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  E-TEC 90 Flushing Without Running Engine

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Author Topic:   E-TEC 90 Flushing Without Running Engine
Quogue posted 09-29-2014 10:14 AM ET (US)   Profile for Quogue   Send Email to Quogue  
[Evinrude] says you can flush the [E-TEC 90-HP] engine without even starting it. I noticed that the water all comes out of the engine on the lower end, running or not. I saw a [recording in which] someone was using muffs [i.e., a hose adaptor] to flush an E-TEC and the water came out of the [cooling system overboard stream or confidence indicator]. Do both methods do the same job? Or do you have to use muffs to actually get water though the heads and specifically the thermostats, which can hold enough salt to fill a salt shaker if not rinsed properly.
jimh posted 09-29-2014 01:21 PM ET (US)     Profile for jimh  Send Email to jimh     
If you want cooling water to pass through the thermostat regulators in the cooling system of your Evinrude E-TEC outboard engine, you must operate the engine until the engine cooling water temperature rises enough to open the thermostat valve.

The Evinrude E-TEC service manual will show the cooling water system flow, and from study of the diagram you may be able to deduce the exact difference between introduction of the cooling water when the engine is not running at the two places you inquire about.

You should be aware that the Evinrude E-TEC 90 does not have the usual cooling system overboard indicator stream that passes through a nozzle or orifice as seen on many outboard engines.

You should study the cooling system flow diagram in the service manual. It shows that the cooling system overboard flow comes out of the port that is used as the flushing adaptor port. The water that flows from there is coming from a branch of the cooling system that passes through the fuel-vapor separator cooling coil and through the engine management module (EMM) cooling line, coming from a port on the top of the engine block.

When water is back fed up that outlet, it passes through the fuel cooler, through the EMM cooler, back to the block, and eventually down to the water pump, through the non-moving impeller, and out the water inlet ports on the gear case.

If you use a hose adaptor and ear muffs on the gear case and do not run the engine, the cooling water would flow in the same path, but the direction would be reversed--at least that is what I see from studying the diagram. I encourage you to study the diagram and see if you reach the same conclusion.

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