Afternoon,

The round thing with the screw in the middle that looks like you can adjust with a screw driver. If I can get this off I'll be able to pull out my IP. I used a 17/8 (close as I could get) and turned the nut below the round top in the direction you would normally turn to take off, but it got tighter, and it seems like in the other direction too. Of course I only have a little bit of distance to turn each time. Does that screw in the middle have anything to do with taking it off. What is it anyway? Thanks for your help.

Hugh Sr

1984 190d (W201/601)

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Probably someone will come along that knows more about it than me, BUT:
I think it is a rack dampener, it keeps the rack inside the pump steady, sort of like a shock absorber.
I am not sure, but I think if you look between the round part and the pump, you may see fasteners in between there (a couple nuts?) that hold it to the pump. I believe I have changed these dampers before w/o removing the pump, may have been a different engine though.
I also believe you can take the pump off w/o removing that, is it possible to remove whatever is keeping the pump from going back?
Do you have the vac pump off and the sprocket removed?
Do you have a way to time the pump after you've reinstalled it?
Why are you taking that danged thing off anyways?
Gilly (inquisitive today)

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edit: I see you have a 201 chassis, more than likely I was working on a 126, so there may have been more room.
If that thing isn't working right, the engine idle will fluctuate quite badly, really hunting around. It IS adjustable by that screw you are screwing around with. I don't know what the result is if you have it set too tight, but I do have a theory about that......
Gilly

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I'm not familiar with that engine, but one of the items in the pic appears to be the ALDA.
If so, you may get more responses asking about that.

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83 SD

84 CD

It's the ADA, nonturbo version of ALDA. I believe the part you are rotating should go clockwise, that big nut on the bottom does not come off, instead the ADA screws out of it. The ADA itself should turn counterclockwise to come off. If you look at it sideways you'll see that the ADA has a thin area on the bottom for a second wrench. The top screw does not do what you want.

In fact it will probably it will do bad things. It shouldn't be screwed with (pun intended).

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An 84 has a ADA?
I thought that was old school.
All my MB's had/have [82-85] an ALDA.

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83 SD

84 CD

It's a nonturbo 190. All your MBs are turbo.

Non turbo 123's have an ALDA, which, I understand is an automatic ADA, it's not hooked up to the intake, just open to the atmosphere under hood.

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83 SD

84 CD

Maybe I got the name wrong...

You (both?) are right, na has an ADA and turbo has an ALDA. ADA is for atmospheric pressure where the ALDA is boost and atmospheric.

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1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

I think we all refer to the part as the ALDA whether it is turbo or non-turbo. Maybe it's not technically correct, but most members won't know what an ADA is, but certainly know what the ALDA is.

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Michael LaFleur

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
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its something that relates to altitude and fuel/air mixture. I used a big ass pipe wrench to remove mine when I worked on the glow plugs. I saw some posts here about it, but don't remember anyone ever coming up with anything solid. I guess its like the Jersey Devil and Sasquatch.

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The nut below it should loosen with a quarter turn or less to finger tight. It has 27mm across the flats and is captive to the top of the pump much like a garden hose connection. It has the same function as the ALDA on the turbo models , you can get a bit of a snappier response in the mid range. A couple of turns on the setscrew is about the max though any more and the car may be hard to start. There are actually shims under this the same as with the ALDA so MBZ tried to get it pretty close without touching the setscrew. Cheers Dan

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