1990 Johnson Evinrude "ES" 40 thru 55, P/N 507872, Page 312Get this manual
22Install new motor a-ring1221 23Position the motor on the manifold and install the four screws and lockwashersTighten the screws to 35-52 inIbs(4-6 Nm)1231 24Oil and place the pump control piston in the manifold124 25Oil and install the components of the down check valve1251 26Torque the down check valve housing to 50-60 inIbs(6-7 Nm)