Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 21Get this manual
Flushing Engine After operation in salt water poll uted water, install Quicksilver Flushing Attach ment to flush the engine, following
8If engine wi ll be exposed to freezing temperatures, using starter motor, crank engine over (2 revolutions) to clear any remaining water from water pump
.a.WARNING
When flushing, be certain that area In vicinity of peller Is clear and that no person Is standing nearby-to avoid possible InjuryIt Is recommended to remove propeller as precautionary measure