antifreeze for diesel engines - SailNet Community
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post #1 of 51 Old 01-14-2019 Thread Starter
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antifreeze for diesel engines

Was reading the manual (always dangerous) on our little Westerbeke 35b and it says to use antifreeze specifically made for diesel engines. Have to admit I thought antifreeze was antifreeze and either greed on red. Has anyone found it really makes a difference?

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post #2 of 51 Old 01-14-2019
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Re: antifreeze for diesel engines

Good one dadio917 , I had never heard of it . Now I have to read this article .

https://www.underhoodservice.com/vid...l-or-abnormal/

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Re: antifreeze for diesel engines

most important is to not mix the different types. there are more than two types and colors and most are spec-ed for the metals in the system that they are to protect.

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post #4 of 51 Old 01-14-2019
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Re: antifreeze for diesel engines

Vibration can cause cavitation in diesel cylinder cooling passages. Diesel anti-freeze has additives to reduce this.

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Re: antifreeze for diesel engines

Geoff - interesting. Any recommendations? ours is green.

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post #6 of 51 Old 01-14-2019
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Re: antifreeze for diesel engines

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Originally Posted by dadio917 View Post
Geoff - interesting. Any recommendations? ours is green.
Not really, sorry! I use Zerex GO5 because it is easily available from autoparts stores and was the factory coolant for diesels for a couple of major automakers. It is orange. Cummins and Detroit coolants are suppose to be good - that sounds reasonable but I have no actual knowledge. If you want to change, flush thoroughly first.

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Re: antifreeze for diesel engines

Google "diesel liner pitting." you will find many references. In dead, this problem is unique to diesels.



The problem is that under sustained high load, piston slap causes cavitation on the outside of the cylinder liner, which can lead to holes in severe cases. This can be controled with several chemistries, the most common being either nitrite/moly or high concentrations of OAT.

G05, in fact, is a good choice. Or you can just shop from the diesel engine manufacturers.

[In a former life I sat on the ASTM committee that developed the standards, and developed additives for diesels, which we tested using ultra sound. A long story and I am retired from it.]

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Re: antifreeze for diesel engines

This is on a tangent but still related to anti-freeze for diesel engines. A boat I know of failed the survey because the owners thought you were supposed to put anti-freeze in the fuel tank then run the diesel to make sure it was winterized. Scrap one diesel. Also ended up scrapping the entire boat. Had to call a salvage company to remove it from the marina.
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Practical Sailor did a good review of coolant for diesel engines a couple of years ago. I can't remember the brand that was considered "best," but I bought 4 gallons of it from my local Caterpillar dealer. I was surprised to find that the marina that I kept my boat in had the same brand on the shelf.


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Re: antifreeze for diesel engines

IMHO if you are servicing a Yanmar then every part or fluid container used should say 'Yanmar'

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