AA,

You don't need to take the doors apart. You really should invest in the CD or 2 part manual for the 123 chassis. Things like the vacuum system are all laid out. The vacuum system is under group 80.

Peter

__________________
Auto Zentral Ltd.

Use can use the search facility here to find a post of mine a couple months ago describing the vacuum system in pretty good detail. Yes, I could find it for you, but it's better if you learn how to use the search for yourself.

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Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References

Chances are about 90% that you dislodged a vacuum fitting or broke a vacuum line sometime during the process of working on the hydraulic system. They are very vulnerable under the hood so at first I would just look around at the vacuum lines on the left hand side of the engine and see if you can see one disconnected. It could save you a lot of troubleshooting time. If you were working near vacuum lines when replacing the accumulators, look and see if you dislodged something there.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

There is also a shut-off valve at the ignition which you can pick up at the dealer for $30. I had to replace them both.

__________________
85 300CD Signal Red/Tan sold
83 300D Manganese Brown 109K
97 E420 Midnight Blue 197K sold
98 BMW 328i Vert White 100K, sold
95 BMW 525i White 125K, sold
93 BMW 525iT Red 193K, sold
95 E320 Green Wagon 125K, sold
94 E320 White 127K, sold
85 300SD 156K Grey (Annie), sold
84 300D Lapis Blue 170K (Judy), sold
99 ML 320 Black (lease), 1998 C230 White (lease)
00 Honda S2000 Red (lease)
86 Mercedes 300E (sold)
84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold)

Rick,
I found your write-up on the 240 vacuum system, and along the way I also found lots of other info you've posted - seems like you're mastered in vacuum system! I'll go through that info and see how it goes. Thanks!

AA

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'82 300TD
'77 6.9
'75 280S
'74 280
'87 Porsche 944 turbo

did you have to get a new key with your new ignition switch, thus having to use 2 keys for the car? Where exactly is it located, how do i remove it? I recently replaced the shut-off valve in the IP and the car still wont shut off, i suspect the ignition switch is leaking vacuum.

No, you don't need a new key. You take out the instrument panel and the valve is behind the key switch. It's very tight in there, but you replace it the Vacuum Valve At Steering Lock.

__________________
85 300CD Signal Red/Tan sold
83 300D Manganese Brown 109K
97 E420 Midnight Blue 197K sold
98 BMW 328i Vert White 100K, sold
95 BMW 525i White 125K, sold
93 BMW 525iT Red 193K, sold
95 E320 Green Wagon 125K, sold
94 E320 White 127K, sold
85 300SD 156K Grey (Annie), sold
84 300D Lapis Blue 170K (Judy), sold
99 ML 320 Black (lease), 1998 C230 White (lease)
00 Honda S2000 Red (lease)
86 Mercedes 300E (sold)
84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold)

Make sure you reconnect the two lines in the correct order or you will have vacuum problems. One of those lines has a blue stripe.

Peter

__________________
Auto Zentral Ltd.

In my 84300DT the Oil Filter housing is in the way, can you re & re the Shut Off valve without removing the IP?

remove the transmission vacuum modulator, taking care not to break the plastic band that holds the linkage together, and then you have access to the bolts that hold the plate over the shut off valve. you can get to it with the oil filter housing there.

Peter:

As a precaution in case of a "runaway engine" can I disconnect the fuel line at the Pre-Filter connection hence starving the engine of fuel in the event of a runaway engine. Will this work? Or will there be enough diesel on the line to cause engine damage?

There will be enough diesel in the lines to do harm. The best way to do it is to have the air cleaner stuff removed down to the turbo with a board ready. When this happened to me, I used a DVD case and the engine was shut off in less than 5 seconds....scary 5 seconds for sure. definitely cleaned out the system though (not that I recommend this method)