1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 859Get this manual
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CLOSED COOLING SYSTEMWATER FLOW
IM and MIE
1 Sea Pump :2 ransmission Oi Coo lerHeat Exchanger Exhaust lbow Wilter ese rVOir Cir cu lat ng Pump Engine Block and Heads Thermost at Hou