1991 Johnson Evinrude EI 60 Loop V Models 150, 175 outboards Service Manual, Page 32Get this manual
Special Operating Conditions Salt Water
Fresh water internal flushing is recommended after use in salt, polluted, or brackish water to prevent deposits from clogging the cooling passages Remove water pump indicator plug Attach water hoseTurn on water to begin flushingMotor can be stopped or running at idle while flushingDo not flush engine with water system that exceeds 45 psiDuring long periods of non-use, tilt motor so that the gearcase is out of the water, unless the temperature is below 32 (0 C)When removing motor from water, allow cooling system to drain completely by placing motor in normal (vertical) position
Weedy Water Weeds can block the water intakes and cause engine to overheatWeeds on the propeller will cause motor to vibrateRun at slow speeds and reverse motor frequently to clear weeds from propellerCheck water pump indicator oftenRemove weeds from propeller and water intakes before operating in clear waterFreezing Weather To avoid motor damage, keep the gearcase submerged in the water at all timesBefore operating in freezing temperatures, check gearcase lubricantIf leakage is found, gearcase seals will need serviceWhen removing motor from water, keep motor in normal (vertical) position until the cooling system is completely drained