1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, P/N 507875, Page 206Get this manual
[jJ Water Control Valve
Servicing
f1l 1The control valve can be serviced as an assembly, or the wiper and seal can be serviced individuallyf21 2To service the valve, disassemble and discard the wiper and seal
Lightly oil new seal and place it on the valve
L!J facing
f41 4Place the new wiper on the valve with the wiper lip the valve housing