[AT] Back (D Case stuck)

[bwhdon]

I see that cavation is a problem in some engines that have anti freeze in
them, but it seems that an additive is used to boost the ph levels found in
engine coolants to prevent the oxidation of cylinders, coolant filters
usally have this additive in them.

I install 50-50 antifreez in my hit miss engine though the winter to help
prevent craking and rusting and some of the engines water tanks are exposed
to free air .  I guess I am wrong on using this to prevent the rusting??

Don


----- Original Message -----
From: "Spencer Yost" <yostsw at atis.net>
To: <at at lists.antique-tractor.com>
Sent: Friday, November 12, 2004 11:13 AM
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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