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Author Topic: Recommended DD two stroke antifreeze/coolant??  (Read 2707 times)
RickB
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« on: June 01, 2009, 06:23:32 AM »

Hey folks,

I was looking at a blog today where sean mentioned a "special diesel coolant" and he made a distinction between that and cheap antifreeze. I have never heard that we are supposed to be using anything other than 50% coolant mix of green over the counter antifreeze.
So, is there a "special" antifreeze for our motors??

He also mentioned it was expensive. Having just done my entire cooling system I found the green stuff gets fairly costly when you are talking about 10+ gallons.

Thanks,
Rick
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luvrbus
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« Reply #1 on: June 01, 2009, 06:37:24 AM »

Rick, nothing special about about the antifreeze in a 8v71 just a Ethylene base with low silicate drop out and keep your system in balance green stuff is fine has been since 1939 no need for the pre charged extended life antifreeze at over 20 bucks a gal. FWIW DD dealers sell both types    good luck
« Last Edit: June 01, 2009, 06:49:20 AM by luvrbus » Logged

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gumpy
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« Reply #2 on: June 01, 2009, 06:46:41 AM »

If you put in new over the counter antifreeze such as Prestone, you should pick up a jug of the DD additive and add to your system. JD has it.
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Lin
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« Reply #3 on: June 01, 2009, 08:49:35 AM »

My understanding is that diesels can have a problem with cavitation in the coolant system actually destroying the engine.  To avoid this, one can add a Supplemental Coolant Additive (SCA).  The one I have used is called Napa Kool, obviously from Napa.  There are others available too.  Cavitation may be more of a problem with wet liners than dry, but I use the stuff anyway.
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JohnEd
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« Reply #4 on: June 01, 2009, 11:11:28 AM »

The DD shop up in Coburg, Or. has a liner on the counter that was taken from a 8V92(same as 6V92) and it looks like a piece of Swiss Cheeze.....no kidding!  It is full of these little holes and channels and one has gone completely through the liner.  These engines NEED low silicate antifreeze specified for two strokes.  In all the time I have been reading this board, this is the first time I noticed anything about an additive to auto grade antifreeze that makes it compatible with 2 stroke wet sleeve engines.  I am no chemist but I still don't think adding something will eliminate something like silicone.  In my limited understanding, there are three types of antifreeze....auto grade, Diesel and two stroke diesel.  I hope that someone that knows will clear this up for me.

John
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kyle4501
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« Reply #5 on: June 01, 2009, 11:46:31 AM »

The 71 series are dry sleeved engines. Quite different than the wet sleeves of the 92 series.

Or, so I'm told . . . .
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luvrbus
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« Reply #6 on: June 01, 2009, 11:56:09 AM »

JohnEd, i think someone is pulling your leg only 2 inches of the 92 series liners come in contact with the coolant the rest is dry   

good luck
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Lin
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« Reply #7 on: June 01, 2009, 01:27:14 PM »

Another thing to worry about.

http://www.arrowheadradiator.com/cavitation,_scas_and_the_proper_maintenance_of_diesel_engine_cooling_systems.htm
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MCI-RICK
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« Reply #8 on: June 01, 2009, 02:05:32 PM »

Lin,

Real informative link on -  Cavitation, SCA'a and the proper maitenance of diesel engine cooling systems.

I saved that for future reference.  Thanks.

Rick
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jackhartjr
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« Reply #9 on: June 01, 2009, 02:17:05 PM »

Soo...if I read that right us 2 strokers don't have to worry about cavitation???
If so what do we want to use, any ole green antifreeze?
Jack
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Jack Hart, CDS
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gus
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« Reply #10 on: June 01, 2009, 08:01:04 PM »

Only green existed when most, if not all, 71s were born so there is no point in using anything else, especially if it is expensive.
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Airbag
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« Reply #11 on: June 01, 2009, 08:59:32 PM »

How many of us are using distilled water?
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jackhartjr
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« Reply #12 on: June 01, 2009, 09:34:34 PM »

Airbag, are you saying disstilled water only with no additives?
Thanks
Jack
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Jack Hart, CDS
1956 GMC PD-4501 #945 (The Mighty SCENICRUISER!)
8V71 Detroit
4 speed Spicer Trannsmission
Hickory, NC, (Where a call to God is a local call!)
Airbag
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« Reply #13 on: June 01, 2009, 10:08:58 PM »

Airbag, are you saying disstilled water only with no additives?
Thanks
Jack

No I mean to mix with the anti freeze. I am not using it but when I do a flush I think I will. It has no free oxygen molecules to corrode anything. I can attest to that I have some in an aluminum tank for years now and not speck of corrosion.
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jackhartjr
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« Reply #14 on: June 01, 2009, 10:14:41 PM »

Thanks, I appreciate that info!
Jack
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Jack Hart, CDS
1956 GMC PD-4501 #945 (The Mighty SCENICRUISER!)
8V71 Detroit
4 speed Spicer Trannsmission
Hickory, NC, (Where a call to God is a local call!)
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