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Mend Yanmar 20GM Help System Cleaning

Help Yanmar 20gm cooling system blocked?

Is there any type of cleaning agent that can clean the insides of the engine block of a saltwater cooling system on a yanmar 20GM version.The engine is now over 10yrs old. If not what are my options.

Thanks

Nigel
March 2009
YanmarYanmar 20GMBoats, YachtsHelp System Cleaning

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Yanmar 20GM Cooling System Blockage - Help