Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 763Get this manual

Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 763

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CLOSED COOLED MODELS
Closed Cooling Section
Closed cooling section of closed cooling system should be cleaned at least once every two years or whenever decreased cooling efficiency is expe