Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 73Get this manual

Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 73

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SERVICE MANUAL NUMBER 24
Avoid product damageDo not disturb the Y-fitting when removing the drain plugThere is an ignition control "Knock Sensor" in the upper hole of the fittingThis sensor must