Flushing a boat motor by running it out of water is a routine maintenance task. Running the engine without a water source for any length of time will cause damage, so you’ll need to attach a hose to the motor’s water intakes. If your motor doesn’t, you’ll need a set of motor flusher muffs.Click to see full answer. Correspondingly, is it okay to start a boat motor out of water?As it turns out, you can safely start your boat engine while out of the water as long as you have a properly connected water supply, like a garden hose attached to the water intake vent.One may also ask, how do you run a MerCruiser out of water? How to Start a MerCruiser Engine out of Water Attach the outdrive muffs to a garden hose. Place the muffs over the vents in the outdrive. There are two vents on each side. Turn the water source on. Allow the air pockets to work their way through the muffs. Allow the water to flow through the muffs into the outdrive for 10 seconds before starting the motor. Hereof, is it bad to run an outboard without water? You can run an outboard for a very short time out of water, but the impeller is running dry and will shred very rapidly.How long can you run outboard on muffs?A set of “ear muffs” or “flush muffs” was fitted around the engine’s gearcase to cover the water intakes, connected to a garden hose with a good water supply, and the engine was run for five to 10 minutes. But today’s outboards can be flushed using other, sometimes easier methods, without even starting the engine.
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