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From: lobo on 11 Sep 2008 15:14
Just replace a freeze out plug on my 97 4 cylinder. I have religiously used
Toyota Red and distilled water and changed it out every 3 years.The plug was
pitted deeply on one side of the inside.
Go figure????
Wonder how long I have on the rest of them? This one was the easiest.(front
right on the block)


From: mack on 11 Sep 2008 17:43

"lobo" <lobo(a)lobo.com> wrote in message
news:sqidnZJyvdSH81TVnZ2dnUVZ_rPinZ2d(a)earthlink.com...
> Just replace a freeze out plug on my 97 4 cylinder. I have religiously
> used Toyota Red and distilled water and changed it out every 3 years.The
> plug was pitted deeply on one side of the inside.
> Go figure????
> Wonder how long I have on the rest of them? This one was the
> easiest.(front right on the block)

You'll know that when a puddle appears on your driveway (or in a motel
parking lot 1500 miles from your home) : - (
>


From: johngdole on 11 Sep 2008 20:38
3 years on the Red is a bit long. It should be 2 years max. Actually
by 1.5 years it becomes iffy checking with the hydrometer. The new
pink coolant (similar to GM's Dexcool but without the 2EHA acid -- a
fast-acting rust inhibitor, but also a potent plasticizer), should
last *up to* 5 years, but has been shown to have significant [metal]
"weight loss" in corrosion tests.

There are a couple things besides coolant's time-in-service:

1. Is there stray current into the cooling system (all ground straps
working?)
This causes electrolysis and basically turns the cooling system into a
battery. The electro-chemical degradation eats things inside out.

"Make sure that the positive probe is only touching the coolant. If
the voltmeter displays 400mv (.4v) DC or greater then the cooling
system needs to be flushed." See:
http://www.alldata.com/techtips/Miscellaneous/20051024b.html

2. Does the radiator cap have a spring-loaded vacuum return valve
(constant pressure cap)?
There may be no choice on the shelf of the parts store, but plastic
hang-loose type (atmospheric pressure cap) allows air into the system,
helps corrosion. I've seen different batches of constant/atmo caps
for the 4cyl with the 0.9 ATM type.



On Sep 11, 12:14 pm, "lobo" <l...(a)lobo.com> wrote:
> Just replace a freeze out plug on my 97 4 cylinder. I have religiously used
> Toyota Red and distilled water and changed it out every 3 years.The plug was
> pitted deeply on one side of the inside.
> Go figure????
> Wonder how long I have on the rest of them? This one was the easiest.(front
> right on the block)

From: ransley on 12 Sep 2008 00:24
On Sep 11, 2:14 pm, "lobo" <l...(a)lobo.com> wrote:
> Just replace a freeze out plug on my 97 4 cylinder. I have religiously used
> Toyota Red and distilled water and changed it out every 3 years.The plug was
> pitted deeply on one side of the inside.
> Go figure????
> Wonder how long I have on the rest of them? This one was the easiest.(front
> right on the block)

You will know when the motor suddenly overheats, blowes steam, and
seizes when you are on the highway and cant stop, in the "Bad
Neighborhood"
From: lobo on 12 Sep 2008 14:54
Checked for stray voltages. Looks OK nothing between the negative terminal
and various places on the block. Nothing approaching 400mv between the
negative terminal and the coolant.
The old plug does look like there was galvanic action going on ie the
pitting was on one side of the plug, although I don't really know what rust
only corrosion would look like.

What about a sacrificial zink in the resorvoir.. L.O.L...


<johngdole(a)hotmail.com> wrote in message
news:3d4bc973-1c57-4ecd-adce-3dc2b37c15ee(a)a2g2000prm.googlegroups.com...
3 years on the Red is a bit long. It should be 2 years max. Actually
by 1.5 years it becomes iffy checking with the hydrometer. The new
pink coolant (similar to GM's Dexcool but without the 2EHA acid -- a
fast-acting rust inhibitor, but also a potent plasticizer), should
last *up to* 5 years, but has been shown to have significant [metal]
"weight loss" in corrosion tests.

There are a couple things besides coolant's time-in-service:

1. Is there stray current into the cooling system (all ground straps
working?)
This causes electrolysis and basically turns the cooling system into a
battery. The electro-chemical degradation eats things inside out.

"Make sure that the positive probe is only touching the coolant. If
the voltmeter displays 400mv (.4v) DC or greater then the cooling
system needs to be flushed." See:
http://www.alldata.com/techtips/Miscellaneous/20051024b.html

2. Does the radiator cap have a spring-loaded vacuum return valve
(constant pressure cap)?
There may be no choice on the shelf of the parts store, but plastic
hang-loose type (atmospheric pressure cap) allows air into the system,
helps corrosion. I've seen different batches of constant/atmo caps
for the 4cyl with the 0.9 ATM type.



On Sep 11, 12:14 pm, "lobo" <l...(a)lobo.com> wrote:
> Just replace a freeze out plug on my 97 4 cylinder. I have religiously
> used
> Toyota Red and distilled water and changed it out every 3 years.The plug
> was
> pitted deeply on one side of the inside.
> Go figure????
> Wonder how long I have on the rest of them? This one was the
> easiest.(front
> right on the block)


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