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 06-05-2008, 07:36 PM
Registered User
 
Join Date: Sep 2007
Location: Redmond, WA
Posts: 622
25 mmHg to my transmission, what?

I've been having some vacuum related transmission issues for a long time. I start off in 2nd gear and can't kickdown unless I manually move the lever. That's fine, I'll deal with that later.

But, I'm in 4th gear by 25 mph -- my car never has a chance to get into its power band and get moving, and the 63 horses in my '83 240D need all the help they can get.

I dug out a vacuum diagram and looked at the connections. I've removed and plugged the single line going from the top of the valve cover to the EGR hardware, but it looks like the previous owner did something screwy, because I'm missing an entire "T" connector and an "oriface" of some sort.

I put my MityVac on a "T" between the valve cover and the transmission modulator and it registered 25 in.Hg. at idle. ForcedInduction has mentioned it should be closer to 8-10 inHg. I didn't even bother to check the VCV operation.

Does anyone know what part #s for orifaces are supposed to be? I'm about to go crazy about this.
__________________
1983 Mercedes-Benz 240D
Automatic, A/C, Power Sunroof, Power Right Side Mirror
231K Miles FOR SALE MAKE OFFER
Reply With Quote
  #2  
Old 06-05-2008, 07:37 PM
79Mercy's Avatar
Registered User
 
Join Date: Mar 2008
Location: Florida
Posts: 4,128
Replace the green vacuum valve.
__________________
1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
Reply With Quote
  #3  
Old 06-05-2008, 08:06 PM
Jeremy5848's Avatar
Registered Biodiesel User
 
Join Date: Mar 2006
Location: Sonoma Wine Country
Posts: 8,394
Orifice

Vacuum system orifices
Color: I.D. P/N:
Yellow 2.0 mm 1162760929
Red 1.1 mm 1162761029
Blue 1.0 mm 1162761129
White 0.8 mm 1162761229
Green 0.7 mm 1162761329
Brown 0.9mm 1162761429
__________________

"Buster" in the '95

Our all-biodiesel family
1995 E300D (W124) . .239,000 miles My car
1996 E300D (W210) . .313,000 miles Wife's car
Santa Rosa population 170,685 (2012)
Total. . . . . . . . . . . . 722,685
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
Reply With Quote
  #4  
Old 06-05-2008, 08:11 PM
Registered User
 
Join Date: Sep 2007
Location: Redmond, WA
Posts: 622
Quote:
Originally Posted by Jeremy5848 View Post
Vacuum system orifices
Color: I.D. P/N:
Yellow 2.0 mm 1162760929
Red 1.1 mm 1162761029
Blue 1.0 mm 1162761129
White 0.8 mm 1162761229
Green 0.7 mm 1162761329
Brown 0.9mm 1162761429
Thanks, that's what I was looking for.

I almost want to do a 4sp conversion just to save myself the trouble.
__________________
1983 Mercedes-Benz 240D
Automatic, A/C, Power Sunroof, Power Right Side Mirror
231K Miles FOR SALE MAKE OFFER
Reply With Quote
  #5  
Old 06-05-2008, 08:17 PM
johnathan1's Avatar
Registered User
 
Join Date: Feb 2008
Location: Downey, SoCal
Posts: 1,183
Quote:
Originally Posted by jkoebel View Post
I almost want to do a 4sp conversion just to save myself the trouble.

LOL...because that's SO much easier than replacing a couple of vacuum components... :p
__________________
Current cars:
2000 ML55 AMG, 163k miles
1998 E430 Sport, 326k miles
1995 S320, 202k Miles
Reply With Quote
  #6  
Old 06-06-2008, 12:55 AM
Registered Hack
 
Join Date: Mar 2008
Posts: 4,612
If there are orifices missing you could have vacuum surplus in the wrong places.

They restrict flow and help direct vacuum to required areas.
__________________

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 06:44 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