I cheated on mine, while I was waiting to get to a PaP (rare beasts hereabouts) I put a ball valve between the pump and valve. That let me shut off the water in summer. Now I have a good MV I just leave the valve open.
Incase leaving the valve shut for the summer was hard on the heater water pump, I carry a spare water pump too, courtesy $5.00 @ PaP.
--- In diesel_mercedes@yahoogroups.com, Alan Boucher <alstheone@...> wrote:
>
> On 10/6/2011 5:01 PM, BStromsoe wrote:
> > As I recall, things can be put back incorrectly. I seem to remember
> > putting that heavy washer in wrongly once. Suggest you get a blowup of
> > the diagram, or look at one that is working, or take one apart at a
> > PAP. Heck, I may even take my wifes apart tomorrow morning. Seems to
> > me I have some pics on Picasa too, or even in this groups photo
> > spread. Look here for "Brians xxx" as I posted 10 or 12 fix it pics in
> > the past.
> > brian from la verne, ca
> > ----------------------------------------------------------
> > *From:* n61cm <jim@...>
> > *To:* diesel_mercedes@yahoogroups.com
> > *Sent:* Thursday, October 6, 2011 12:26 PM
> > *Subject:* [diesel_mercedes] Re: Monovalve repair 84 300D
> >
> > That's another thing I'm wondering about. I'm always a bit concerned
> > about putting things back the way they came apart -- if they had
> > previously been taken apart and put together by someone else who
> > didn't know what they were doing. Maybe two years isn't unusual
> > failure for this part but I think it's premature, which makes me
> > wonder if it was installed incorrectly or something, although from
> > what I can tell, it would be hard to install it incorrectly, unless
> > that wavy washer can be put in the wrong place (or left off entirely).
> > As far as I can tell, the first one lasted 30 years, but who
> > knows...maybe they just break a lot. They are certainly sold
> > everywhere, that's for sure. Any difference in brands? Maybe I should
> > buy a $40 Indian Bosch vs $26 Chinese alt brand.
> >
> > Jim
> >
> > --- In diesel_mercedes@yahoogroups.com
> > <mailto:diesel_mercedes%40yahoogroups.com>, BStromsoe <bstromsoe@>
> > wrote:
> > >
> > > Only if the previous installer was not paying attention and did a
> > lousy job. Pop it open (4 screws and 5 minutes) and look.
> > >
> > > Â
> > > brian from la verne, ca
> > >
> > >
> > > ________________________________
> > > From: n61cm <jim@>
> > > To: diesel_mercedes@yahoogroups.com
> > <mailto:diesel_mercedes%40yahoogroups.com>
> > > Sent: Thursday, October 6, 2011 7:50 AM
> > > Subject: [diesel_mercedes] Re: Monovalve repair 84 300D
> > >
> > >
> > > Â
> > > 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
> > <mailto:diesel_mercedes%40yahoogroups.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
> > > >
> > >
> > >
> > > 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
> > > >
> > >
> >
> > 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
> > > >
> > >
> > >
> > > 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
> > > >
> > >
> >
> >
> >
> >
> Putting things back the way they came apart takes all of the fun out of
> life.
>
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