W115 With M121 and Stromberg Carburetor - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 04-13-2015, 10:38 PM Thread Starter
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Vehicle: 1959 190, 1961 190SL, 1967 250SE 4Spd, 1968 220D 4spd
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W115 With M121 and Stromberg Carburetor

A guy I know has a 115 with an M121 (220) and the Stromberg carburetor. I've seen thousands of Mercs over the years, never come across one of these, and after some research, i'm beginning to understand why. Most retired Benz guys sigh after hearing about this oil-bathed stromberg, and the usual response is something like "tell him to look for another car"

Are there any alternatives to the Stromberg? The M121 is such a great engine, and the late 50s single solex was wonderful. In my opinion the thermostatic idle/mixture BS they started putting on carb'd benzes really put a dent in their longevity and reliability.

The issue with the car in question is that it will not accelerate. It will start, barely, and only with foot fully on the throttle. It feels like the accelerator pump on the carb (if it even has one?) has a torn diaphragm. The car has decent fuel pressure (using both the original mechanical, and an electric one I put in for diagnostic), proper spark, and good airflow (bypassed air filter housing entirely. I'd like to learn more about this stromberg if any posters have experience with it.
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post #2 of 4 (permalink) Old 04-14-2015, 08:37 AM
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the early cars [ late 60s to early 70s ] had the uncomplicated version of that carb , there was no real bad issues about those , the later version had problems . remove the air filter boot , and with your finger , see if the piston moves freely up and down .if it does , remove the top housing [ 3 screws ] and see if the thin diaphragm is bad [ common ] .report here .
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post #3 of 4 (permalink) Old 04-16-2015, 10:35 AM
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I have a W115 with an M115 engine, is a 200. It comes with a Stromberg 175CD carb and I think they are not much difficult to repair. Actually I think that Aisan carbs are more complicated than this one.

The car belonged to my uncle but he never took good care of it, then it started having problems and shutting off. After like 3 years sitting there, he gave it to me cuz he wasnt gonna do anything at all with the car. So I openned up the carb and found that the diaphragm was torn. I think that is the only real problem on these carbs, but its really easy to assemble and disassemble so no worries...

I haven't finished with it cuz I'm broke and I'm rebuilding the entire engine too. I guess I'll post a thread to tell my story lol...
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post #4 of 4 (permalink) Old 04-16-2015, 11:52 AM
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A real easy carb to fix and a pretty simple car as well but the parts can be expensive. Those diaphragms either got torn or just weaker and the performance would suffer to just stop. A small bit of tranny oil in the reservoir at service would help them last a lot longer.
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