DETAILED Under Hood Pictures of '85 300D Vac lines. Any '85s in Rochester, NY? - Page 3 - PeachParts Mercedes-Benz Forum

Brian Carlton · #31 12-05-2007, 10:20 PM

Quote:

Originally Posted by SGT John

Not even counting the one that is used for the boost, I appear to have 2 switchover valves... (well... had) They were both in the same area, both were connected to a wire, and were both connected by separate vac hoses to the main vacuum line... Did I pull out one of the parts that DO make your car explode? What did I remove?

the first one is P/N 001 640 7197
the second one I was barely able to read, but after some WD 40 and my wife's toothbrush... (just kidding, I didn't use WD-40) 001 540 70 97

Hmmm........two switchover valves. Hopefully, they both operate the EGR and the ARV in some fashion.............I've not seen a vacuum diagram with that setup.

I don't have to much concern about it, provided that the vacuum to the VCV is intact and the orifices as shown in the schematic are still in place.

How's the transmission?

raslaje · #32 12-05-2007, 11:31 PM

Quote:

Originally Posted by SGT John

Not even counting the one that is used for the boost, I appear to have 2 switchover valves... (well... had) They were both in the same area, both were connected to a wire, and were both connected by separate vac hoses to the main vacuum line... Did I pull out one of the parts that DO make your car explode? What did I remove?

the first one is P/N 001 640 7197
the second one I was barely able to read, but after some WD 40 and my wife's toothbrush... (just kidding, I didn't use WD-40) 001 540 70 97

I have 2 switchover valves also just like this:

Brian Carlton · #33 12-05-2007, 11:33 PM

Are you fellows referring to item 125 as the second switchover valve?

This detail controls the transmission when cold...........and you don't need to remove it from the system.

raslaje · #34 12-06-2007, 01:43 AM

Quote:

Originally Posted by Brian Carlton

Are you fellows referring to item 125 as the second switchover valve?

This detail controls the transmission when cold...........and you don't need to remove it from the system.

Yes 125. I understand. Switchover valve 125 should remain as it goes to the blue flying saucer which is involved with the transmission. Just remove the vacuum line at 63b and plug that port so vacuum is not lost.

Biglex · #35 12-06-2007, 04:00 AM

Dont have any info like this for a 92 300D do you?

SGT John · #36 12-06-2007, 04:05 AM

I do have the blue flying saucer, I guess I overlooked it since it's not bolted in but just "hanging around" I guess I need to study this new diagram.. no hurry though, my primer is gushing fuel and sucking as much air as I do when I run in the morning. The part is in the mail and hopefully I will get it in time for the weekend, along with my shutoff valve

SGT John · #37 12-06-2007, 04:13 AM

raslaje,

could you post the part number off both valves, and also give me the general location of both of yours? All of mine are unmounted thanks to the PO, but the wire connectors of both right above the driver's side wheel well

Brian Carlton · #38 12-06-2007, 08:31 AM

It appears that our documentation is in error.

Do both of you fellows have Federal '85's..........meaning not "California"?

I believe the vacuum amplifier is on all federal '85's...........thereby confirming the second vacuum diagram in post 32 as the proper vacuum diagram.

If so, I need to make some corrections to the titles in the vacuum diagrams.

SGT John · #39 12-06-2007, 08:35 AM

I have a fed 85

Brian Carlton · #40 12-06-2007, 08:42 AM

Quote:

Originally Posted by SGT John

I have a fed 85

Thanks. Then, our vacuum diagram titles are definitely in error.

I'll get it fixed.

In any case, the switchover valve that belongs with the amplifier (blue flying saucer) can remain in the system. It softens the shifts when cold, if you prefer that.

SGT John · #41 12-06-2007, 12:06 PM

Quote:

Originally Posted by Brian Carlton

It softens the shifts when cold, if you prefer that.

Since mine is already out, can I expect any extra wear and tear if i don't put it back in? I already tend to sort of cue my shifts with the accelerator pedal, so I have never experienced any excessively rough shifts.

Brian Carlton · #42 12-06-2007, 12:28 PM

Quote:

Originally Posted by SGT John

Since mine is already out, can I expect any extra wear and tear if i don't put it back in? I already tend to sort of cue my shifts with the accelerator pedal, so I have never experienced any excessively rough shifts.

Actually, the firmer the shift, the greater the longevity of the transmission. The reason for softer shifts is ass related.........not mechanical durablilty related.

SGT John · #43 12-06-2007, 12:30 PM

Then it looks as though more changes to the document I sent you are in order. Can you confirm that the vacuum restricted orifice is the one that causes a softer shift, and can you confirm that this is the only thing the "flying saucer" is used for?

Brian Carlton · #44 12-06-2007, 12:47 PM

Quote:

Originally Posted by SGT John

Then it looks as though more changes to the document I sent you are in order. Can you confirm that the vacuum restricted orifice is the one that causes a softer shift, and can you confirm that this is the only thing the "flying saucer" is used for?

Nope, the document you sent me is perfect. It's the second vacuum switchover valve near the amplifier that causes the softer shifts.........only when cold.

gande96 · #45 12-06-2007, 02:37 PM

Brian - I was looking at your by-pass intructions. Will this affect the door locks or a.c. system? I have a leak somewhere and its making the center a.c. vents not work as well as poor shut-off, slow door locks, hard AT shifting. Any ideas. I am new to this vacuum stuff.