![]() |
|
|
|
|
![]() |
|
LinkBack | Thread Tools | Display Modes |
|
#1
|
|||
|
|||
Eureka… re: auto tranny vacuum shift systems… I have P/N(s) for orifices !!!
I’m still struggling with my 1980 300D [na] transmission shifting and not ready to throw in the towel by declaring the tranny hopeless !
I first read on another thread [http://www.peachparts.com/shopforum/attachments/diesel-discussion/32510d1143915823-glorious-orifice-vacuum-sensational-shift-no-flare-123_1.jpg ] I was given help with finding the proper vacuum diagram. Thanks guys! See: http://www.peachparts.com/shopforu...d.php?t=105297 and this link led me to a really good site with diagrams for these vintage vacuum controlled systems… see: http://www.peterschmid.com/vacuum.htm Now for the “Eureka” part of this post. Today I went to the local M-B dealer’s parts counter and the first parts man had no clue when I showed him three of the vacuum orifices together with the diagram clearly showing it. His computer listing system was just of no help. Then they brought out a guy from the back room [a mechanic I think] who had his own personal hand-written list. I canNOT guarantee the accuracy but here is the results below. I think this list starts with the largest and ends with the smallest: Color: P/N: Yellow……..……..1162760929 Red………………….1162761029 Blue…………………1162761129 White………………1162761229 Green………………1162761329 Brown……………..1162761429 [actually I see the brown as burned orange] I’m getting a complete set and will use whichever I need or possibly combination I need to tune the system as per the excellent 2002 article by Steve Brotherton at: http://www.continentalimports.com/ser_ic20242.html I hope this information is helpful to at least one of you out there! Regards, Sam - Novato, CA |
#2
|
|||
|
|||
Quote:
__________________
Ralph 1985 300D Turbo, CA model 248,650 miles and counting... |
#3
|
|||
|
|||
My thanks also.
__________________
80 300D 340K Owned 30 yrs 83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day 02 Z71 Suburban 117,000 15 Toyota Prius 2600 miles 00 Harley Sportster 24k 09 Yamaha R6 03 Ninja 250 |
#4
|
||||
|
||||
Good stuff to know for the slush boxes.
__________________
1981 300D 147k 1998 VW Jetta Tdi 320k 2001 Dodge Ram 2500 141k 1979 300D 234k (sold) 1984 300D "Astor" 262k(sold) Mercedes How-To and Repair Pictorials I love the smell of diesel smoke in my hair ![]() |
#5
|
|||
|
|||
I think the yellow "connector/orifice" is...
just a straight thru connector [ Yellow……..……..1162760929 ].
At present I only have Red, White, and brown/orange while I cool my heals for the dealer [hopefully] gets the other three for me. On the InterNet I could only find the yellow one! I found that the brown/orange reduces the vacuum a bit too much and both red and white not enough... thus my conclusion that one needs to have a full set to have the best chance at getting the proper vacuum balance on the tranny side where the VCV [on the IP] bleed off the vacuum seen by the vacuum modulating valve that sits on the tranny. I see that later models have what is called a vacuum "dashpot" or "damper" on the line going into the VCV. These are cheap and so I might just give this a try as this should slow down and somewhat stabilize the vacuum the tranny sees as you vary the throttle. What do you think? Sam |
#6
|
||||
|
||||
I believe Peter Schmid prefers the green or brown vac orofice, I can't remember which. He also taught me to check the source tee on the vac manifold (running from the brake booster to the vac pump) by inserting and rotating a small drill bit, about a #60, just a little larger than a big sewing needle, in the port that supplys vacuum to the shifter. In many cases dust or soot accumulates in it and transmission shifting will be affected from poor vac supply. Once you have the vac supply checked, tee a vac gauge off the rigid line that goes directly to the trans modulator. In neutral alternately flip the engine RPM between idle and something like 1500 RPM. The vac should swing between a range that will be set by the variable leak on the back of the IP and the leak in the small colored orofices you are going to buy. Chart the two readings, idle and the most vac it reads and write down the performance after some road tests using individual orofices then tell us which one you prefer. Remember if the trans shifts too soft the clutches wear faster. The shift points on the pre-85 diesels is also determined by the drivers foot on the accelerator pedal, the '85 models use a flying saucer vac device to smooth out the trans shifts (and a different transmission altogether).
__________________
'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting! |
![]() |
Bookmarks |
|
|