Antifreeze in Yanmar - SailNet Community
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post #1 of 3 Old 07-03-2010 Thread Starter
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Antifreeze in Yanmar

The antifreeze solution in Yanmar might change to gell form and cause cooling problems. This might be specific to Turkey only but it is a good idea to check your cooling system. If the colour of the fluid is green, make sur you replace all cooling fluid with another antifreeze solution.
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post #2 of 3 Old 07-18-2010
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Yanmar recommended coolant - NOT GREEN !

check the yanmar service bulletins. yanmar is no longer recommending the 'green' engine antifreeze', only the 'pink' engine long-life antifreeze. (don't confuse this with the pink potable freshwater system antifreeze for your drinking water system..)

Excerpts from Service bulletin re: Coolants:
Mack Boring & Parts Company Headquarters: 2365 RT.22 Union, NJ 07083
PH 908-964-8475, FAX 908-964-8475, WEB• Improved water pump life due to reduced water pump seal wear resulting from fewer abrasive
dissolved solids.
• Reduces hard water scale.
• Offers excellent protection against pitting corrosion caused by cylinder liner cavitation. Better
heat transfer than conventional coolants with regular SCALE additions.
• No silicate gel formation during use or storage.
• Outstanding hot surface aluminum protection.
• Superior protection in high operating temperature conditions.
• Effective, long-term corrosion protection for aluminum, brass, cast iron, steel, solder and
copper alloys.

The coolant/anti-freezes that have been tested and approved are shown below:
• Texaco Long Life Coolant Anti-Freeze both regular and pre-mixed Product codes 7991 and
7998. This product is available in gallon containers, drums and bulk. It is recommended that the
cooling system be drained and flushed before filling. Only Texaco Long Life Coolant should be
used for top-off. This product has a much longer shelf life than conventional coolants provided
the integrity of the container is maintained. For additional information and availability contact
Texaco at 1-800-782-7852.
• Havoline Extended Life Anti-Freeze/Coolant. Product code 7994. This product is available
through Texaco gas stations, Procedures are the same as with Texaco Long Life Coolant Anti-
• Dex-Cool Long Life Coolant. This product is available through GM service centers worldwide.
• Prestone Extended Life Coolant. Product code AF888. If the above coolants are not readily
available, Prestone Extended life coolant is satisfactory.
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post #3 of 3 Old 07-19-2010
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Originally Posted by celenoglu View Post
The antifreeze solution in Yanmar might change to gell form and cause cooling problems. This might be specific to Turkey only but it is a good idea to check your cooling system. If the colour of the fluid is green, make sur you replace all cooling fluid with another antifreeze solution.
I had a new Yanmar 4JH4AE put in my boat in the EU. It was difficult to get the recomended (by Yanmar) long life pink coolant. I eventually managaged to get some and it is nice to use the best product for the job, but 99% of Yanmar engines in the EU seem to use the standard green coolant.
AS I understand it the gelling problems occur when the coolant type is changed with some reports that once you have used a green based coolant in an engine you cannot change to the recomended pink solution even with steps to flush out the old coolant.
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