Evinrude E-NATION, for those dedicated to water, power, fishing and fun
Posts: 1
Registered: ‎10-02-2012

Running outboard out of the water

We use our outboard on our rescue boat on board a ship in the Gulf of Mexico. As part of our regular maintenance we run the outboard every week while it's out of the water. Can we safely do this by using a hose hooked up to the lower engine cover flushing port? Or is it necessary to submerge the lower unit in a barrel of water?
Posts: 77
Registered: ‎07-22-2011

Re: Running outboard out of the water

Yes, the flushing port can be used to run the engine. Water pressure should be limited to 20psi max, and the engine should not be run at more than a fast idle, say ~1000 rpm.



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Posts: 0
Registered: ‎08-28-2018

Re: Running outboard out of the water

I have the same situation here at work. We have to run our Rescue Boat engines for 6 min each week. The boat only gets run in the water about once every 3 months.


We just received twin brand new 75 HP evinrude E-Techs 2 strokes. We previously would run our engines with rabbit ears. Now the new engines have the flushing port, and we got the quick connect couplings for this. 


Is it better to run the engine with the flush or the rabbit ears? My concern with runing the engine with only the flush weekly is that the water pump isn't sucking through the water intake on the lower unit and pumping out through the "pee hole" as designed. Eventually damaging the water pump possibly??


In the user manual it says "it is NOT necessary to run the engine for a good flushing" through the flushing port. So I feel like they kind of discourage it. 


Then in the user manual it talks about flushing with the Gearcase Flushing device which would be the "rabbit ears." It sasy to take off the propeller for this, I'm assuming they only mention this as a safety pre-caution, but we dont put the boat in gear when we run it on deck and taking the propellers off every week would be impractle. 


Any advice on this? 



Posts: 22
Registered: ‎10-22-2012

Re: Running outboard out of the water

Only downside I see to using the flushing device is that the motor may not reach full operating temperature.

On the plus side you don't have to worry about the muffs slipping, & sucking air into the waterpump.