[W126 Coupe] Thermostat R&R for 85 500 SEC

[David Fatovic]

Yes it has the pin off to the side. Another thing
about it is the gasket has to be fitted around the
whole piece, not just set on it. there is a groove on
the inside of the gasket for the metal ring of the
thermostat.

As for cutting the pin? Not sure. Part of me rhinks it
is on there fo a reason. I will let you know about
that. I have seen it in the older cars to gain temp
then fall back once the coolant starts running.

David
--- mbcoupes-bounces at mbcoupes.com
<rishayegan at davidson.edu> wrote:
>  
> I just noticed this is about an 85 500. Isn't the 85
 500 like the 380 
> in that the thermostat has the pin coming out of the
side? My mechanic 
> said that unless someone cuts that pin off, you're
going to get the temp 
> changing when you stop and stuff like that (and that
you also get the 
> thing where on a cold start it'll first go up to 100
and then quickly 
> back down to 82). He said that while people will cut
those pins off its 
> not the best idea. And he was saying this when I
asked him why this was 
> happening after I replaced my thermostat, so it's
not like he was 
> covering up for his own mistake or something.
> 
> ________________________________
> 
> From: mbcoupes-bounces at mbcoupes.com on behalf of
David Fatovic
> Sent: Tue 12/20/2005 5:18 PM
> To: Mercedes Coupes Mailing Lists
> Subject: Re: [W126 Coupe] Thermostat R&R for 85 500
SEC
> 
> 
> 
> Bob,
> 
> All good except one thing (that I found out the hard
> way).  On the water pump in my 85 the thermostat
does
> not sit on the side of the water pump like in later
> models.  It sits on top!.  All went fine except one
of
> my gaskets (since I pulled the side off and didn't
> need to) has failed.  I have to replace that and I
am
> all good.
> 
> David
> 
> --- Robert Cavazos <jazzman_390 at yahoo.com> wrote:
> 
> > David, it's been a while since I replaced one, but
a
> > couple of things come to mind:
> >   1. Go easy on the three bolts getting them
> > out--wouldn't want to snap them off.
> >   2. When installing the new stat, make sure the
> > little hole in it is at the 12 o'clock position.
> >   3. Use anti-seize on the bolts when
re-installing.
> >   4. Mix the coolant & water 50/50. Don't just
dump
> > a gallon of  coolant in the system and then top of
> > with water. And use MB coolant.
> >   5. Replace the radiator cap with a proper
pressure
> > one. Replace any  hoses that are bulged out, or
> > hard. If it's been several years, you  might want
to
> > consider replacing them all at this time.
> >   6. Tighten the hoses. I did my wife's SL t-stat
> > and all hoses but  didn't tighten them enough.
Found
> > most all of them all leaking when I  pressure
tested
> > the system later. Funny thing was there were no
> > visible  leaks prior to the test.
> >   7. Check the radiator level daily for the next
> > week.
> >
> > David Fatovic <coloradocroat at yahoo.com> wrote:  I
> > need to replace the thermostat in my 85.  The
engine
> > does not ever reach any sort of operating temp, I
> > believe the thermostat is stuck open. 
> >
> > Is there anything I need to watch out for?  Any
good
> > tricks?  Anything to avoid?
> >
> > David
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> >
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