FWIW ;
I was flushing the cylinder block with the thermostat housing removed , every time I hooked up my auxiliary water pump harness , that's when the foamy crud came roaring out of the opening ~ .
I've been trying to talk Tom into ordering up several hundred $'s worth of new hoses and seals etc. so we can do this once & for all , remembering all the not fun I had with my cars when I bought them .
I also collected yet another bunch of " Just So " original Mercedes hose clamps @ P-A-P and his car has almost all matching size & correct hose clamps on it again...
I too was thinking the used thermostat was bad & stuck open but since we didn't have a new special O-Ring , I didn't want to pry it loose from the housing...
We saved his old one and will use it when he gets a big boxfull of new parts...
-Nate
Tom wrote:
>
> As Nate mentioned, we went looking for a wagon door to fix the window in
> his 300TD. No Joy.
>
> Afterwards, just before the sun went down, Nate finished the flush job
> on my 300SD. It has been running for 3 weeks on fresh anti-freeze, after
> he did the citrus flush and distilled water reflush, getting out tons of
> junk. But in that three weeks, the anti-freeze has turned very dark and
> opaque, strongly suggesting that the flush had loosened stuff up but not gotten
> it all out.
>
> So, he drained it, and it came out full of mud. Pulled the radiator
> hoses off and flushed and back flushed the radiator, more mud and gunk. The
> flushed and back flushed the block, more gunk and while back flushing, a
> lot of foamy suds from the citrus residue.
>
> After a lot of just hose flushing, he filled it a few times with
> distilled water and I ran it up the hill and back. Finally, we refilled it with
> anti-freeze.
>
> During most of the operation, he kept the aux water pump running, to
> keep the heater core flushed as well.
>
> One of the problems he spotted last time was that the hose bib on the
> thermostat housing was corroded pretty badly. While walking the yard, we
> found a better one, with a good looking thermostat in place. He slapped
> that on after flushing the block.
>
> Now I have put 100 miles on since the flush and the temperature hasn't
> yet reached "80" on the guage. Mostly it hovers between the hash mark at
> "40" and the one just above that. I'm beginning to wonder if that 'new'
> thermostat never closes?
>
> I have to sa that all the gunk that came out the flush job occupied a
> huge volume. So I'm thinking that he flushed it up toy at least a 3.5
> liter engine. Maybe even a 4.2!
>
> After the flush, the odometer clocked over 348,800 miles. Still a lot
> of original parts still ticking away there.
>
> Today, while Nate was chillin with Shirley out in Fontuckey, I
> wandered through the yard at the intersection of the 110 and the 91 freeways. Not
> a single 300TD in the place. Several 126s and more recent sedans and
> convertibles, and one 116SD. But not one 123 in the whole yard!
>
> Tom
>
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