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Old 08-04-2006, 06:58 PM
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Join Date: Jul 2006
Location: far n.w. wisconsin
Posts: 180
Vacuum modulator rubber cap

where does a fella find one of these ? mine is cracked and glued but i need to adjust the modulator and im sure the cap will come off in two peices this time. i checked the parts breakdown somewhere on this forum and its not listed. we have no dealer within150 or so miles so purchasing one is kinda a problem. thanks in advance.
1983 300d turbo

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Old 08-04-2006, 07:03 PM
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Join Date: Dec 2002
Location: Ca.
Posts: 971
I hear that FASTLANE carries them here on this site. They're cheap.. order a spare or two.
My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.
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Old 08-04-2006, 11:24 PM
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Join Date: Jun 2005
Location: Lincoln Univ. PA
Posts: 48
I have one

Hi Davidh

I have one off of a modulator that I replaced. It's not from an `83, but I bet it's the same. The cap seems to be in decent shape and it's free. Send me a private message through this site with your address and I'll get it in the mail. I'll send the key too, just in case.

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Old 08-04-2006, 11:57 PM
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Join Date: Jun 2004
Location: West of Ft. Worth. TX
Posts: 4,164
This happened not too long ago. For some reason, it is listed for the w126's but not the w123's. Try this:

84 300SD 350K+ miles ( Blue Belle )
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Old 08-05-2006, 01:35 AM
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Join Date: Aug 2005
Location: Palmdale/Ventura, CA
Posts: 813
Also dealer item. $2 or so.
Fastlane has it too.

And.... they do need to be vacuum tight.

I actually made my own.

Model car tire and a dime as a cap, then some black RTV.
80 300D 340K Owned 30 yrs
83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day
02 Z71 Suburban 117,000
15 Toyota Prius 2600 miles
00 Harley Sportster 24k
09 Yamaha R6
03 Ninja 250
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Old 08-05-2006, 10:55 AM
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Join Date: Jul 2006
Location: far n.w. wisconsin
Posts: 180
modulator cap

thanks for the help. i knew someone would come up with a creative fix too. im going to attempt to halt the HARD shift on a low mileage car this wekend and mine has a repaired crack already.

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