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ALDA: How can you tell if it's good for sure???
Hello All:
I just scoured the scrap yards and came up with a spare ALDA from a mid 80's 300SD, with the adjustment screw. I want to replace mt ALDA so as to have the unmolested original tamper proof and all. As far as I can tell my stock ALDA is fine, just wanted to mess with the enrichment now with the intercooler installed. So I check my original on the car with the vac/pressure pump and get up to 12 psi, holds it. Should be OK, this is my reference. At the scrap yard found same one, tested the same way holds 12psi no issue on the engine. Take it off and compare again. Now the piston travel in the older unit from the 617 is noticeibly more about 4mm total travel, on my 603 the travel of the piston is only half a mm or so, just enough for it to pop, but no apreciable movement in the piston body. I can't get the piston to move further even using needlenose. The scrap unit's piston moves freely when pressure or vacumme is applied, the stock one just slightly, both hold pressure fine on or off the engine, Which set-up is correct?? I no longer have a reference Thanks
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Stable Mates: 1987 300TD 310K mi (Hans) 2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee) |
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I've never done the test as you have described, but it does not seem proper that the 603 could function properly with .020" of travel from the ALDA. This number appears to be way too low to enable proper fuel modulation.
I'll see if I can get Dave to respond to this thread. He's had them apart many times. |
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Thanks Brian
Quote:
I also agree Dave would know these things inside out and no one has mentioned the piston travel in any of the threads I researched. On another note, as to the main IP plunger that the ALDA activates, what kind of resistance should I expect. It now depresses fully but it seems like there is stiff spring resistance aprox 15 lbs. or so to depress. Is this normal? I'm giddy because she currenty runs like a champ 9.8 0-60 times...apparently without the ALDA functioning??? Wonder what she's gonna do with it working right
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Stable Mates: 1987 300TD 310K mi (Hans) 2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee) |
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Wow what a difference!!
Well I installed the ALDA that provided the most piston travel and well what a difference the off idle knocks you back in the seat I luv it Seems to hit boost a bit quicker now too, will keep testing and report back before and after 0-60 and 1/4 times.
Dave please let me know your thoughts on my earlier post. Thanks
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Stable Mates: 1987 300TD 310K mi (Hans) 2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee) |
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617 and 603 ALDA Interchangeable?
Are the ALDA's interchangeable between the 617 and 603 engines? If so, my 602 might benefit from a 617 ALDA as well.
SteveM.
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'93 190E/D 2.5 Turbodiesel 5-speed (daily driver) '87 190D 2.5 Turbo rustbucket - parts car '84 Dodge Rampage diesel - Land Speed Record Holder '13 Ram 2500 Diesel '05 Toyota 4Runner |
#6
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Look in
Look in
post Diesel Injection: ShopForum > Technical Information and Support > Diesel Discussion Organized MB DIY links post: Diesel Injection: Organized MB DIY links ALDA R&R disassembly, cleaning.
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ |
#7
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Quote:
Steve, the ALDA from the late 617 turboD cars are interchangeable with the 603 partnumbers are the same 1 427 133 150. Best of luck
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Stable Mates: 1987 300TD 310K mi (Hans) 2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee) |
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Hi guys, sorry for coming to the party late!
I never measured ALDA movement, but I'd estimate that 4-5mm is about normal. Less than 1mm is NOT normal. Remember that the spring-loaded IP shaft moves upward for more fuel, and down for less fuel. The ALDA capsules hold it down (less fuel), and when pressure is applied to the ALDA, the internal capsules collapse under the pressure, allowing the shaft to move upward due to the spring pressure. If you remove the ALDA, you'll get full enrichment all the time. This would likely provide poor (and smoky) low-RPM performance, due to the over-rich condition. But there would be no additional high-RPM power, since the full load fuel is still limited by the internal rack stop. Casey (Zeitgeist) was kind of the pioneer in this field in the USA on a 603 motor. His basic settings, from memory, are 1.5 turns CCW on the full load screw, and approx 0.75 turns (CCW, I think) on the rack minimum position screw (kind of an internal 'coarse' idle speed adjustment), then tweak the ALDA as needed to get it as lean as possible without power loss. More than 1.5-1.75 turns on the full-load screw results in the engine not wanting to return to idle, or not idling at all (engine RPM's way too high). That's when you need to send the pump to Myna Diesel in Finland, to get larger elements installed, so the pump can properly meter fuel and keep normal idle behavior. Uh - this all assumes you have an intercooler installed, and an EGT gauge to watch. Doing this on a stock setup will likely melt pistons after 30-60 seconds of hard throttle! |
#9
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Thanks Dave, but where is the IP full load screw
Quote:
Bill
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Stable Mates: 1987 300TD 310K mi (Hans) 2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee) |
#10
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Quote:
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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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Thanks....
Quote:
Thanks Bill
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Stable Mates: 1987 300TD 310K mi (Hans) 2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee) |
#12
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I replied to your email with the info... I also attached the PDF file below.
My website domain changed, the new link to the documents is: http://www.w124performance.com/docs/ |
#13
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I was just looking at a Tech Service Bulletin Modified Aneroid Compensator (ALDA) Engines 617, 601, 602, 603 No. MBNA 07.1/19 (march 1993)
Stating that as of 1993 a new style aneroid compensator (ALDA) was phased into production and are fully interchangeable with eariler models. Showing Model(s) 80-85 300 D, CD, TD SD 84-89 190 D 86-87 300 SDL 87 300 D, SD 90-91 350 SD, SDL 90-93 300 D 92-93 300 SD (note)pre 85 with banjo style fittings will requier some mods. Hope this helps on their interchangeability. |
#14
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Alda
Where do you get a new ALDA for a 1982 SD
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#15
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You'll need to resort to e-bay or the junkyards as it's not sold as a separate item from the IP. Why do you believe you need a new one?
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