Another not so brilliant question, all. In my '77 240D, there is a clear, plastic tube that comes from the vacuum pump and runs to the top of the air filter. On the air filter end of that tube, there is a connector. Could one of you illustrious gurus please tell me what the bloody thing is called?

I've attached a picture below and added and arrow for clarity. Disclaimer: I've lifted this pic from an old thread on the site. It perfectly shows what I'm trying to point out. If that is not allowed, please delete and accept my apologies.

That would be part of the fresh air intake line supplying the vacuum pump with clean air. As far as i know that is only available as part of the entire line, so you will have to get a new or used inlet line for the vacuum pump

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg

Pipe - From air cleaner to vacuum pump: MB part number 6172300456.

Check with the Mercedes-Benz Classic Center | Mercedes-Benz for availability or buy used.

(Listed as NLA at two MB dealer wholesale part websites)

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78 W116 300SD 'Desert Rose' new as of 01/26/2014
79 W116 300SD 'Stormcloud' RIP 04/11/2022

Any reason why a rubber vacuum Hose could not be used to replace it?

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84 300D, 82 Volvo 244Gl Diesel

Well, It seems a bit sharp, so I'd like to have whatever part I need to join the clear hose to the air filter cover for a good seal.

I think that tube contains air removed by the vacuum pump. If for example the diaphragm fails in your vacuum pump you will see oil come out of it.

Because this fault make an engine appear to be burning oil if it occurs.They changed the termination of it in the later years of this model. .

To me it could end anywhere with no issue I can think of. Just left open should be okay for example. Simply because all it is normally emitting is the air scavenged by the vacuum pump.

As for the part you are asking about it is just a hose barb probably. I have absolutely no ideal of why they just did not vent the vacuum pump to atmosphere anyways.

Some little elf in the black forest wanted to complicate it. Or was it a preventative measure to stop oil being spewed out into the environment if the diaphragm in your vacuum pump leaked? The next generation fed the output into the engine base I though. May not be right about that but the termination was changed is certain.

OK, how about this. Does anyone know the availability of just the grommet?

I got off my rear end, measured the hole and went to Lowe's.

The grommet that fits is 1-1/8 OD x 5/8 ID. This fits perfectly.

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85 300D

The question was not meaning to be sharp. You should of course have what you want.

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84 300D, 82 Volvo 244Gl Diesel

NO NO! I meant the hole in the air filter lid had sharp edges! Diesel911, you can be as sharp as you like! With all the advice you've given me, you've earned it!

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85 300D