Parts Catalog Accessories Catalog Tech Info Tech Forums
  Search our site:    
 Cart  | Project List | Order Status | Help    

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

LinkBack Thread Tools Display Modes
Old 10-17-2003, 08:52 PM
Registered User
Join Date: Jan 2000
Location: Chesapeake, VA
Posts: 396
stevebfl - Upshift delay adjustments

For Steve Brotherton or anyone else. The car is a 1995 C280. I have determined that the vacuum element on the control cable is leaking (therfore no upshift delay and Code P1 700). In a past thread Steve Brotherton advised against a DIY replacement of the cable/vacuum element because the cable needs to be connected inside the transmission and the cable and vacuum element need to be adjusted after installation. I have three questions:

1) How is the connection inside the transmission made? I appears the valve body would have to be removed to do anything inside the transmission. If I remember correctly, the control cable (no vacuum element and earlier transmission, I know) on my '88 300TE could be connected from outside the transmission. I think the cable had some sort of hook that mated with the link from inside the transmission. Could this unit be similar? One thing is certain - there is very little room to work on the C Class.

2) In the past the basic cable adjustment used to be to set the length "free of tension". Is this similar?

3) I assume the upshift adjustment is the nylon socket head screw on the element. What is the criteria for adjustment? I assume it would be to hold the upshift to a certain RPM when cold. What direction should one turn the screw to raise or lower the adjustment?

Thanks in advance.
Reply With Quote
Old 10-20-2003, 06:26 AM
Registered User
Join Date: Jan 2000
Location: Chesapeake, VA
Posts: 396
Thus far I have been able to find the following info:

1) From the 1994 Intro Manual, the diagnostic module looks for 2100 RPM at 26-28 mph. This is in 2nd gear, correct? Seems like a low RPM threshold for 2nd gear. And I assume the adjustment for this is the nylon socket head screw on the vacuum element. Am I correct and which way do you turn it to adjust it?

2) From the Picture Parts Manual, it looks like there is a link coming up from the bellcrank inside the transmission with a 90 degree bend on the end. This is similar to the setup on my old 300TE, if I remember correctly. The question is, does it project high enough to connect the cable from outside the transmission?

Steve, MB DOC, Gilly, Joe P, anybody?
Reply With Quote
Old 10-20-2003, 08:05 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
We replace at least 2-3 cables a week at dealer.
The cable can be replaced W/O removing the valve body, just like earlier cars. Takes 2-3 HRS
On the C-class we always remove the exhaust system.
You need to disconnect the cable from the accel linkage first.

The 2-3 shift must happen between 26-30 MPH for the computer to see the correct RPM.
Adjust the allen counter-clockwise to hold the shift longer(higher RPM)
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
Reply With Quote
Old 10-20-2003, 09:47 AM
Registered User
Join Date: Jan 2000
Location: Chesapeake, VA
Posts: 396
Thanks M.B. DOC! I figured I would drop the exhaust to allow me to drop down the rear of the transmission for better access. I changed the "o" ring on the cable on my old 300TE some years ago - not fun (which is how I am somewhat familiar with the connection of the cable). But the C is much tighter. I figure 2-3 hrs is probably on the lowside for me - I'll just take it easy. Thanks again!
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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 04:44 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page