Diesel Engine Specific Aid

1979 300TD transmission vacuum controls???

Hi all,

I've got a 1979 300TD non-turbo that isn't shifting correctly. I'd like to start out with the vaccum system, but can't seem to come up with a schematic.

I've got Kent's transmission tuning manual, but the transmission in the 1979 wagon looks to be different than any of those explicitly described in the manual, and the vacuum schematics in the appendix don't seem to match either.

I've got two questions:

What is (and how do I test) the item labeled "B" in this picture? (I assume it's the VCV)

Chassis Model Number

W123

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Diesel Engine Specific Aid

86 300D run-away engine

I have a 1986 124 300sd. I was changing out the glow plugs with the glow plug reamer kit available at MercedesSource, Awesome kit everything was a breeze lots of carbon build up. The problem arose on the test drive when the car accelerated uncontrollably! Upon close inspection I noticed that two hard fuel lines had been replaced, (by the previous owner) and in working the throttle linkage noted that ever so often the linkage rubbed on the fuel lines causing the throttle to stick in the open position.

Chassis Model Number

W124

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Diesel Engine Specific Aid

1981 300TD-T Lack of Power

This 300TD-T has been running on Veg for about 3 years and 12k miles, I have owned it about 5 months. The rebuilt engine has 50k miles in it. Starting two weeks ago, the wife noticed a subtle power loss on hills and more white smoke than usual (this car has burned very clean except at start up). I drove the car last week, and tested it on a few residential hills in the neighborhood. At idle, the engine revs well…on the flats power is OK, but definitely not as strong as a few weeks ago… going up steep hills is impossible.

Chassis Model Number

W123

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Diesel Engine Specific Aid

1981 300TD-T "Switch Over Valve" disconnected

In doing some routine maintenance on our recently acquired 300TD-T I came across what has been called the "switch over valve" attached to the fire wall, next to brake booster. Both the vacuum line from the turbo and the alda have been disconnected and a short piece of hose connects the two.... a bypass. I understand that this can damage the engine. Is there any test to see if this valve still works before I reassemble the correct way?

Thanks is advance.

Steve

Chassis Model Number

W123

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Diesel Engine Specific Aid

85 300TD fuel sending unit wont fit

I have now tried to install two sending units with matching numbers in my 85 wagon, but they have both been about 1/4 inch too long. Was there more than one tank, one that was not as shallow as the other, available? It appeared as if one of the previous owners bent the tube on the old one to fit, so it would not hit the bottom of the tank. Can the sending unit be modified slightly to fit?

Chassis Model Number

W123

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Diesel Engine Specific Aid

1985 190D 2.2: where is the fuel prefilter?

I'm perhaps exposing my ignorance, but where is the fuel prefilter on my engine? The picture included with the filter kit doesn't help me, as I can't locate just where that refers to. I suppose it's possible that the prefilter was removed at some time.
Since I plan to replace the gunked-up filter in the tank, I'd like to have a good prefilter in place to catch whatever I stir up in the process.
- Richard

Chassis Model Number

W201

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Diesel Engine Specific Aid

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