Thread: How much do these little vacuum orfice have an effect on the transmission?
View Single Post
  #2  
Old 04-11-2021, 03:38 AM
H-townbenzoboy's Avatar
H-townbenzoboy H-townbenzoboy is offline
Now Y2K Compliant
  
Join Date: Jul 2003
Location: Houston, TX
Posts: 4,341
Quote:
Originally Posted by Lenovolost View Post
https://**************.com/store/diesel-automatic-shift-control-valve-vacuum-orifice-set

84 300D. Overhauled the vacuum line/hoses/3 way t's in my car and realized I accidentally threw away these orfices. My car is shifting a little rough. Vacuum is good car shuts off on the dim. I will do a little more digging in the AM. However I just wanted to know do they play a big role in how the transmission works?
See this post It's CRITICAL... how you set your transmission's vacuum system on your diesel MBZ...

I got rid of the orifice when I streamlined my vacuum lines after eliminating the EGR and the associated valves on top of the valve cover of my 1981 300SD. After I saw a photo of the engine of a rare Japanese spec 300SD that came from the factory without the EGR, I noticed the vacuum line didn't have an orifice. The EPC confirmed it for non-EGR 300SDs, so I removed it. My transmission shifts well without the orifice.

Your car may be different. I think later models used more orifices, so eliminating them may result in more dramatic changes to shifting to your 1984 model. How many did you remove?
__________________
'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.
Reply With Quote