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12-04-2015, 02:17 PM
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#1
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Senior Member
City: San Francisco
Vessel Name: Shellbourne
Vessel Model: 1978 Mainship 34 Perkins T6.354
Join Date: Dec 2014
Posts: 171
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Diesel Coolant: OAT vs HOAT; Red vs Blue?
I'm about to reassemble my freshwater cooling system and am utterly confused as to which coolant to use. This is a 1977 Perkins T6.354. Recent articles on diesel coolant state a special "OAT" formulation is required to prevent pitting, especially with wet sleeved engines.
I believe this motor is dry sleeved, but I'm stuck in analysis/paralysis. After one article I should definitely use OAT, then another it's NOAT, then another it's HOAT, then another says it doesn't matter because they're actually dry sleeves. Then something else comes along and says I should use straight water with Redline WaterWetter or Purple Ice.
There was brown sludge lining some of the internal plumbing and I've read that's caused by the corrosion-protecting silicant precipitating out of traditional coolant.
I think I'm going to use 50% coolant and distilled water. For the coolant it's either Peak Final Charge NOAT ($28/gal undiluted) or Xerex G05 HOAT ($21/gal undiluted).
~ confused.
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12-04-2015, 02:33 PM
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#2
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Guru
Join Date: Jun 2008
Posts: 5,037
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Yes the Perkins is dry sleeved.
I always used Prestone (or equiv).
And still do in my Lehman.
__________________
Jay Leonard
Ex boats: 1983 40 Albin trunk cabin, 1978 Mainship 34 Model 1
New Port Richey, Fl
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12-04-2015, 03:01 PM
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#3
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Guru
City: Brookline, NH
Vessel Name: Shalloway
Vessel Model: Defever 44, twin Perkins
Join Date: Sep 2013
Posts: 2,260
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Quote:
Originally Posted by jleonard
I always used Prestone (or equiv).
And still do in my Lehman.
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Ditto. Standard Prestone in my Lehmans and its all they've ever had.
Ken
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12-04-2015, 03:18 PM
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#4
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Guru
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,149
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Quote:
Originally Posted by kchace
Ditto. Standard Prestone in my Lehmans and its all they've ever had.
Ken
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And recommended as OK by American Diesel...but the OP does have a Perkins....
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12-04-2015, 06:35 PM
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#5
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Guru
City: Cape Cod, MA
Vessel Name: Island Seeker
Vessel Model: Willard 36 Sedan
Join Date: Oct 2007
Posts: 1,306
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My lobsterboat has a 6.354 in it, vintage 1972, I have always used std. Prestone or other std. name brand AF and never had a cooling sytem problem . IMHO, fancy AF are for use in newer lightweight, highly stressed engines, not old all iron engines.
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12-04-2015, 06:47 PM
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#6
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Guru
City: Miami
Join Date: Jul 2013
Posts: 800
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You can use anything you find available which is rated astm d-6210. Don't use d-3306 as that's for gas engines.
Spell check via iPhone.
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Via iOS.
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12-04-2015, 08:26 PM
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#7
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Guru
City: Alabama
Vessel Name: Waypoint
Vessel Model: Californian 48' CPMY
Join Date: Dec 2013
Posts: 506
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Your engine was designed around the timeline of standard green (low silicate) antifreeze. You should also use some type of SCA (supplemental coolant additive) like Wix, DSM, etc to insure the proper ph of the coolant. Once you mix your antifreeze with distilled water you should test its ph. And it should be tested once it's installed and every few months of use and even non use. There are kits out there to test ph and are really cheap. You can opt for testing a sample just like oil. This will tell you lots about you coolant. Things like ph, Iorn and rust content plus it's cooling / boiling points which are good to know. I learned this the hard way with my recent rebuild of a CAT 3208TA.
Most of us have old Iorn in our rides. We really need to maintain and look at our cooling systems closely. Like I said I'm learning the hard way that just cause it looks ok does not mean it is OK!
__________________
Jon
------------------------------------------------
Waypoint's are abstract, often having no obvious relationship to any distinctive features of the real world.
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12-05-2015, 12:34 AM
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#8
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Guru
City: Pender Harbour, BC
Vessel Name: Gwaii Haanas
Vessel Model: Custom Aluminum 52
Join Date: Sep 2013
Posts: 3,791
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Capt. Jon, some good advice. Hope they listen to you...
__________________
Don't believe everything that you think.
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12-05-2015, 12:45 PM
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#9
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Senior Member
City: San Francisco
Vessel Name: Shellbourne
Vessel Model: 1978 Mainship 34 Perkins T6.354
Join Date: Dec 2014
Posts: 171
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What's "lorn"?
I saw somebody checking the voltage between the coolant and the negative battery terminal. Surprisingly it was .3 volts with old coolant. That tells me something galvanic is happening, but I wouldn't know if it's the protective effect of the zinc or bad corrosion happening. Seems like a good idea if there was a way tell which was happening.
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12-05-2015, 01:40 PM
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#10
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Guru
City: Alabama
Vessel Name: Waypoint
Vessel Model: Californian 48' CPMY
Join Date: Dec 2013
Posts: 506
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Quote:
Originally Posted by R_p_ryan
What's "lorn"?
I saw somebody checking the voltage between the coolant and the negative battery terminal. Surprisingly it was .3 volts with old coolant. That tells me something galvanic is happening, but I wouldn't know if it's the protective effect of the zinc or bad corrosion happening. Seems like a good idea if there was a way tell which was happening.
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Sure makes me think that the coolant is too acidic and turned into a battery solution. However I have to say that's above my pay grade. Sure makes you think though.
__________________
Jon
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Waypoint's are abstract, often having no obvious relationship to any distinctive features of the real world.
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12-05-2015, 05:28 PM
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#11
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Senior Member
City: San Francisco
Vessel Name: Shellbourne
Vessel Model: 1978 Mainship 34 Perkins T6.354
Join Date: Dec 2014
Posts: 171
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D6210 is OAT
More confused
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12-05-2015, 06:29 PM
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#12
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Guru
City: Sarasota/Ft. Lauderdale
Join Date: Apr 2014
Posts: 5,438
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Quote:
Originally Posted by Capt. Jon
Sure makes me think that the coolant is too acidic and turned into a battery solution. However I have to say that's above my pay grade. Sure makes you think though.
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A reading of under .5 or so volts means the coolant is good as I recall.
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12-05-2015, 07:08 PM
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#13
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Guru
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,149
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From an article I researched...
Caterpillar Engines
Summed up by Doug Hunsicker
Meter reading:
0 to .3 volt is normal in a coolant of a cast iron engine. .5 volts will destroy a cast iron engine with time and engine manufacturers are reporting .15 volts will damage an aluminum engine with time.
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12-06-2015, 02:10 PM
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#14
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Senior Member
City: San Francisco
Vessel Name: Shellbourne
Vessel Model: 1978 Mainship 34 Perkins T6.354
Join Date: Dec 2014
Posts: 171
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But which spec to use, 3306 or 6210? 3306 is old style coolant and is found everywhere. Every coolant at the parts store is 3306 and there was one jug of 6210 that was very expensive.
This is why I'm unsure. People say buy traditional and OAT, which is 6210...
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12-06-2015, 07:45 PM
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#15
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Guru
City: Venice Louisiana
Join Date: Dec 2013
Posts: 1,097
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What concerns me the most is assembling an engine cooling system without knowing the difference between wet and dry sleeves, or what it has. With dry sleeves plain old distilled water is fine, just add some Nalcool. Distilled water cools better anyway. With wet sleeves you should pay more attention.
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12-07-2015, 03:29 PM
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#16
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Senior Member
City: San Francisco
Vessel Name: Shellbourne
Vessel Model: 1978 Mainship 34 Perkins T6.354
Join Date: Dec 2014
Posts: 171
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Quote:
Originally Posted by kulas44
What concerns me the most is assembling an engine cooling system without knowing the difference between wet and dry sleeves, or what it has. With dry sleeves plain old distilled water is fine, just add some Nalcool. Distilled water cools better anyway. With wet sleeves you should pay more attention.
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Nalcool is HOAT.
So the forum has several votes for standard coolant (3306), one for OAT, and now one for HOAT.
Now I understand a recent article I read about different coolant types, tap water vs distilled and said none of it really matters as long as the coolant is tested periodically and the corrosion inhibitors are still active.
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