1969 Evinrude 40 HP Big Twin, Lark Service Repair Manual P/N 4596, Page 44Get this manual
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C LIN ER AD
WAT ER VE 14 EX AUST WAT _145 OR LESS
WATER VER _145 EXHAUST TUB WA TER PUMP WA _ -1 45 SS TU RNS TO PUMP
Figure 5-3ACooling SystemManual Shift 5-3