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#1
08-13-2012, 11:19 AM
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Broken piece behind Modulator Valve on transmission
Okay - I removed the modulator valve on the transmission of my 87 300D. I notice the piece that the modulator valve goes into was broken. The part is plastic and is shaped like a cup with stem and the stem is broken. My question is can I drive it this way until I find the replacement part? I guess my question is what does this do? Is there pressure pushing on the stem, to where it really doesn't hurt, or does the modulator valve pull up on the stem depending on the vacuum supplied?
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05 SL600 75K 87 MB 560SL 119K 87 MB 300D 180K 83 MB 240D 110K 64 1/2 Mustang 74 Monte Carlo 32K 75 Fiat 124 Spyder 16 Equinox 15 2500HD Silverado 
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#2
08-13-2012, 02:08 PM
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Quote:
So it might pay you to call the Dealer and see if one is in stock and get the Job overwith. The Valve controls the Modulating Pressure.
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84 300D, 82 Volvo 244Gl Diesel
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#4
08-13-2012, 02:33 PM
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You will need to replace the plastic pin, for sure. This pin was broken on mine, when I first got it. (Maybe because a previous "mechanic" had tried to change the modulator for shifting problems, instead of repairing the vacuum leaks.)
Symptoms of very erratic/no shifting on a constant basis.
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Sam 84 300SD 350K+ miles ( Blue Belle )
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#5
08-13-2012, 03:45 PM
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SD Blue - Not sure if we are talking about the same thing. - I can't find any exploded pictures that show the part. When you remove the vacuum modulator, the part is in the transmission and the plastic "cup" is what the modulator goes into, but when I removed the modulator, I happened to look at the bottom of it (the plastic "cup" came out with it) and it looked like it was supposed to have something attached to it. I looked into where it fit and sure enough saw the rest of it in the transmission. I used needlenose pliers and pulled the "stem" out of the transmission and it was about 2 to 2 1/2 inches long. I assume it is supposed to be attached to the cup shaped piece. Does this sound like the pin you are talking about?
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05 SL600 75K 87 MB 560SL 119K 87 MB 300D 180K 83 MB 240D 110K 64 1/2 Mustang 74 Monte Carlo 32K 75 Fiat 124 Spyder 16 Equinox 15 2500HD Silverado
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#6
08-13-2012, 06:28 PM
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I believe this may be what you are talking about:
Mercedes 1262772075 Transmission Modulator Valve Pin | Compare Prices
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Sam 84 300SD 350K+ miles ( Blue Belle )
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#7
08-13-2012, 08:18 PM
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On my year an model the DIYs say it is common for the Modulator Valve to break when you remove the Modulator and if you wanted to finish the job all at one and not have to wait for parts it was suggested to order the Valve a long with the Modulator.
That because the price of the Modulator Valve is kind of minimum.
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84 300D, 82 Volvo 244Gl Diesel
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#8
08-14-2012, 09:49 AM
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SDBlue - yep that's it - how appropriate to call it a modulator valve pin! At least it is cheap. Diesel911 - how true. Now, does it hurt to drive it with this being broken, until I get the new one? I figure if pressure is coming from the bottom it shouldn't hurt.
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05 SL600 75K 87 MB 560SL 119K 87 MB 300D 180K 83 MB 240D 110K 64 1/2 Mustang 74 Monte Carlo 32K 75 Fiat 124 Spyder 16 Equinox 15 2500HD Silverado Last edited by mkrazy1; 08-14-2012 at 10:24 AM.
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