|
|
|
|
|
#1
07-04-2008, 10:35 AM
|
|||
|
|||
|
What is this blue plastic pancake vacuum can?
I feel like I should know the answer to this, as I've been "into" these Benzes for quite a while. I have converted 2 1987 190D 2.5 Turbo's from automatics into 5-speeds, and on both of them, I have plugged the vacuum line that would normally go to the transmission.
This line originates at a blue plastic "pancake" style cylinder/can that is mounted on the firewall between the engine and the brake booster. I think it has 4 vacuum lines going to/coming from it. I am having some other vacuum problems with my latest conversion, and I suspect that this blue cylinder is part of the problem. If this canister is only for the purpose of controlling the auto trans vacuum signal, I will completely bypass it. (The car has a manual trans now) If it serves other purposes, then I'll do something else. Any help would be appreciated. SteveM.
__________________
'93 190E/D 2.5 Turbodiesel 5-speed (daily driver) '87 190D 2.5 Turbo rustbucket - parts car '84 Dodge Rampage diesel - Land Speed Record Holder '13 Ram 2500 Diesel '05 Toyota 4Runner 
|
|
#2
07-04-2008, 01:33 PM
|
||||
|
||||
|
Couldn't this be a check valve for the vacuum line to the A/T modulator?
__________________
 Don't Chrome them; polish them
|
|
#3
07-04-2008, 02:02 PM
|
||||
|
||||
|
I was told its a vacuum amplifier.
|
|
#4
07-04-2008, 02:35 PM
|
|||
|
|||
|
Amplifier.
I can believe that it might be a vacuum "amp". It's about 3 inches or so in diameter, and has 2 vacuum lines on the top (one clearly marked "Vac", and the other marked "tra" I believe). Then there are 2 more vac lines on the bottom of the device.
There is also a separate check valve, but it is only in the line from this blue device to the tranny. SteveM.
__________________
'93 190E/D 2.5 Turbodiesel 5-speed (daily driver) '87 190D 2.5 Turbo rustbucket - parts car '84 Dodge Rampage diesel - Land Speed Record Holder '13 Ram 2500 Diesel '05 Toyota 4Runner
|
|
#5
07-04-2008, 02:45 PM
|
||||
|
||||
|
its actually a pressure converter
|
|
#6
07-04-2008, 03:08 PM
|
|||
|
|||
|
Any more info?
TheDon:
Any more info? What pressures does it convert? Is it only for the purpose of creating a vacuum signal for the auto trans? SteveM.
__________________
'93 190E/D 2.5 Turbodiesel 5-speed (daily driver) '87 190D 2.5 Turbo rustbucket - parts car '84 Dodge Rampage diesel - Land Speed Record Holder '13 Ram 2500 Diesel '05 Toyota 4Runner
|
|
#7
07-04-2008, 03:20 PM
|
||||
|
||||
|
It combines pressure (turbo boost) and vacuum (from the vacuum pump via the vacuum control valve on the IP) to create a vacuum signal that mimics what the vacuum in a gasser's intake manifold looks like depending on load and throttle position. This allows Mercedes to build one tranny for both gassers and diesels. With a manual transmission you don't need the blue "flying saucer" and can remove it, carefully plugging the appropriate lines to prevent leaks.
__________________
 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
|
|
#8
07-04-2008, 03:24 PM
|
||||
|
||||
|
Check the vacuum diagram sticky. Maybe you can deduce it's function by how the vacuum lines are routed. Should be a similar arrangement in the 86-87 SDL and 87 D/TD if there isn't a 201 diagram.
Sixto 87 300D
|
 |
| Bookmarks |
|
|
Linear Mode
