1998 Johnson Evinrude "EC" 25, 35 HP 3-Cylinder Outboards Service Repair Manual P/N 520205, Page 282Get this manual
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18828 22 Install
26 Tighten the down check valve housing to 50-60 inIbs(6-7 Nm)27 Oil and install and components of the up check valve
28 Tighten the up check valve housing to 50-60