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 05-07-2009, 03:42 PM
Registered User
 
Join Date: Apr 2009
Posts: 4
Is dieselgiant wrong?

I've recently bought a very stock, very nice '84 300D. I'm interested- in what seems like a consensus- with the elimination of the two lines that feed vacuum to the black, two-lever switch box located on top of the valve cover.
Now, there seems to be conflicting info here- I read here that this device has nothing to do with the proper operation (shift points, smoothness) of the AT, being only part of the lame US EGR system.
However, reading DieselGiant' s instructions, I'm told that this valve/ lever device has everything to do with the AT's operation... Am I missing something?

Thanks for your advice
Will
Reply With Quote
  #2  
Old 05-07-2009, 03:56 PM
oldsinner111's Avatar
love all animals
 
Join Date: Nov 2008
Location: bristol,tn
Posts: 5,410
Yes they do.But I got rid of them,and run line to 3 way conector,one end plugs on the vac modulator on injection pump,the other the vac line from transmission goes in.Egr is the worse thing for diesels.
__________________
usaf vet
Reply With Quote
  #3  
Old 05-07-2009, 04:10 PM
toomany MBZ's Avatar
Registered User
 
Join Date: Nov 2006
Location: central Va
Posts: 7,820
I have removed or completely bypassed the egr system on every MB diesel I've owned. DG may run into legal issues were they/him to mention otherwise.
In the pic you may be able to see my switchover valve is bypassed also.
Attached Thumbnails
Is dieselgiant wrong?-img_1671.jpg  
__________________
83 SD

84 CD
Reply With Quote
  #4  
Old 05-07-2009, 04:24 PM
Registered User
 
Join Date: Apr 2009
Posts: 4
I certainly like the cleaned-up appearance you have there.

Do you have an official MB part number for the white- colored plug next to the firewall?



(Kidding)


thanks for your help
Reply With Quote
  #5  
Old 05-07-2009, 05:02 PM
Registered User
 
Join Date: Sep 2004
Posts: 8,679
Quote:
Originally Posted by sisu64 View Post
However, reading DieselGiant' s instructions, I'm told that this valve/ lever device has everything to do with the AT's operation... Am I missing something?
That is a seemingly common misconception. The purpose of the valves is to operate the EGR valves. However, if the valves leak, the operation of the transmission can be affected. So, folks replace the valves, then the transmission shifts better. So they conclude that the valves operate the transmission. (This applies to the subject vehicle; other models are different.)
Reply With Quote
  #6  
Old 05-07-2009, 06:42 PM
Bajaman's Avatar
Registered User
 
Join Date: Mar 2005
Location: Bern, Switzerland
Posts: 713
I thought it also had something to do with softening the shift while cold but that is really just speculation.
__________________
For Sale: 1982 MB 300TD
1995 Chevrolet Suburban 6.5TD

Sold: 1980 IH Scout Traveler- Nissan SD33T Diesel
Reply With Quote
  #7  
Old 05-07-2009, 06:55 PM
Registered User
 
Join Date: Apr 2009
Location: Martinez
Posts: 67
Quote:
Originally Posted by toomany MBZ View Post
I have removed or completely bypassed the egr system on every MB diesel I've owned. DG may run into legal issues were they/him to mention otherwise.
In the pic you may be able to see my switchover valve is bypassed also.

Is that the electrical switch that is usually mounted on top of the camshaft cover?
What its purpose?
__________________
Current Rides:

2004 BMW R1150GS Adventure
2005 MB W211 E320 Cdi
Reply With Quote
  #8  
Old 05-07-2009, 08:25 PM
ForcedInduction
Guest
 
Posts: n/a
DG means that if the valves are leaking they can have a big impact on transmission performance. Working normal or removed, they have no impact on the transmission.
Reply With Quote
  #9  
Old 05-07-2009, 11:36 PM
Inna-propriate-da-vida
 
Join Date: May 2008
Posts: 1,895
Quote:
Originally Posted by tangofox007 View Post
That is a seemingly common misconception. The purpose of the valves is to operate the EGR valves. However, if the valves leak, the operation of the transmission can be affected. So, folks replace the valves, then the transmission shifts better. So they conclude that the valves operate the transmission. (This applies to the subject vehicle; other models are different.)
What he said. Mine leaked, and after removal, shifts got better.
__________________
On some nights I still believe that a car with the fuel gauge on empty can run about fifty more miles if you have the right music very loud on the radio. - HST

1983 300SD - 305000
1984 Toyota Landcruiser - 190000
1994 GMC Jimmy - 203000

https://media.giphy.com/media/X3nnss8PAj5aU/giphy.gif
Reply With Quote
  #10  
Old 05-08-2009, 12:33 AM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Quote:
Originally Posted by tangofox007 View Post
That is a seemingly common misconception. The purpose of the valves is to operate the EGR valves. However, if the valves leak, the operation of the transmission can be affected. So, folks replace the valves, then the transmission shifts better. So they conclude that the valves operate the transmission. (This applies to the subject vehicle; other models are different.)
Exactly.
Reply With Quote
  #11  
Old 05-08-2009, 12:41 AM
dieseldan44's Avatar
Registered User
 
Join Date: Nov 2006
Location: Boston
Posts: 2,036
Quote:
Originally Posted by Bajaman View Post
I thought it also had something to do with softening the shift while cold but that is really just speculation.
For W123's, only on the 84 CA and the 85 Federal / CA are there any provisions for shifting performance adjusting with temperature. they are designed to shift softer when cold.

dd
__________________
-------------------------------
'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car
Reply With Quote
  #12  
Old 05-08-2009, 02:10 AM
Registered User
 
Join Date: Aug 2006
Location: London, Ontario, Canada
Posts: 543
I have run without the valve for years with no issues with my trannys.
__________________
1984 Euro 300SDC, (4spd standard)
1986 Toyota Landcruiser Diesel HJ60 5spd X2

Gone but not forgotten (some sold, some stripped)
1983 300 SD, 1985 300 SD, 1983 240D, 1986 300 SDL, 1985 300 SDL, 1983 300 D, 1984 300 D, 1985 300SD, 1987 300 SDL, 1983 300 SD, 1985 300 TD Euro, 1983 380SEC, 1990 300 D, 1987 300D, 1982 300D, 1982 300D, 1994 E420, 1987 300 TD, 1987 300 D, 1984 300 D
Reply With Quote
  #13  
Old 05-08-2009, 03:14 AM
ForcedInduction
Guest
 
Posts: n/a
The 240D is the only one that the valve on the valvecover affects the transmission.
Reply With Quote
  #14  
Old 05-08-2009, 07:58 AM
toomany MBZ's Avatar
Registered User
 
Join Date: Nov 2006
Location: central Va
Posts: 7,820
Quote:
Originally Posted by bart_dood View Post
Is that the electrical switch that is usually mounted on top of the camshaft cover?
What its purpose?
I think you're confusing the black box on the cam cover as being electrical, it is not, just vac lines going to it.
The switchover valve is located on the first firewall, the pic shows a new hard line from the manifold to the switch over valve, I have just bypassed it on this car yesterday, and am going to take it for a drive to see if there is any difference. The one on my CD has always been bypassed.
Attached Thumbnails
Is dieselgiant wrong?-next-smallest-file-vac-line.jpg  
__________________
83 SD

84 CD
Reply With Quote
  #15  
Old 05-08-2009, 10:00 AM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,292
Quote:
Originally Posted by bart_dood View Post
Is that the electrical switch that is usually mounted on top of the camshaft cover?
What its purpose?
your 85 has an electrical switch here, because the EGR is controlled electronically.

Quote:
Originally Posted by toomany MBZ View Post
I think you're confusing the black box on the cam cover as being electrical, it is not, just vac lines going to it.
The switchover valve is located on the first firewall, the pic shows a new hard line from the manifold to the switch over valve, I have just bypassed it on this car yesterday, and am going to take it for a drive to see if there is any difference. The one on my CD has always been bypassed.
see my answer above... he has an 85... it's different from all the other years.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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 08:51 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, 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