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
  #16  
Old 08-19-2006, 12:27 PM
Registered User
 
Join Date: Jun 2004
Location: West of Ft. Worth. TX
Posts: 4,186
If you are talking about step #6, you are basically just doing a leak check of the modulator. Sometimes the little black rubber cap, on the modulator, has cracks and needs to be replaced or the modulator itself is leaking.

Steps 7 through 11 are for checking and adjusting the vacuum control valve on the IP. You are looking for vacuum, to the transmission modulator, to drop to nearly zero with full throttle.

From going through this procedure myself, I believe the bowden cable, modulator pressure and vacuum control valve all factor in on the shifting. Until you go through the adjustments, it is hard to tell which one is not working as it should.

__________________
Sam

84 300SD 350K+ miles ( Blue Belle )
Reply With Quote
  #17  
Old 08-19-2006, 09:20 PM
adrenelin500's Avatar
Registered User
 
Join Date: Apr 2006
Location: Newfoundland
Posts: 154
got er done

Thanks blue , I had no vac at the IP at all, blockage right up by the fuse box was to blame. Any idea how you adjust the modulator... as in how much or little vac it should be set to ,or is it a shoot from the hip kind of thing?
Reply With Quote
  #18  
Old 08-21-2006, 11:12 AM
Registered User
 
Join Date: Jun 2004
Location: West of Ft. Worth. TX
Posts: 4,186
Quote:
Originally Posted by adrenelin500 View Post
Thanks blue , I had no vac at the IP at all, blockage right up by the fuse box was to blame. Any idea how you adjust the modulator... as in how much or little vac it should be set to ,or is it a shoot from the hip kind of thing?
The adjustment of the modulator is in the link that I provided you. The modulator is set according to pump pressures of a particular model. From when I replaced mine, I recall the pressure reading should be 40.

But, just tweaking the modulator is not going to resolve this. You need to ensure the vacuum control valve at the IP is set properly. As reported in that link, if rack movement doesn't coincide with the proper range of vacuum, the shifts will either be rough and too soon or result in flaring.

__________________
Sam

84 300SD 350K+ miles ( Blue Belle )
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 02:42 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2021, 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