Re: Stus-List Yanmar Coolant

[Alan Liles via CnC-List]

I’m using Yanmar premixed coolant which I get from my local marine store at a 
reasonable price. I changed mine last week after three years and the old stuff 
looked the same as the new. There are about 200 hours since the last change so 
it was time. 

Al Liles
SV Elendil 
C 37/40+
Vancouver BC


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Re: Stus-List Yanmar Coolant

[dwight veinot via CnC-List]

I can honestly say that I have never intentionally changed the coolant in
any vehicle that i have owned including cars trucks and boat engines. Fresh
water cooling systems are closed systems so unless you get a leaky hose or
fitting that necessitates repair and replenishment the anticorrosion
additives in the ethylene glycol last a long time. I once had a heat
exchanger on my boat’s diesel leak Coolant but i am certain that was due to
corrosion from the salt water side.

On Wed, Jun 3, 2020 at 10:23 AM Bruce Whitmore via CnC-List <
cnc-list@cnc-list.com> wrote:

> Hello Glen,
>
> Below is a post from the end of 2018.  The first paragraph is what I
> finally decided on, and with which I am ultimately the most comfortable.
> The remaining paragraphs outline all the research I could find on the
> subject, which, in the end, didn't really lead me to a definitive answer.
>
> Hello all,
>
> 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 is yellow
> (though 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=j==s=web=4=2ahUKEwizh_zu8Y3eAhWOy1MKHSFlD3cQFjADegQIBxAC=http%3A%2F%2Fldmarineservice.com%2Ffiles%2Fyanmar_bulletins.pdf=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=j==s=web=1=2ahUKEwij_o2I843eAhWK0FMKHXc5AfMQFjAAegQICxAC=http%3A%2F%2Fwww.rialtainfo.com%2Fvw%2Fvw_images%2Fradiator_%26_coolant.pdf=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.  Prestone Dex-Cool Extended Life Concentrate
> Antifreeze and Coolant 1gal
> .
> 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 

Re: Stus-List Yanmar Coolant

[Bruce Whitmore via CnC-List]

Hello Glen,
Below is a post from the end of 2018.  The first paragraph is what I finally 
decided on, and with which I am ultimately the most comfortable.  The remaining 
paragraphs outline all the research I could find on the subject, which, in the 
end, didn't really lead me to a definitive answer.  

Hello all, 

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 is yellow (though 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=j==s=web=4=2ahUKEwizh_zu8Y3eAhWOy1MKHSFlD3cQFjADegQIBxAC=http%3A%2F%2Fldmarineservice.com%2Ffiles%2Fyanmar_bulletins.pdf=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=j==s=web=1=2ahUKEwij_o2I843eAhWK0FMKHXc5AfMQFjAAegQICxAC=http%3A%2F%2Fwww.rialtainfo.com%2Fvw%2Fvw_images%2Fradiator_%26_coolant.pdf=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.  Prestone Dex-Cool Extended Life Concentrate Antifreeze 
and Coolant 1gal.  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 gelled 
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 37/40+ "Astralis"
(847) 404-5092 (mobile)
bwhitm...@sbcglobal.net


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Re: Stus-List Yanmar Coolant

[bwhitmore via CnC-List]

Please bear with me, I have a lot of information but I will have to wait until 
tomorrow.More to come,   Bruce Whitmore Sent from my T-Mobile 4G LTE Device
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Stus-List Yanmar Coolant

[Glenn Henderson via CnC-List]

>
> My Yanmar 3JH4E owner's manual specifies Havoline 7994 coolant or Texaco
> 7997 or 7998 coolant. I have scoured the internet an cannot find a
> replacement coolant. Does anyone have a solution?



> I queried a few weeks ago about losing coolant. I found a spring valve on
> a siphon loop going to my water heater was leaking. I have a water heater
> on our boat, not a "hot" water heater. I find it useless to reheat hot
> water.


Thanks,

Glenn Henderson
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