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#1
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Mono Valve Repair Kit, what is your story?
Mono Valve Repair Kit, what is your story?
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ASE Master Mechanic https://whunter.carrd.co/ 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 2003 Volvo V70 https://www.boldegoist.com/ |
#2
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My story... the SD was missing the monovalve and aux water pump when I purchased it. The heat was ALWAYS on.
![]() I do not feel like spending $25 or whatever for the new monovalve guts, so I go used. ![]()
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I'm not a doctor, but I'll have a look. ![]() '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG] |
#3
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Its so easy to do you don't really need a pictorial FYI....it takes longer to get the spare tire out of the trunk..........but then..much of this stuff comes to me as second nature......
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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 |
#4
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I was surprised how easy it was to replace the monovalve. On the "Easy to Difficult Scale", I'd give it a ".5" It quickly becomes a "2" if you drop one or more of the screws in the abyss.
Have fun doing it. There are very few repairs that are this simple that can make such a difference in your car. Keith
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1983 300SD "Helga" |
#5
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![]() ![]() This is From TxBill's old site http://mbdieseldiy.tripod.com/monovalve.htm ![]() |
#6
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Quote:
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1983 300-D turbo 1985 300-D turbo 1959 Harley Panhead chopper 1929 Ford coupe restored I hang out with Boneheaddoctor at Schuman Automotive OBK#5 All liberals are mattoids but not all mattoids are liberal. |
#7
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I find these S-Class pretty easy to wrench on.
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I'm not a doctor, but I'll have a look. ![]() '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG] |
#8
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My biggest complaint is that the stupid flimsy diaphragm is not available by itself (apparently). Why did I have to spend $50 for the whole guts when all I really needed was a $.50 diaphragm.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#9
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Quote:
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1983 300-D turbo 1985 300-D turbo 1959 Harley Panhead chopper 1929 Ford coupe restored I hang out with Boneheaddoctor at Schuman Automotive OBK#5 All liberals are mattoids but not all mattoids are liberal. |
#10
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I love the monovalve compared to the old vac operated servo system I had in the SL. Never did get that thing working quite right.
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Adam Lumsden (83) 300D Vice-President of the MBCA International Stars Section |
#11
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I thought I'd have to repair mine this winter as last winter it was being mean to me and taking my heat away quite often, ironically, this winter it has given me heat every time I use it!
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-diesel is not just a fuel, its a way of life- ![]() '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#12
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I pulled one out of an '85 500SEL at the bone yard and dropped it into my 300SD. Now I have AC just in time for winter
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'81 300SD |
#13
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not to hijack but I just pulled two really nice ones from the yard. I only need one for the SD. The other is up for grabs. Pm me
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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 |
#14
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If I didn't have two spares, I'd be tempted to replace a broken mono valve with a standard manual ball valve. Open it in the winter. Close it in the summer. Sometimes, just sometimes, Mercedes over engineers a solution.
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Cheers! Scott McPhee 1987 300D |
#15
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FYI...
I only recently figured out my diaphragm was torn in my TD, so I robbed one from my SD. This could explain... despite replacing almost all of the a/c AND charging with R12 my TD would not get real cold. I only assumed the mono valve was good to go. ![]() And the easy rating isn't even on the scale IMHO. Headlight bulb is more difficult to get to.
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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 |
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