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EGR elimination, 617 engine
While in the final stages of getting the SD ready to run, I cleaned up the underhood environment and eliminated all the vacuum lines to the valve cover.
The attached photo shows all the remaining connections. The main vacuum supply goes to a single T as seen in the photo. One end of the T goes to the vacuum control valve (via the green dampener) and the remaining end goes off to the transmission. Note the restriction orifice remains in the line to the vacuum control valve. One T is completely eliminated........the line to the black box on top of the valve cover is eliminated. The vent line goes directly to the vacuum control valve. One T is completely eliminated. The return vent line to the black box on top of the valve cover is eliminated. Not shown in the photo is the line from the black box to the temperature switch on the thermostat housing. Remove it and toss it. Finally, the line from the temperature switch to the EGR valve is eliminated. As a final farewell, I opened up the black box and pulled out the remains of the 3-2 switches. The IP linkage works a bit smoother when you don't need to force the cam. Much cleaner underhood environment. |
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Quote:
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DJ 84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012 |
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I put a 1979 300SD W116 intake and exhaust on my W123 today....no EGR on this baby.....and no black goo either....though I do have to say I found far less goo than many have described...only about 1/8 inch....maybe a tad more in places..I didn't have the time..nor the motivation to clean it out and put it back on today...
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Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche |
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Glad to hear you have deep 6 the EGR.
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1981 300D 147k 1998 VW Jetta Tdi 320k 2001 Dodge Ram 2500 141k 1979 300D 234k (sold) 1984 300D "Astor" 262k(sold) Mercedes How-To and Repair Pictorials I love the smell of diesel smoke in my hair |
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and Brian will like the clean unencumbered manifolds every time he opens the hood.
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Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche |
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how much persuasion did it take to get the plug out of the block? I still have mine to do...eventually
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1980 500SE/AMG Euro 1981 500SEL Euro 1982 380SEL 1983 300TD 1983 500SEC/AMG Euro 1984 500SEC 1984 300TD Euro 1986 190E 2.3-16 1986 190E 2.3 1987 300D 1997 C36 AMG 2003 C320T 4matic past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350 |
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Quote:
__________________
Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche |
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I'm looking forward to finally starting it up.............it's been five months. |
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Nice clean setup...considering doing the same but the vac leaks (presumably from the valves on the valve cover) actually are just enough to appropriatly firm up the shifts with the addded HP.
No flaring or anything...but I like shifts a tad on the firm side...Still testing with no leaks and its okay... BTW when I took out the plug in the 300SD to put in the block heater it took oxy-acetylene, allen wrench + 4 foot cheater + 300lb 6'4" dad to break it loose. And there was NO rust what-so-ever on the engine/plug/car. Simply tight. Be forwarned people of the forum... |
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It will be interesting to see if the elimination of the 3-2 valves on the valve cover will firm up the shifts. The restrictor is only on the transmission circuit so there should be more than sufficient vacuum in front of the restrictor to maintain normal vacuum levels downstream to the vacuum control valve. |
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For example...disconnecting the line to the tranny altogether makes it shift hard. |
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But, we'll see.............after it runs. |
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Good thread, Brian. I'm currently doing the same project on my w123. Question, do you know if the vacuum control valve adjusts for how much fuel pedal is applied? How so?
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1989 300E 144K |
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The linkage is connected in the back of it.
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#15
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Exactly. As the rack is opened, the linkage serves to move the valve and cause more vacuum bleed so the transmission sees less vacuum. This is why the restrictor is critical. The cabability of the VCV to bleed is limited and it needs a restriced supply to function properly. |
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