Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 111Get this manual

Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 111

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SERVICE MANUAL NUMBER 24
Insufficient Water Flow from Belt Driven Seawater Pickup Pump
Cause Drive belt Seawater shutoff valve partially or fully closed Clogged or improperly installed sea