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 11-05-2013, 08:03 PM
Registered User
 
Join Date: Nov 2012
Location: Mesa, Arizona
Posts: 1,720
Mercedes Part Number 001 510 70 97

Is this the fuel enrichment relay? When I was younger wasn't understanding what I was doing, so now that I have to button up the anti-sway bar task, figure best to understand what does what.

How does the fuel enrichment work?

E.G.R. and the wheel well relays eliminated as leaked badly and N.L.A. to my knowledge. But, hopefully didn't do something wrong...

Attached Thumbnails
Mercedes Part Number 001 510 70 97-img_20131105_165107_757%5B1%5D.jpg  
__________________
Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.
Reply With Quote
  #2  
Old 11-05-2013, 10:25 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,806
Fuel enrichment relay in an '85 TD? IIRC fuel enrichment is mechanical with a vacuum switchover valve in the circuit to cut the boost signal to the fuel [de]enrichment device.

As to how it works, there's a device atop the IP called the ALDA. Absent a boost signal from the intake manifold, the ALDA presses down on a plunger in the IP to restrict fuel to about as much as a naturally aspirated engine can handle. As manifold boost builds, a boost signal is piped to the ALDA which responds by releasing pressure on the IP plunger, allowing more fuel in relation to a denser air charge into the cylinders. The overboost circuit has a 1.0-1.1 bar switch in manifold. At the setpoint, presumably because the turbo has lost its ability to limit to boost to levels safe for the engine, the switch completes a solenoid circuit within the switchover valve to cut the boost signal to the ALDA. The engine is essentially limited to it's naturally aspirated equivalent's fuel supply until manifold pressure drops below the overboost setpoint.

Sixto
87 300D
Reply With Quote
  #3  
Old 11-05-2013, 10:44 PM
Registered User
 
Join Date: Nov 2012
Location: Mesa, Arizona
Posts: 1,720
Quote:
Originally Posted by sixto View Post
Fuel enrichment relay in an '85 TD? IIRC fuel enrichment is mechanical with a vacuum switchover valve in the circuit to cut the boost signal to the fuel [de]enrichment device.

As to how it works, there's a device atop the IP called the ALDA. Absent a boost signal from the intake manifold, the ALDA presses down on a plunger in the IP to restrict fuel to about as much as a naturally aspirated engine can handle. As manifold boost builds, a boost signal is piped to the ALDA which responds by releasing pressure on the IP plunger, allowing more fuel in relation to a denser air charge into the cylinders. The overboost circuit has a 1.0-1.1 bar switch in manifold. At the setpoint, presumably because the turbo has lost its ability to limit to boost to levels safe for the engine, the switch completes a solenoid circuit within the switchover valve to cut the boost signal to the ALDA. The engine is essentially limited to it's naturally aspirated equivalent's fuel supply until manifold pressure drops below the overboost setpoint.

Sixto
87 300D
Sixto, THANK YOU SO VERY MUCH!

I do not have an A.L.D.A. as was broke when I bought the Mercedes (would not hold vacuum and the screws are corroded into the hosing). Figured I didn't need it, but the more that I know, the more I disagree with those that say fine to run without. Trouble is finding one that holds vacuum or can be repaired.

Very few on here can or able to answer questions, so had to make my own path. I might be further along if I had more help, but at the same time feel retaining more by making the mistakes. Thus why I did some things wrong that need correcting.

So, what is this part mounted to the firewall? Looks hooked into the transmission system.

I found the one I was looking for by looking up the A.L.D.A., so will get that addressed.
__________________
Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.
Reply With Quote
  #4  
Old 11-05-2013, 11:07 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,806
Do you mean the ALDA is off the IP or the ALDA is on the IP but not functioning?

ALDAs aren't subject to vacuum but to pressure. You might in fact damage an ALDA by applying a vacuum to determine if it's intact. Instead, apply pressure and look for nothing more than a slow leak. Any ALDA from '78 through '95 should work on your car so there's a wide range of seconds for you.

I'm not familiar with the '85 TD but I don't think the firewall switchover valve has anything to do with the transmission. Could it be you see a line from the switchover valve splitting with one branch going to the ALDA and the other to the transmission vacuum amplifier? From '86 there's a temperature switch and switchover valve attached to the transmission vacuum amplifier. Maybe '85s have it as well.

Sixto
87 300D
Reply With Quote
  #5  
Old 11-05-2013, 11:29 PM
Registered User
 
Join Date: Nov 2012
Location: Mesa, Arizona
Posts: 1,720
Quote:
Originally Posted by sixto View Post
Do you mean the ALDA is off the IP or the ALDA is on the IP but not functioning?

ALDAs aren't subject to vacuum but to pressure. You might in fact damage an ALDA by applying a vacuum to determine if it's intact. Instead, apply pressure and look for nothing more than a slow leak. Any ALDA from '78 through '95 should work on your car so there's a wide range of seconds for you.

I'm not familiar with the '85 TD but I don't think the firewall switchover valve has anything to do with the transmission. Could it be you see a line from the switchover valve splitting with one branch going to the ALDA and the other to the transmission vacuum amplifier? From '86 there's a temperature switch and switchover valve attached to the transmission vacuum amplifier. Maybe '85s have it as well.

Sixto
87 300D
Sixto, thank you so very much!

Well, I remember I did get help on testing and failed; bet it was pressure. My tester is my mouth and have used it many times working on the Volkswagen (vacuum based F.I.). Don't think I could suck hard enough to do damage?

Who can help?

The first two show a black with red and black with green that tee in after the first vacuum buffer; the green thing that I forgot the proper name for...

The third is the fuel enrichment.
Attached Thumbnails
Mercedes Part Number 001 510 70 97-img_20131105_201808_617%5B1%5D.jpg   Mercedes Part Number 001 510 70 97-img_20131105_201855_425%5B1%5D.jpg   Mercedes Part Number 001 510 70 97-img_20131105_202046_562%5B1%5D.jpg  
__________________
Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.
Reply With Quote
  #6  
Old 11-06-2013, 01:16 AM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,806
This might help - Vacuum Devices, '85 300D-T

Mind the vintage. A lot of links don't work anymore.

Sixto
87 300D
Reply With Quote
  #7  
Old 11-06-2013, 02:37 AM
Zacharias's Avatar
Not so amused
 
Join Date: Apr 2010
Location: West Quebec
Posts: 4,025
Quote:
Originally Posted by Adriel View Post
Is this the fuel enrichment relay?
Where did that come from on the car? I also have an '85 and have never seen that, to my knowledge.
__________________


Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22
Reply With Quote
  #8  
Old 11-06-2013, 01:33 PM
Registered User
 
Join Date: Nov 2012
Location: Mesa, Arizona
Posts: 1,720
Quote:
Originally Posted by Zacharias View Post
Where did that come from on the car? I also have an '85 and have never seen that, to my knowledge.
Zacharias, number 7. http://www.dieselbenz.info/images/vacuum_engine_pp.jpg

One hose goes to the head and another to the A.L.D.A..

My prior post disappeared so...

Sixto, thank you so very much for the thread, but you are right, all its links are dead... Will read Mr. Carlton's post on the transducer, as this mystery part is teed into the line going to it.
__________________
Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.
Reply With Quote
  #9  
Old 11-06-2013, 02:54 PM
Registered User
 
Join Date: Nov 2012
Location: Mesa, Arizona
Posts: 1,720
Looks as if this is number 125 and is a change over valve teeing into the vacuum transducer and A.L.D.A.. Guess another reason to find a working A.L.D.A. ...
__________________
Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.
Reply With Quote
  #10  
Old 11-06-2013, 09:59 PM
Registered User
 
Join Date: Mar 2005
Location: SoCal
Posts: 660
Is it #125 or 126? Its just a regular switchover valve. It is controlled by your over boost switch.
Attached Thumbnails
Mercedes Part Number 001 510 70 97-1985_cal.jpg  
__________________
'85 300D Cal 280,000 miles
'07 C230 37,000 miles
Reply With Quote
  #11  
Old 11-06-2013, 10:27 PM
Registered User
 
Join Date: Nov 2012
Location: Mesa, Arizona
Posts: 1,720
Quote:
Originally Posted by my123ca View Post
Is it #125 or 126? Its just a regular switchover valve. It is controlled by your over boost switch.
Thank you so very much for the reply!

125, as 126 looks to be fuel enrichment spoken of earlier.

Hey, notice you have an 1985 California OM617a. Any chance this weekend you can get a couple pictures of where the vacuum lines go? I see the red strip and the green strip, both black, tee in by the green vacuum device (name still escapes me...), but like to know how the third is hooked up and leads to please.
__________________
Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.
Reply With Quote
  #12  
Old 11-06-2013, 10:42 PM
Registered User
 
Join Date: Mar 2005
Location: SoCal
Posts: 660
Heres a clearer illustration. The lines are color coded.
Attached Thumbnails
Mercedes Part Number 001 510 70 97-egr_california_edited.jpg  
__________________
'85 300D Cal 280,000 miles
'07 C230 37,000 miles
Reply With Quote
  #13  
Old 11-06-2013, 11:00 PM
Registered User
 
Join Date: Nov 2012
Location: Mesa, Arizona
Posts: 1,720
Quote:
Originally Posted by my123ca View Post
Heres a clearer illustration. The lines are color coded.
Wow, thank you so very much!
Clearer, so now can see it was 124! Now I can see I was right that goes into the vacuum transducer. However, still not understanding its function...

__________________
Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.
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 11:05 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, 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