1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 18Get this manual

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Figure 3 Manifold Drain Plug MerCruiser 80
WAR ING: Do not operate ef,vine without cooling wat lowing through wat pumpor water pump will be damagedI Run ngi ne sufficien tl bring it up to norma!

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