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#1
11-19-2010, 04:04 PM
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1980 vacuum routing
Hi folks, I am looking for input from other 1980 w123 300d/td/cd owners on whether this vacuum diagram reflects the reality of how their cars' vacuum lines are connected up.
Background: this discussion began with another thread that concerned my 1980 300td tranny that won't upshift from second. I've had a short crash course in the wonders of the 1980-only, vacuum-control-only transmission. In any case, I found this 1980 vacuum diagram through a link in a sticky thread here. It's from the Peter Schmid Transmissions site. As I see it, it does NOT reflect the reality of how the vacuum on my car is currently plumbed. I'd like to get input from others.... Thx
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 Mac 2002 e320 4matic estate│1985 300d│1980 300td Previous: 1979 & 1982 & 1983 300sd │ 1982 240d “Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22 
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#2
11-21-2010, 01:11 PM
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BUMP; surely someone out there has an '80 in their driveway
__________________
Mac 2002 e320 4matic estate│1985 300d│1980 300td Previous: 1979 & 1982 & 1983 300sd │ 1982 240d “Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22
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#4
11-21-2010, 02:37 PM
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Mine's an 81, but that doesn't look familiar. (Sort of, but not totally). I'm subscribing to your post, because I'm having the same problem as of a few days ago.
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"Knowing is not enough, we must apply. Willing is not enough, we must do." Goethe *********************************** 1951 Chevy 3100 2003 Indian Chief Roadmaster 1983 GMC 1 ton Dually 1982 Chevy 1 ton Dually, service body (sold) '90 GMC Suburban 6.2 "SS Veg-Burban" (single tank WVO\diesel conversion) SOLD '81 300D ~ Mama's car...my job (now my car)(but still my job) SOLD '83 300sd ~ rescue car SOLD 2005 Ford Taurus (Mama's new car)(NOT my job!)
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#5
11-21-2010, 05:57 PM
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Could you post pics of your set up?
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83 SD 84 CD
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#6
11-21-2010, 05:59 PM
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Well ;
I have a 1980 30CD and it's like this , when it stopped up shifting into 4th gear I chased all the leaky rubber hose bits before it gave up entirely , I drove it (slowly) in 3rd. gear to my indy Merz guy who adjusted first the 3/4 band on the tranny (threads on this about here) then he re-adjusted the valve on the IP and it began shifting again , as it leaks a tiny bit and doesn't bang through the gears like my 300CD does I'm not 100 % happy but it does work O.K. when connected like this and adjusted to the vacuum drops off to _zero_ as you depress the throttle .
It's been several years now and many many long distance trps over mountains etc. fully loaded down with 5 adlts & luggage and shifts the same... I hope this helps .
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-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better
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#7
11-21-2010, 11:53 PM
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longtime 1980 owner
I had a poor shift problem for a very long time in my 1980.
Everything you said about the only-on-1980 vacuum controlled trans is true. My problem ended up being a leaky 2/3 valve on the valve cover that controls the vacuum. Until this forum, and ten years of poor shifting, I did not figure this out. After replacing the trans, and the problem persisted I got serious and tracked down this little valve. I now own spares and several little lever/arms bought here from fastlane. On my 1983 I ditched/removed the 2/3 valves completely, but not on the 1980. Also, getting enough vacuum to the trans. Moving the line closer and closer to the pump on the main feedline to get stronger vacuum. My 1980 now shifts beautifully. I hope I understood your problem correctly and made sense.
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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
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#9
11-22-2010, 09:35 PM
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Pics
Quote:
__________________
Mac 2002 e320 4matic estate│1985 300d│1980 300td Previous: 1979 & 1982 & 1983 300sd │ 1982 240d “Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22
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#10
11-22-2010, 10:23 PM
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If I am understanding the diagram correctly, the tranny is taking its vacuum from a looped line that runs to the 2/3 switch and then on to the tranny. The third port of the switch is capped. The line on the other side of the switch goes to the vacuum control valve.
On my car, the orfice showing capped in the diagram is the one getting the feed off the main line. The line beside it (black) goes to the tranny. The other side (red/black) goes to the VCV.
__________________
Mac 2002 e320 4matic estate│1985 300d│1980 300td Previous: 1979 & 1982 & 1983 300sd │ 1982 240d “Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22
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#11
11-23-2010, 01:50 AM
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Nice pictures. I will take some tomorrow morning of my 1980 valve cover so
you can see. The car shifts great so I consider it proper. If you have to remove one of the lines we need to figure out why it is there and re-route or plug as needed. Now, another thing is, do you have the vacuum pump tool for testing the existing valve ? To see if it leaks. It may not leak at all. But it helps to know. They do not cost much. (the 2/3 valve or the tool....). Anyway, get to you in the morning. My last thought is that a station wagon 1980 may have some reason for that line being on the valve. But I hope not as it will make this easier.
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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
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#12
11-23-2010, 09:59 AM
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This is the closest set up I can find, hopefully, it'll help.
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83 SD 84 CD
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#13
11-23-2010, 10:05 AM
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I have an 80 td parts car that's unmolested so far. lemme know if you need anything pics or parts...
also, I notice you have a vacuum line off in one of your pictures. the yellow ball looking part near the firewall has a hose off...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#14
11-23-2010, 03:07 PM
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Thanks for the info about the parts car.... I did notice that line off after I took the pic
__________________
Mac 2002 e320 4matic estate│1985 300d│1980 300td Previous: 1979 & 1982 & 1983 300sd │ 1982 240d “Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22
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#15
11-23-2010, 03:11 PM
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Quote:
This almost looks like rearranging the vac lines each model year was the running joke in the Engineering Dept.... Your diagram looks absolutely inexplicable to me. Is it from an '80??? Thanks for the input everyone.
__________________
Mac 2002 e320 4matic estate│1985 300d│1980 300td Previous: 1979 & 1982 & 1983 300sd │ 1982 240d “Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22
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