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#1
11-01-2010, 01:29 AM
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just got my first 240d's! trying to learn vacuum system...
Hi all!
I just got my hands on an 81 240D and started read this forum to learn all about it! got pretty excited bout it, and ended up seeing another '77 240D for next to nothing, so now i have 2  these are my first diesels, and i knew nothing about them before 2 weeks ago-- now, after many late nights of reading this forum.. i feel i have at least a pretty good overview on these beasts!! thank you everyone for this great resource. I am excited to learn about these cars, and see myself having a long relationship with 240Ds! (after owning a 95 camry and 92 volvo, i almost gave up on being able to do any work on them myself.... the W123 seems sooo elegant in design compared to any other car i've owned.)The 81 slips a little when shifting, and i've been reading a lot that the vacuum system is the first thing to check with transmission related issues.. so i'm gonna dive into finding vacuum leaks i am going to order a mityvac to further diagnose-- are there different models, or are all Mityvacs the same? I've been trying to trace vacuum diagrams i see posted around here, but i'm a little confused on what all the parts on the diagrams actually look like on the car...? could you guys help me identify the parts in my photos..?? 
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#2
11-01-2010, 01:43 AM
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I know #5 isn't part of the vacuum system... its the thing that seems to connect the gas pedal to the throttle linkage..?
the black rubber parts seems pretty worn and cracked, and it gives/warps/bends a lot when the pedal is engaged.. does this play affect the performance or anything? ie - should i replace it? the car is quite the slowpoke... which i realize the aren't speed machines, but i am trying to get everything i can at least in order to maximize the power & acceleration.
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#3
11-01-2010, 04:03 AM
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Answer
Quote:
Throttle Bushing - Pivot Mount MB# 123 300 13 40 ..
__________________
ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/
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#4
11-01-2010, 04:19 AM
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Answer
The white plastic valve #2 is in the following thread.
Unobtainium MB Diesel parts List http://www.peachparts.com/shopforum/showthread.php?t=267879
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#5
11-01-2010, 07:32 AM
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Quote:
Originally Posted by wilburtual  I know #5 isn't part of the vacuum system... its the thing that seems to connect the gas pedal to the throttle linkage..? the black rubber parts seems pretty worn and cracked, and it gives/warps/bends a lot when the pedal is engaged.. does this play affect the performance or anything? ie - should i replace it? the car is quite the slowpoke... which i realize the aren't speed machines, but i am trying to get everything i can at least in order to maximize the power & acceleration. That is bad = it will prevent full linkage travel. Throttle Bushing - Pivot Mount MB# 123 300 13 40' As W Hunter, points out, it is most likely bad. I think a $50 part. I have an '81 Manual. Mine was really bad. I could barely do 55 mph, and it took a while to get there. I only had about 1/2 of the throttle travel. Replacing that part will help. Also, the end of the accelerater shaft, there should be two prongs. They fit in a pivoting plate on the fuel pump. Mine has square plastic bushings. check to see if yours does too. Mine where half gone. That also restored full throttle travel. Tom
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#6
11-01-2010, 10:41 AM
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Pic #1 is of the vac lines going inside the cabin. The green one is for the HVAC controls.
Yellow and yellow/gray is for the power lock system. The brown and brown/violet are for the engine shut off. The black line is a vent, it bleeds off vacuum from the VCV before it gets to the transmission.
__________________
83 SD 84 CD
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#7
11-01-2010, 11:38 AM
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I suggest you get help before its too late, Thats just how my addiction started, buy a parts car to fix up #1 then buy another "parts" car to fix up your first "parts" car, start rat holing parts, its an all too common story, quit while you can
__________________
 1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car"
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#8
11-01-2010, 11:45 AM
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Quote:
Not done with the 85 300D and I ran across an 83 300CD. Now where will I put my wife?
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Mike Frederick 1986 300SDL, 240K+ miles 1985 300D KaliKar, 270K+ miles
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#9
11-01-2010, 12:40 PM
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Quote:
__________________
1982 240 D, 308,000 - 321,127 miles (sold) 1982 300 TD,166,500 - 226,000 miles 1998 E 320, 120,000 - 144,000 miles 2005 C 230 K, 26,000 - 77,000 miles (sold)
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#10
11-01-2010, 06:54 PM
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You will find them in the "later" 240Ds, most folks use a little chunk of fuel hose till they get the proper bushings.
__________________
1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car"
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#11
11-03-2010, 05:12 PM
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Quote:
 looks like my throttle bushing pivot mount is pretty toast, I didnt pull it off to see the backside, but the black rubber part bends quite a bit when someone steps in the pedal - it sorta bends a bit then engages moving the linkage.. how do I know if i am getting "full throttle" ? i see a bolt on the side of the IP that seems to limit the amount of travel the linkage has-- and when the pedal is put all the way down to the floor, the linkage does hit that bolt - does that mean i am getting full throttle? does that bolt ever need adjustment? The '77 240D i just picked up has a lot more 'pep' when the gas pedal is pushed than this '81 does.... it just really eases into things even when pedal to the floor. just trying to figure out why, or what to check (it's my girlfriend's car... so its probably a good anti-speeding ticket measure for it to accelerate real slow anyways.....BUT!)
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#12
11-03-2010, 05:14 PM
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Quote:
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#13
11-03-2010, 07:53 PM
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Yes and most connect to something in the cabin.
The brown line is the vacuum supply tot he shut off actuator. Push it back through the large "buss" on the firewall, there should be enough line to reach the ignition switch. Gain access to the ignition switch and plug it back in. The black line is not connected to anything, it draws clean air in to "bleed" off vacuum for the transmission.
__________________
83 SD 84 CD
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#14
11-03-2010, 11:58 PM
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[QUOTE=wilburtual;2578354]hmmmm, so thats why i have an unending urge to browse craigslist and look at 240Ds.... ! i'm sure my lady wouldnt mind a parts car on the lawn.....
Yah, such things have been known to cause marital strife, all of my parts cars are out of sight, at least too the casual observer. 
__________________
1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car"
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