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  #1  
Old 06-28-2001, 01:37 AM
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Here is a question for the experts. Where is the full load fuel adjustment on a '82 300SD? I have done the ALDA adjustment and it is maxed out. As I understand it is more of a pollution control device than a load adjustment. Any fuel pump I have had anything to do with has a full load fuel adjustment. My guess is that it is behind the cover on the back of the IP. Can anyone fill me in on the details.
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Old 06-29-2001, 01:04 AM
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Steve; won't you tackle this one

Just bringing this back up. Won't anyone give a response.
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Old 06-29-2001, 02:52 AM
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Iíll throw in my unwarranted & relatively ignorant 2c worth in here. Please bear in mind that Iím on the steep end of the learning curve regarding diesels Ė Iíve owned mine for less than a month.

From my understanding, the ALDA functions as an altitude compensation device. Technically, it would be referencing the deflection of the sealed chambers/bellows inside of the ALDA to determine actual atmospheric density. Knowing this, and after studying the images of the (internal) linkages on the service CD, it would seem logical that the ALDA will affect mixture throughout the RPM range. On a non turbo engine, it would be strictly for altitude & weather compensation. On the turbos it detects manifold pressure as an increase in atmospheric density, and enriches the mixture appropriately.

Once again, caveat emptorÖ Sometimes free advice is only worth what you pay for it. At least if the advice comes from me! There are others on these forums that really, REALLY *REALLY* know their stuffÖ (Iím trying not to name names, but they know who they are)

P.S. When you say that you ďmaxed outĒ your ALDA setting, how many turns did you move the screw? And what is the result of this? Are you now hiring out as a mosquito abatement contractor? Just kidding, but let us know.
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Old 06-29-2001, 10:28 AM
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RunningTooHot

You are correct about the ALDA but an IP must have a fuel adjustment for full load fuel setting. The ALDA maim purpose is to control the smoke to an acceptable amout at all altitudes.
As for what I did, the adjustment screw was backed all the way out when I bought the car.Very little smoke. I put washers under the ALDA and still no more smoke but I got more power. When I say maxed out I mean there is not more room for washers under the aneroid. No I am just curious as to where the fuel screw is.
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82 300SD 110k
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92 Jetta TD
97 Cadillac Concours(300hp)
84 Celebrity 4.3L diesel
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Old 06-29-2001, 11:30 AM
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I am cognizant of the fact that there must be a full load adjustment, in addition to other adjustments that are utilized when the pump is calibrated on a test bench. Perhaps I am a little too chicken to play with such settings without the proper methodology for testing; I donít know whether or not playing with the mixture settings while the IP is on the car is advisable.

While more fuel = more power, it is only true up to a certain point. Once you run out of enough oxygen to support combustion, you would be dumping fuel and $ out of the tailpipe. From what Iíve read here, there is also a combustion temperature factor that must be addressed; this I donít quite understand, as on a gas engine, excessive fuel cools down the combustion process. Additionally, on a diesel, Iím not sure about the effect that excessive fuel would have on washing down the cylinder walls. On a gasoline engine, that is definitely a no-no, and I see no reason that it would not apply here as well.

What I would like to do is dump a ton of fuel on demand, i.e., set up a switch that I could manually activate when I wanted to create a cloud of noxious fumes. Donít ask me why.

With the aneroid set for full rich, and youíre still not getting ANY smoke out the tailpipe, perhaps there is something else amiss?

Good Luck!
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