Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 54Get this manual

Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 54

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MAINTENANCE
If boat is in the water, seacock, if so equipped, must remain closed until engine is to be re-started, to prevent water from flowing back into cooling system andor boatIf boat is not