Yanmar Service Bulletin – coolant & fuel bleeding

Winter always brings a small amount of anxiety for boat owners, get your winterization wrong and you’ve created expensive problems. Fresh water systems get a dousing of pinnk antifreeze, but engines seem to cause confusion. Given that engines are made up of many materials with different properties, such as rubber gaskets, aluminum, brass and steel,  coolant additives are important to ensure parts aren’t being corroded by the very liquids designed to protect them. Here is a list of coolants from Mack Boring regarding Yanmar engines.

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-Freeze.
  • 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.

Full text can be found in this Yanmar service_bulletin: fuel bleeding & coolant

Here is another great link on Yanmar engines: http://nsc.ca/nsc_library/techtalk/dewitte_diesel.htm

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