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#1
11-12-2006, 05:36 PM
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Modulator Valve?
Does the rubber cover over the modulator adjustment hold the vacuum? When mine is off it does not hold vacuum. Now it's all dried out and split. Tried another off the kids wreck but it does not hold 100% either. Are there new ones available?
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1984 280SEL, 62,000 miles Euro model in the USA 1983 300D (Totaled out 10/2004)  New Factory Mint Green paint Palomino int 1982 240D (Steak dinner for two) 
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#2
11-12-2006, 06:15 PM
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You will find a new one at the dealer and it should then hold vacuum. If it does not then the modulator is at fault if the line to the modulator is not faulty.
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-disav 99 E300 TURBODIESEL Astral Silver 282K - AMG brakes, suspension, monoblocks, speedo & interior - Full Load Maxed on IP by custom Speed Tuning USA Chip - T3/T4 Garrett - EGR/MAF delete 98 E300 TURBODIESEL Alexandrite Green on black leather 289K 95 E300 DIESEL Green Queen 267K SOLD 84 300D 216k SOLD 87 300D 299K #22 head - intercooler - full load adj. - 8sec 0-60mph - SOLD 76 300D 214K SOLD
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#3
11-12-2006, 07:10 PM
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So the rubber cap must seal for sure? Sure seams like a place for a regular failure.
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1984 280SEL, 62,000 miles Euro model in the USA 1983 300D (Totaled out 10/2004) New Factory Mint Green paint Palomino int 1982 240D (Steak dinner for two)
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#4
11-12-2006, 09:18 PM
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OSH again
Ok not original Benz but the 1/2" rubber nut cap from OSH for 29 cents seals tight. I bought four cause I figure one or two will rollaway into oblivion when I'm making adjustments to the modulator
 Next question while I'm here. Clockwise in for firmer shifts or the other way around? I need to go softer shifts. I don't think I should be loosing traction in the rain on the 1, 2 shift. I'd hate to be cited for exhibition of speed 
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1984 280SEL, 62,000 miles Euro model in the USA 1983 300D (Totaled out 10/2004) New Factory Mint Green paint Palomino int 1982 240D (Steak dinner for two)
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#5
11-12-2006, 09:43 PM
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Quote:
Here's one place I found them... havent asked dealer yet... http://www.***************/search/product.aspx?sid=m1ukl455v14bhu45djxlyc24&makeid=800016@Mercedes&modelid=1193789@300DT&year=1984&cid=@vacuum&gid=7776@Modulator
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the sooner you start... the sooner you'll get done  If it ain't broke, don't fix it.. Its always simpler to tell the truth... 2007 Honda Accord EX 2007 Honda Accord SE V6 96 C220 97 Explorer - Found Another Home 2000 Honda Accord V6 - Found Another Home 85 300D - Found Another Home 84 300D - Found Another Home 80 300TD - Found Another Home Previous cars: 96 Caravan 87 Camry 84 Cressida 82 Vanagon 80 Fiesta 78 Nova Ford Cortina Opel Kadet 68 Kombi Contessa
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#6
11-13-2006, 11:14 AM
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They are also listed in Fastlane here:http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1XZ0NWULG1XZ0NX7KV&year=1984&make=MB&model=300-SD-002&category=J&part=AT+Modulator+Cap
(For some reason, I have found this part under 126 models but have noticed that it is not under 123 models. I believe it is just a data entry glitch.)
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Sam 84 300SD 350K+ miles ( Blue Belle )
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#7
11-13-2006, 11:36 AM
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Yes, the modulator cap is enough to seal it off. Mine was the same way, I replaced the cap and it held vacuum for longer than I desired to wait.
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Jeff M. Mercedes W123 DIY pages are now located here. 1983 / 1984 300D Sold 2000 CLK430 Cabriolet ~58k Sold 2005 Avalanche 4x4 ~66k
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Linear Mode
