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  #1  
Old 08-27-2005, 06:43 AM
Dieselcraze
 
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Exclamation Help with Alda

I have surched the threads, and nothing on the removal and installation of the Alda. Is the Alda hocked to the push rod in the pump. (82 300D Turbo) Please Help!

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  #2  
Old 08-27-2005, 07:00 AM
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I'm pretty sure it is not hocked anywhere - jk.

Anyway, there is a large nut underneath the ALDA (I'm thinking around 27 mm - not exactly sure though. Nut turns clockwise as you are looking down on it to allow you to remove the ALDA.
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  #3  
Old 08-27-2005, 07:30 AM
Dieselcraze
 
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o.k. thanks, is there anything I need to know before I take the old Alda off, and put the new one on? On a open end wrench do you know what the mm size is for a 1 1/16 in.?
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  #4  
Old 08-27-2005, 08:11 AM
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Quote:
Originally Posted by Dieselcraze
o.k. thanks, is there anything I need to know before I take the old Alda off, and put the new one on? On a open end wrench do you know what the mm size is for a 1 1/16 in.?
That would be a 27mm . . .

I haven't removed the Alda so I have no experience to share on that . . .
Steve
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  #5  
Old 08-27-2005, 10:02 AM
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Can you explain why you are removing the ALDA? These devices are very reliable and rarely require replacement.
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  #6  
Old 08-28-2005, 09:21 AM
Dieselcraze
 
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The screw broke, the threads striped. So I went to the junk yard and pulled what looks like a good one (untouched).
I opened it up, cleaned it up, and resealed the unit. I just got done installing it in the car. It works great. Thanks for the tips.
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  #7  
Old 08-28-2005, 06:35 PM
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what is the ALDA and does the 240 have one?
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  #8  
Old 08-28-2005, 09:54 PM
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Quote:
Originally Posted by kirk240
what is the ALDA and does the 240 have one?
The ALDA is a device that senses manifold pressure and advances the rack to provide more fuel to the engine. If it doesn't work, the turbo is effectively useless, because you have additional air for the engine without any additional fuel.

The 240 has no ALDA because it's not turbocharged.
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  #9  
Old 08-28-2005, 10:12 PM
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How can you tell if the alda is providing the factory set enrichment that it had
with a given factory pressure feed from the turbo.
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  #10  
Old 08-28-2005, 10:29 PM
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Quote:
Originally Posted by lakerat
How can you tell if the alda is providing the factory set enrichment that it had
with a given factory pressure feed from the turbo.
That's the question of the day.

In short, you can't.

As the systems age, the theory is that the ALDA does not provide the fuel as specified by the factory setpoint and the engine is running leaner than it needs to be at most operating points. This results in a "sluggish" feeling off idle until the turbo builds some boost.

The solution is to adjust the ALDA to provide more fuel until you start to get some black smoke under certain operating condition. Then, it's set too rich.

It's a bit of an iterative process. There is effectively no way to determine the proper setpoint of the ALDA without driving the vehicle and looking for smoke.
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  #11  
Old 08-29-2005, 12:20 PM
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If I was to add a shim on the alda would this increase the enrichment that the pressure from the turbo is providing or does it just have an effect on the take off from idle state (turbo lag). I would like to increase the enrichment that the turbo pressure is providing approx. 13 lbs at 3800rpm on my 84 300d.
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Old 08-29-2005, 12:35 PM
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Quote:
Originally Posted by lakerat
If I was to add a shim on the alda would this increase the enrichment that the pressure from the turbo is providing or does it just have an effect on the take off from idle state (turbo lag). I would like to increase the enrichment that the turbo pressure is providing approx. 13 lbs at 3800rpm on my 84 300d.
The ALDA can only increase the fuel enrichment. It does it across all operating ranges.

You seem confused on fuel enrichment and turbo boost. The ALDA can't increase the boost from the turbo. A wastegate adjustment is required for that.
The ALDA can simply add fuel when it sees boost pressure from the manifold.
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  #13  
Old 08-29-2005, 02:04 PM
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My turbo is at 13 psi at 3800 rpm is there no way of adjusting the max. fuel that is added by the alda at that given pressure does the shim not do that. Thanks for the help, trying to understand the alda better, I have the boost pressure but I am not sure there is enough fuel enrichment at that boost pressure to give me the power I had when the car only had 71,000 miles on it.
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  #14  
Old 08-29-2005, 02:15 PM
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Dieselcraze,

The nut screws into the ALDA. Nothing special about it. Screw it off screw new one back on. Adjust as necessary.

You can hold back on alda. Use whatever wrench size fits.

Spray screw with penetrating oil before making adjustment.

danny
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  #15  
Old 08-29-2005, 02:29 PM
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Quote:
Originally Posted by lakerat
My turbo is at 13 psi at 3800 rpm is there no way of adjusting the max. fuel that is added by the alda at that given pressure does the shim not do that. Thanks for the help, trying to understand the alda better, I have the boost pressure but I am not sure there is enough fuel enrichment at that boost pressure to give me the power I had when the car only had 71,000 miles on it.
Well, the turbo is putting out a perfect amount of boost. So, you only need to adjust the ALDA for more fuel. The shim does that. Also, the screw in the top can also do the same thing, if you turn it counter-clockwise. Only go 1/2 turn at a time and drive it. Look for a performance increase at part throttle and look for smoke. If necessary, adjust it another 1/2 turn. You need to do it in increments and carefully montitor the driveability.

Your're probably right. The vehicle needs more fuel enrichment at part load conditions.

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