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#1
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126 mono valve aggravation
Glad someone on the site put a heads up about bad aftermarket mono valves. Finally got fed up and cut the bottom cone shaped seal off. Heater works fine now. Is there some way to buy/find a valve that actually works? I can't find a Bosch valve anywhere. Or is there a permanent fix other than what I did?
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#2
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I've had a couple of 123's in lately with heating issues and came up on the bad monovalves. Tell me more about removing the bottom seal to make em work.
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Jim |
#3
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There is a tiny c clip that holds the bottom seal and mesh piece on the spring loaded plunger shaft. Pull that off and there'll be guaranteed MAX HEAT!!
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Current fleet 2006 E320 CDI 1992 300D - 5speed manual swapped former members 1984 300D "Blues Mobile" 1978 300CD "El Toro" |
#4
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Thanks, I will check it out tomorrow.
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Jim |
#5
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Still a work in progress. you can get max heat with the above but the mono valve won't function to regulate heat. I am going to modify the rubber seal. I will let folks know how it works.
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#6
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Quote:
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#7
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Apparently there is something I'm still missing here. Am I correct that with no current the valve is open (max heat). Why doesn't this valve work? Does the valve get stuck in the hole or does the negative pressure created by water flow suck it shut? Trying to see how to fix this so the valve works correctly. Is this company a division of URO? It is hard enough figuring how to fix these cars when the parts work!
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#8
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Something like that. The spring is too week to resist the flow.
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Current fleet 2006 E320 CDI 1992 300D - 5speed manual swapped former members 1984 300D "Blues Mobile" 1978 300CD "El Toro" |
#9
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Quote:
I find it hard to believe a weak spring can stop flow due to water current. Until I inspect one that actually does that, I am not buying it. I suspect it is due to other causes.
__________________
85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#10
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Quote:
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#11
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poking around on the internet I found a valve made by Vollig. Has anyone tried these?
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#12
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Quote:
I just went through my own mono valve saga and I am certain that weak spring was the cause and removing the lower seal from the plunger shaft was a definite fix for the short term. New MTC valve kit restored normal operation and is working as it should so far.
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Current fleet 2006 E320 CDI 1992 300D - 5speed manual swapped former members 1984 300D "Blues Mobile" 1978 300CD "El Toro" |
#13
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Quote:
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#14
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I mean one that works, have tried two already that don't.
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#15
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Quote:
The monovalve can be tested on the be bench. With no power, connect horizontal inlet port via hose to faucet. It should flow out the bottom outlet port with faucet on low. If you turn up the water pressure, it should continue to flow. If not, then it may be due to a weak spring. Did you/ can you run such a test? While water is flowing, applying power should stop flow. If you run the faucet into the outlet port, the check valve should prevent flow out of the inlet port if working properly.
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked Last edited by funola; 12-11-2014 at 12:51 PM. |
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