Does anyone out there have any knowledge of the degree to which monovalve cores are interchangeable from model to model? Do some monovalves which are clearly different externally nonetheless use the same core element? Perhaps most importantly, if by physical inspection two cores look identical, is it safe to assume that they are interchangeable?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

all the ones I have pulled look the same.

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08 R320 CDI current

Past
95 E420
87 300D Turbo 5spd
90 300TE
83 300SD
85 300TD
92 400E
85 190D

Are there cases where the externals have looked different?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

what are you asking? what models are you wanting to know if they will swap between?

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Someone has provided me with a monovalve core that, according to him, will work with a 124 (the car in question is a 1991 300D). If all monovalve cores are the same, then I'm sure the part will fit.

For example, a 126 monovalve and a 124 monovalve look very different. But do they use the same core?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

I just went out dug out a 124 monovalve I have and removed the four screws that secure the solenoid coil/plunger assembly to the valve's plastic body. The 124/201 design is completely different and the parts that make up the 123/126 replaceable repair kit - the plunger/diaphragm assembly is completely different and will not fit the 124 monovalve assembly.

Found this pic online:

http://www.***********************/details/QQMercedes_BenzQQ380SEQQBoschQQMono_Valve_Repair_KitQQ19841985QQW0133-1618202.html?apwcid=P1135867996W43b3f85c7ab9e&gan=1&apwidvOSyg6P

This is what I have. So the 124 plunger/diaphragm assembly looks completely different?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

The 124 monovalve internal parts are completely different!

Thanks for taking the time to look into this. It's a shame there's no way (apparently) to buy a kit for the 124.

__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

What year? Perhaps I am mistaken, but I'm sure I have pulled monovalves from w124's that are the same as the w123/w126 etc in the past. Shertex- if indeed it does not fit your model/year then you have a free part- please "pay it forward "onto some other MB owner!

Unfortunately, I don't think I'll be opening up the monovalve any time soon (I don't have an immediate need to replace the core), so I'll need to rely on information from others.

Billybob, are you able to describe how the 124 core looks, and how it differs from, say, a 123 or 126 core?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

I may be at my shop today, if I get by there, I'll pull from one of my parts cars. I have a 300E and a 300D parts cars 90 and 93.
sorry you got a part that won't fit.

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Here are a couple pics, the design is completely different, there is no rubber diaphragm first and foremost, the plunger is exposed rather than enclosed ala`123/126, this valve is from an 87 300D but all 124 are basically the same as are 201 valves after that date. Some of the later 124 valves have a different plastic lower valve body which has double plastic hose bibs, and some are true dual valves with dual valve bodies with dual solenoid operators, but the solenoid operator parts (the coils, the plungers, the conical valves) of the valve are the same.

It makes sense that these later mono valves have fewer problems when you consider the nature of their design compared to the earlier type, there is really no critical part to fail in the newer design. The conical valve seats into an elastomeric seat thereby controlling the heated coolant flow. There is a rubber shaft seal and an O-ring that seals the coil body to the valve body but these are non-critical to the valve operation.

As I’d mentioned earlier one might cannibalize parts from another similarly designed valve, but parts from earlier generation designs are incompatible.

i can say for sure the electrical component of the 123 and 126 monovalves is the same. the body is different (and the 126 is a pain to remove, too)

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as often as I misread a thread, it's off for me to say this, but the thread here is talking about the differences between 123/126(which are the same) and the 124 which as pictured above your reply is very different.

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!