This is a tangent off the original question, but does anyone know what
to do with the old antifreeze? My city will take motor oil but not antifreeze.
It’s been holding me back from changing it out lately, but I really need to
do in the spring.
Thanks,
Jim ReinardyC&C 30-2 “Firewater”Milwaukee, WI
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On Sun, Nov 18, 2018 at 9:16 AM -0600, "Bruce Whitmore via CnC-List"
<cnc-list@cnc-list.com> wrote:
Hello Robert,
Below is a post I put on the board about a month ago, which speaks to the issue
of the coolant itself. Your boat may be sufficiently old that all its ever had
is the standard green antifreeze, but nonetheless, you will probably find this
interesting. In the end, rather than having the concern about Dextron
antifreeze causing head gasket leaks hang over my head, I am going to go with
the newer "universal" long-life coolant, which I believe is yellow (though the
color means nothing anymore). As for the frequency of coolant changes, Yanmar
now recommends changing it EVERY YEAR even if it is long-life coolant. The
primary job of coolant (other than keeping it from freezing) is stopping
corrosion in the engine, and coolant breaks down over time (especially the old
style green coolant). This is why they developed "long life" coolant which is
supposedly good for 5 years.
So, I'll probably plan on replacing the coolant every 2 years at the same time
I replace my impeller.
Hope you find the reading below helpful.
Hello all,
As
a result of a concern about tracking down a potential antifreeze leak
(which I haven't done yet), I wanted to confirm the coolant type. There
is no mention as to specific types either in my 3JH2E operating or
service manuals. Yes, I could go (way) out of my way to get Yanmar
branded coolant, but let's face it - it is not only way more expensive,
its available almost exclusively at Yanmar dealers, and the nearest one
to me is 15 miles away and isn't open on Saturdays or Sundays. And of
course, what happens if you need more when you're out cruising?
In doing research, I found the following bulletin, published by Mack Boring:
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&ved=2ahUKEwizh_zu8Y3eAhWOy1MKHSFlD3cQFjADegQIBxAC&url=http%3A%2F%2Fldmarineservice.com%2Ffiles%2Fyanmar_bulletins.pdf&usg=AOvVaw3WK3R6vfJyTHOt5yGzFMDZ
In the section about coolants, it recommends:
Texaco
Long Life Coolant, numbers 7991 and 7998. Unfortunately, one really
can't find either product on the web, so I can't seem to find if it was
orange (DEXCOOL) or red for diesels, or for that matter if it was
ethylene glycol or propylene glycol based.
Havoline Extended Life Anti-Freeze/Coolant, number 7994. Per this link, 7994
is DEX-COOL, but is ethylene glycol based.
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=2ahUKEwij_o2I843eAhWK0FMKHXc5AfMQFjAAegQICxAC&url=http%3A%2F%2Fwww.rialtainfo.com%2Fvw%2Fvw_images%2Fradiator_%26_coolant.pdf&usg=AOvVaw3ZxHApMqFHHgB-qcUwOYWa
Dex-Cool
Long Life Coolant, which at least at the time of introduction was
propylene glycol based and is Organic Acid Technology (OAT) thus meaning
less toxic. Funny thing is, Dex-Cool was not even introduced until a
year after my boat was built (1995) and at the time, was only being used
in GM cars.
Prestone Extended Life Coolant, product code AF888. Per the attached, guess
what, it's Dex-Cool.
https://www.autozone.com/antifreeze-radiator-additives-and-windshield-wash-fluid/antifreeze/prestone-antifreeze-engine-coolant/87934_0_0.
It is ethylene glycol based, but Prestone says it is OAT, which would
seem to conflict with what I can find about traditional Dex-Cool.
Not
entirely satisfied, I wanted to see what a Yanmar official publication
recommended. In a 2009 JH Series Operation Manual, it recommends Texaco
7997 and 7998 (same as above). It also recommends Havoline 7994, as
above. It however says nothing about Dex-Cool or Prestone AF888. I get
similar results in a 3JH4E manual.
Then,
of course, I was faced with the fact that while I used Prestone AF888
when I flushed and replaced my coolant, I was replacing what appeared to
be traditional green coolant (presumably old-style ethylene glycol). I
only now read a lot of horror stories of replacing green with orange
Dex-Cool, saying that one can never flush out the system sufficiently to
keep the orange coolant from gelling to the point the engine
overheats.
So,
at this point I have no real idea what to thing other than the Prestone
AF888 I used should be OK as long as it doesn't a). Turn color B) Gel
up and c) My engine temperature stays OK.
Sigh...
Does anyone else here have anything more authoritative? (In the end I did not
receive any posts that were more authoritative)
Bruce Whitmore
1994 C&C 37/40+ "Astralis"
(847) 404-5092 (mobile)
bwhitm...@sbcglobal.net
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every one is greatly appreciated. If you want to support the list - use PayPal
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