This is a OM 606 and it (gold colorered with black plastic cap) is blocking access to a glow plug. It is on the injection pump.

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95 E300 Diesel 200K

My best uneducated guess (617 experience only - if 606 is non-turbo then this is all BS) is that it's the ALDA. The black cap on the top is there to prevent unauthorized adjustment. There should be a large nut on the bottom of it that is captive on the IP. Turn it clockwise while holding the ALDA stationary (CW, that is correct) to release the ALDA.

On my ALDA, I cut the black cap off with a Dremel tool, then backed the nut off completely holding the center screw with a straight blade screwdriver, removed the remains of the cap, then replaced the nut. Makes a nice clean looking ALDA. If you are rebuilding your engine, then you will probably want to adjust this item anyway, so you might as well take it off and cut it while it's off the IP.

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mjk

'84 300SD 119KMi (Liesl der Diesel)
'84 300D 326KMi when the oil left (former parts car)
'82 300SD 253KMi (new parts car)

It is the non-turbo version of the 606.

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95 E300 Diesel 200K

It's probably an altitude compensator, regulates how much fuel the IP squirts into the engine as a function of altitude above sea level.

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"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

Far as I know has a big 27mm retaining nut below that you have to crack with a wrench then remove with your fingers. If so then there is a loose shim below, don't lose it. Cheers Dan

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It's always something simple
91 300D 603.960 (from japan) 194K
92 Toyota Diesel Landcruiser HDJ81-t 116K
02 Golf TDI new head courtesy of PO
87 300D
97 BMW 525 TDS Wagon 5spd
bunch of Onan and other diesel generators

I don't have this thing on my '97. Maybe it's a '95-only thing?

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'98 E300 turbodiesel

Might also be a Federal/California difference.

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1981 Mercedes 300TD, 1994 Honda Civic Del Sol
http://mefi.us/images/fuelly/smallsig-us/67195.pnghttp://mefi.us/images/fuelly/smallsig-us/103885.png

my car is not california emmissions and it does have this part - quite, its an altitude compensator. Dont know how to get it off though.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

OP said it was non-turbo, and I was under the impression that the ALDA was turbo only. Is that not true? Or is it only true for certain chassis/year/model/etc.?

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mjk

'84 300SD 119KMi (Liesl der Diesel)
'84 300D 326KMi when the oil left (former parts car)
'82 300SD 253KMi (new parts car)

It’s on the way, but you should still be able to remove the glow plug without too much of a hassle…

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1995 E300 Diesel
2002 GMC Duramax CC LB 4X4

I took the crossover pipe off my car to get access to the shutoff valve and the ADA is in the way of removing the valve. There was no way that I could figure to fit the wrenches in the space available and ended up abandoning the project. Is there a trick to getting the ADA out or do I just need to remove the entire intake to get room?

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'82 300D - Light Ivory, 2nd Owner (Back in the wind April 2013!)

'95 E300D - White, grey interior. (Suffering from stuck/broken glow plugs)

Deuteronomy 22:4-
"Thou shalt not see thy brother's ass or his ox fall down by the way, and hide thyself from them: thou shalt surely help him to lift them up again."

I expect the attachment isn't too different from the ALDA on the 603 - http://www.peachparts.com/Wikka/OM603Alda . Big nut on the IP, wrench flats on the ADA.

Sixto
87 300D