Date: Thu, 29 Nov 2007 21:01:40 -0800
Reply-To: Scott Daniel - Shazam <scottdaniel@TURBOVANS.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Scott Daniel - Shazam <scottdaniel@TURBOVANS.COM>
Subject: Re: ONE MAN only out of many
In-Reply-To: <ac1f198b0711291646v361c36f1r70f2841ffee3c3c1@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Now we're talking, that sounds good.
I did post the other day, maybe only yesterday, that I use permatex red
Hi-Tach gasket sealer on the aluminum fitting before putting on the hose ,
and it reduces the contact between rubber and aluminum, and comes apart just
fine years later. I'd suggest trying this method. Sure works for me.
And with good products, and frequent coolant changes, no problems.
There's also another trick I've been doing on cars about 20 some years.
Water soluble oil. The kind machinists use to machine with .......makes a
perfect water pump lubricant and rust inhibitor. About a tea spoon or two
in a gallon of water that you use to make your 50/50 mix. This
SIGNIFICANTLY reduces corrosion in the cooling system.
I've probably done this to maybe 400 different cars, or even more, maybe a
thousand. No problems of any kind, ever.
The bottle I'm looking at from NAPA says 'grinding and cutting oil' on it.
It's water soluble. Makes the coolant look slightly milky. Great stuff.
Wouldn't dream of not putting it in a cooling system. I never get that
corrosion between rubber and aluminum either.
Forget where I picked up this tip, but it sure WORKS !
Scott
www.turbovans.com
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Jim Akiba
Sent: Thursday, November 29, 2007 4:46 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: ONE MAN only out of many
Whoops forgot to answer to the "how to stop it" part... it's tedious,
but loosening your clamps and moving the hose, thus removing the
"stagnant" coolant(losing some too) between the rubber/AL should
help... also using heavy grease and two hose clamps (one further up,
before adding coolant should theoretically help. The idea being DON'T
have any water/coolant in between the rubber and the hose at all. Not
sure it's worth it though... healthy coolant and timely changes and
hose replacements always seem to work for me.
Jim Akiba
On 11/29/07, Jim Akiba <syncrolist@bostig.com> wrote:
> To answer the most important question, it's likely the lack of
> movement of the coolant in that area. Check out this abstract on an
> sae tech paper titled "Investigation of Fluid Circulation Effect on
> the Internal Corrosion Resistance of Automotive Heater Core".
>
> The Al-Si cladding they talk about on the cores would be roughly
> equivalent to the common AL-Si alloys used in casting such parts as
> water pump inlets etc, so I don't see any reasons the last
> sentence(and more importantly its logical inverse) wouldn't also hold
> true. If you are interested in the exact mechanism that causes this, I
> can dig further.
>
> "An experimental test bench has been developed to study the effect of
> flow on the corrosion behavior of the internal surface of heater core
> tubes. The experimental device allows the electrochemical behavior of
> the system to be investigated under different liquid compositions,
> different temperatures (between 40 and 80°C) and different fluid
> velocities (between 0.5 m/s and 1.5 m/s) at different test duration
> (up to 100 h). The study is focused on the water side corrosion
> resistance of brazed AA4343/AA3003*/AA4343 material, i.e., the
> residual Al-Si cladding. The increase of the temperature has a
> preponderant influence on the corrosion rate by comparison with the
> variation of the fluid velocity. The increase of fluid velocity rather
> limits the corrosion degradation."
>
> Jim Akiba
>
>
>
>
> On 11/29/07, Zoltan Kuthy <zolo@foxinternet.net> wrote:
> > Probably the most important question to answer is; what makes corrosion
between rubber and aluminum? The other is; how to avoid it?
> > Although, I have put this question up more than once within a year,
nobody even attempted to try to answer it, but ONE.
> > This list is fighting and dreading this symptom the most, yet there is
not enough knowledge to know how to stop it.
> > Is there more than ONE out of the hundreds of members who knows, or at
least think he knows?
> > Anyone?
> > Zoltan
> >
>
| 
