83CD Tranni Vacuum help needed - PeachParts Mercedes-Benz Forum

Alec300SD · #2 04-06-2017, 10:28 PM

Quote:

Originally Posted by bigsky

Bought a 83CD last week, have been looking for a turbo. Picked up the 83 with new MB installed motor 20K miles ago. Motor runs great, but tranni has vary hard shifts. Replaced tranni filter/fluid, made shifts a little more consistent. Also did diesel purge on IP. Today started tracing vacuum/lines. Found that I do not have any vacuum going to tranni. Traced lines to the 2, 3/2 valves on top of valve cover, and found that two of the lines were broke off. Questions:

1: Have done much research, and it looks like many just delete this whole setup, should I delete it, and if so where can I find a good write up??

2: Should I just order the new 3/2 valves and get it running/shifting correctly before doing EGR delete?

3: The 3/2 valve set up on the valve cover, uses 4 vacuum ports, but I only have 3 vacuum lines going to it. Am I missing a vacuum line some where??

Tried to upload Pic, but failed

Congrats on the new acquisition

Vacuum from the VCV atop the rear of the IP regulates downshifts.
The bodwen cable regulates the upshifts.
This thread should help: http://www.peachparts.com/shopforum/diesel-discussion/158216-its-critical-how-you-set-your-transmissions-vacuum-system-your-diesel-mbz.html
I used a drip irrigation needle valve to have a on-the-fly adjustable vacuum orifice instead of trying to hunt down different sized color-coded MB vacuum orifices.

1) Yes, it's not a complete DIY write up...but take a look at the EGR delete pdf in the linked thread. http://www.peachparts.com/shopforum/diesel-discussion/385092-mystery-solved-egr-switchover-valve-causes-throttle-linkage-binding.html

2) No, the switchover valves only affect the EGR valve operation (under different load conditions).
If the EGR is deleted, also delete the switchover valves.

3) No, only three lines connect to the intermediate piece (item 74) on the EGR - Engine system vacuum jpg in the linked thread. (First photo)