Only if the previous installer was not paying attention and did a lousy job. Pop it open (4 screws and 5 minutes) and look.
brian from la verne, ca
From: n61cm <jim@tazwade.com>
To: diesel_mercedes@yahoogroups.com
Sent: Thursday, October 6, 2011 7:50 AM
Subject: [diesel_mercedes] Re: Monovalve repair 84 300D
Thanks for the info. But do the guts of these valves ever get corroded so much that a new valve won't seat properly and thus allow coolant to leak through continuously?
Jim
--- In diesel_mercedes@yahoogroups.com, audiolaw@... wrote:
>
> Jim,
>
> Monovalves are among the easiest service tasks that you can do. The
> valve is easy to find and work on on the 123 (much easier than on the 126).
>
> You can either replace just the active part, by removing the four
> screws on the top of the valve body and lifting it out (remember to unplug it
> first. Then drop a 'new' one in, reinstall the screws, connect the plug and
> you're good to go.
>
> Or you can pull the whole thing by unplugging, then disconnecting the
> water hoses, then dismounting. Install the 'new' one.
>
> I say 'new' instead of new, because these are easily pulled from cars
> in P-a-P yards. You can open the valve up (remove the four screws) and see
> if the rubber is OK, and see if the channels look clean or clogged.
> CHEAP, CHEAP, CHEAP. And good exercise walking the yard.
>
>
>
>
> In a message dated 10/6/2011 7:01:58 A.M. Pacific Daylight Time,
> jim@... writes:
>
>
>
>
> Howdy, the monovalve on my 84 300D lets coolant through all the time, never
> completely shuts it off, raises the air temp 10 - 15 degrees at its
> coldest setting when it should be shut off. The valve was replaced a couple years
> ago by a Mercedes shop. Seems too soon for it to have gone bad, but who
> knows.... I see that those valves have rubber washers or o-rings or whatever
> rubber parts on them to create the seal to stop the flow of coolant, and
> was wondering if there is a seat inside the monovalve housing that could be
> pitted or corroded that could be causing the rubber parts of the valve to
> not seal properly. I have never taken one of these apart. Any advice is
> appreciated. I'd like to fix this once and be done with it for a while.
>
> Thanks,
>
> Jim
>
Jim
--- In diesel_mercedes@yahoogroups.com, audiolaw@... wrote:
>
> Jim,
>
> Monovalves are among the easiest service tasks that you can do. The
> valve is easy to find and work on on the 123 (much easier than on the 126).
>
> You can either replace just the active part, by removing the four
> screws on the top of the valve body and lifting it out (remember to unplug it
> first. Then drop a 'new' one in, reinstall the screws, connect the plug and
> you're good to go.
>
> Or you can pull the whole thing by unplugging, then disconnecting the
> water hoses, then dismounting. Install the 'new' one.
>
> I say 'new' instead of new, because these are easily pulled from cars
> in P-a-P yards. You can open the valve up (remove the four screws) and see
> if the rubber is OK, and see if the channels look clean or clogged.
> CHEAP, CHEAP, CHEAP. And good exercise walking the yard.
>
>
>
>
> In a message dated 10/6/2011 7:01:58 A.M. Pacific Daylight Time,
> jim@... writes:
>
>
>
>
> Howdy, the monovalve on my 84 300D lets coolant through all the time, never
> completely shuts it off, raises the air temp 10 - 15 degrees at its
> coldest setting when it should be shut off. The valve was replaced a couple years
> ago by a Mercedes shop. Seems too soon for it to have gone bad, but who
> knows.... I see that those valves have rubber washers or o-rings or whatever
> rubber parts on them to create the seal to stop the flow of coolant, and
> was wondering if there is a seat inside the monovalve housing that could be
> pitted or corroded that could be causing the rubber parts of the valve to
> not seal properly. I have never taken one of these apart. Any advice is
> appreciated. I'd like to fix this once and be done with it for a while.
>
> Thanks,
>
> Jim
>
> jim@... writes:
>
>
>
>
> Howdy, the monovalve on my 84 300D lets coolant through all the time, never
> completely shuts it off, raises the air temp 10 - 15 degrees at its
> coldest setting when it should be shut off. The valve was replaced a couple years
> ago by a Mercedes shop. Seems too soon for it to have gone bad, but who
> knows.... I see that those valves have rubber washers or o-rings or whatever
> rubber parts on them to create the seal to stop the flow of coolant, and
> was wondering if there is a seat inside the monovalve housing that could be
> pitted or corroded that could be causing the rubber parts of the valve to
> not seal properly. I have never taken one of these apart. Any advice is
> appreciated. I'd like to fix this once and be done with it for a while.
>
> Thanks,
>
> Jim
>
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