[AT] Back (D Case stuck)

[charles bridges]

Now this is one of the things I like about this list.  Finally got an
explaination that makes sense to me.
Thanks Spencer and All!
----- Original Message ----- 
From: "Spencer Yost" <yostsw at atis.net>
To: <at at lists.antique-tractor.com>
Sent: Friday, November 12, 2004 2:13 PM
Subject: Re[6]: [AT] Back (D Case stuck)


> *********** REPLY SEPARATOR  ***********
> On 11/12/2004 at 9:05 AM bwhdon wrote:
> >on the coolant, being no expert on it at all I was wondering does
> >anit-freez allow rusting? I know water can cause oxidation . Hopefully
> most of us are
> >using anit freeze in our tractors in the winter?
>
>
> Not pure antifreeze obviously but any anti-freeze that has had water mixed
> with it(all of us a 50-50 I suspect) will rust metal if the water gets
> separated(mainly) or rests on naked steel and exposed to open air.
> Cooling systems are not exposed to air and the rust inhibitors are for
> tying up available oxygen in the water - they will not prevent contact
rust
> in situations exposed to air.  You can see coolant mixtures causing rust
> very nicely when you remove a cylinder head and don't remove/wipe up any
> splashed coolant.  Splash a few drops of 50-50 coolant mixture from the
> head into the cylinder, think nothing of it and you will have a rust spot
> tomorrow.
>
> In rust lock-ups caused by coolant leaks, here is what happens:  An engine
> is turned off and a leak starts slowly dripping into a warm cylinder.  The
> warm cylinder evaporates a bit of water from the coolant mixture.  Then
the
> air in the cylinder reaches 100% humidity as it cools and the metal
> surfaces then condense the vapor and the water is now separated.   The
> condensation runs back down and either stratifies under the coolant or
runs
> away from it if the amount of coolant mixture is small and doesn't cover
> the entire top of the pistons and rings (other side of the piston or
> whatever).  The water runs down along the pistons and viola.  Rust and
> galling start.
>
> Very small leaks and running-only leaks combined with a regularly used
> tractor don't exhibit this but a head gasket leak that is more than tiny
on
> a tractor that sits may exhibit this.   Again, it would take a while to
> really lock it up but enough to make it "pop" loose?   Might not take too
> long.
>
> Of course, now that we know the valve situation I doubt it is anything but
> the valve.
>
> Spencer Yost
> Owner, ATIS
> Plow the Net!
> http://www.atis.net
>
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