bleeds (orifices) which are stuffed in the vacuum tees. Those are needed to control transmission shifting correctly and such.

Your emissions controls probably don't work anymore, so removing them may make the engine run better and pollute less. They were to reduce NOx emissions, which are a minor concern today (smog). The current concern is CO2 emissions (global climate change), so maximizing mpg reduces that. If you fill w/ bio-diesel, you emit no "net CO2" so optimal. It is widely available now in CA (Propel & Union 76 stations).

__________________
1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans
Reply With Quote
Reply

Bookmarks

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




All times are GMT -4. The time now is 07:21 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page