[C320-list] FW: Re: Engine AntiFreeze

Thu Apr 20 09:25:11 PDT 2006

On the Yanmar 3GM30 F there are three pet cocks to drain, one high on the
starboard side, one near the oil filter on port, and another port one
further towards the stern.  They are diagramed in the engine manual. NOTE:
when I spoke with Mack Boring in the fall before changing my green prestone,
they recommended premixed Dexacool, but that all of the green had to be
washed out with 2-3 flushes before adding. If the Dexacool, which is orange,
mixes with the Green, then it can turn to sludge and destroy your engine. I
used fresh water from a hose to do the flushing since the plain water was
only in the system for a few minutes. The advantage to using the premixed
(for which you pay extra for the water!!) is to avoid having to make a
50%50% mix of distilled water and antifreeze, for which you would need a
large bucket and from which it would be awkward to pour. Both of these are
toxic and have to be disposed of safely, not overboard. My marina took mine.

-----Original Message-----
From: C320-List-bounces at catalina320.com
[mailto:C320-List-bounces at catalina320.com] On Behalf Of Russell Monaco
Sent: Thursday, April 20, 2006 11:09 AM
To: C320-List
Subject: Re: [C320-list] FW: Re: Engine AntiFreeze

along these lines-as someone who has never done anything but "top off" the
anti-freeze...how do you drain the anti-freeze on the yanmar engine (is this
the valve with a clear tube)??  and where do you put the anti-freeze while
draining??, and then what do you do with the anti-freeze once removed.....
  russ monaco

jonvez at comcast.net wrote:
  I use the regular Prestone green...I did recently 'upgrade' the the premix
version, so I don't have to do the hydrometer thing to get the 50/50 mix
right...I change every fall before layup with all other fluids....

Jon Vez

-------------- Original message -------------- 
From: "Chris Holt" 

> It sounds like some of you use the green stuff. What do you use? 
> Just any old car antifreeze. 
> 
> Chris 
> #447 
> 
> ----- Original Message ----- 
> From: "Karl Mielenhausen _/) " 
> To: 
> Sent: Tuesday, April 18, 2006 6:48 PM 
> Subject: Re: [C320-list] FW: Re: Engine AntiFreeze 
> 
> 
> > 
> > OD, 
> > 
> > 
> > 
> > I posed the exact question to Mack Boring... why change from green if we

> > are supposed to (and do) change coolant every year or two anyway? 
> > 
> > 
> > 
> > Karl Mielenhausen 
> > 
> > 2000 C320 Hull#690 "Silver Lining" 
> > 
> > New Bern, NC 
> > 
> > http://members.cox.net/mielen/ 
> > 
> > 
> > 
> > From: Orlando.Duran at AveryDennison.com [mailto: 
> > Orlando.Duran at AveryDennison.com] 
> > 
> > To: kmielen at iwon.com, C320-List at catalina320.com 
> > 
> > Date: Tue, 18 Apr 2006 15:23:13 -0700 
> > 
> > Subject: Re: [C320-list] FW: Re: Engine AntiFreeze 
> > 
> > 
> > 
> > Karl,

You have a lot of research time on your hands!! :)

My 
> > questions is, if you were to change your coolant each year (which I do),

> > why would you need an 'extended life' coolant? Is the change worth it? 
> > 

cuba libre 
> > 2
--------------------------
Regards,
OD

Sent from my 
> > BlackBerry Wireless Handheld

----- Original 
> > Message -----
From: C320-List-bounces
Sent: 04/18/2006 03:03 
> > PM
To: C320-List at catalina320.com
Subject: [C320-list] FW: Re: 
> > Engine AntiFreeze

The DEX-COOL-type antifreeze that Yanmar now 
> > apparently recommends would be the ORANGE antifreeze. Dexcool is an 
> > OAT-based extended-life coolant (OAT stands for Organic Acid
Technology). 
> > DEX-COOL is a trademark of General Motors. Look for "DEX-COOL approved"
on 
> > the label. Some brands are: Prestone Extended Life 5/150, Havoline 
> > DEX-COOL, Zerex Extreme Life 5/150, Pennzoil® DEX-COOL® Extended Life. 
> > DEX-COOL-type antifreeze is a ethylene glycol, diethylene 
> > glycol blend without silicate, phosphate, or borate inhibitors. 
> > 

The RED antifreeze is an extended life coolant also, but 
> > does NOT carry the DEX-COOL label. It appears to be ethylene glycol
based 
> > with the OAT inhibitors.

>From what I have read, mixing the 
> > orange with residual green can cause cause dilution of the OAT
inhibitors 
> > at best and precipitation of the EG's silicates at worst. In other
words, 
> > make sure all traces of the green is gone. I would expect red to have
the 
> > same problems since it is OAT-based. I've seen some hybrid formulas 
> > marketed as being compatable with all types. I believe the hybrids are 
> > YELLOW!!

DO NOT CONFUSE ANY OF THESE WITH THE ANTIFREEZE 
> > SOLUTIONS USED TO WINTERIZE (FREEZE-PROOF) WATER LINES.

I 
> > am confirming Yanmar's recommendations with an email to Mack Boring 
> > tonite. Will report on what they have to say.

Karl 
> > Mielenhausen

2000 C320 Hull#690 "Silver 
> > Lining"

New Bern, 
> > NC

http://members.cox.net/mielen/

From: Russell 
> > Monaco [mailto: russgm at yahoo.com]

To: 
> > C320-List at catalina320.com

Date: Tue, 18 Apr 2006 13:42:34 -0700 
> > (PDT)

Subject: Re: [C320-list] Engine AntiFreeze

me 
> > too...by the way i have read all about the difficulty in switching over 
> > too, i just wonder, what would really happen if you just mixed the two? 
> > anyone know? would it explode or something?
russ monaco

Chris 
> > Holt wrote:
What do people use for 
> > antifreeze in their Yanmars?
I know about the red Dexcool stuff but 
> > right now I have the green stuff and I don't want to switch over (at
least 
> > not right now).
I just need to "top it 
> > off".

Thanks,

Chris
#447
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