Honda Marine Outboard Motors

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Honda Marine Outboards How-To's

Flushing Outboard Engine

How to Properly Flush a Honda Marine Outboards (Video)

How to flush Honda Outboards, brought to you by Fishing World and Honda Outboard Engines. ... read more

Video Transcript

So here we are. We spent a day in salt water with our boab boat. It’s important now, to wash all the salt from the exterior of the boat, and the exterior of the engine. But more importantly, what we need to do is flush the cooling system.

The reason we flush the cooling system is that, modern day outboard engines, and outboard engines in general, draw water from the lake, from the sea. And circulate that water around the power head, out through the cooling chambers, and use that water to cool down the engine. So it’s important now, that we’ve stopped the boat, to wash out that salt water. Because over time, that salt would crystalize the, and can start blocking cooling system passages.

The way in which we do that. I will just put this hose down. We use a flushing attachment, and this is called a set of ear muffs or rabbit ears. And we grab this flushing attachment; we put this flushing attachment over the inlet at the bottom of the engine, at the bottom of the outboard casing. So we put this over, and make sure that it’s nice and secure, and that it fits completely over the engine, water intake at the bottom here.

We then grab our hose. This hose is pressurized, so I just take it over quickly. Grab the hose, attach the hose to the flushing attachment, and make sure that we’re getting clean water flow over that inlet. So now we are ready to flush your outboard. We have water to the engine, topping the boat, normally keep the engine over, but I get my trusted assistant to give the engine a quick start. So now the engine’s running. It’s important to ensure that there’s water flow from the engine. We do that by looking at this tell tail. Which the indicator water is now straining through the cooling system. This is fresh water, and it is now flushing our engine. Normally flush the engine for 10, 15 minutes maybe a bit longer.

You have to ensure that the thermostat is fully opened, the engine gets to operating temperature. So with that a maximum water flow is circulating through that cooling system, to circulate through all of those little patches and chambers. Flush out the salt water, and salt crystals. Don’t leave your boat unattended whilst you’re doing this, because if the flushing attachment comes loose. Then you won’t have cooing your engine. Your engine could overheat, and potentially do some serious damage. So that’s the basic of flushing engine. It’s important to do that, after every trip in salt water.

Also in fresh water, especially if you’ve been through some mud, or sand, and there maybe some silt, through the cooling system. So I’ll just switch the engine off quickly now. We’re going through some other flushing points, on the other side of the engine. And we’ll briefly wrap up the flushing process. Sometimes it’s not practical, or viable to run your engine. So if you’re coming from a fishing trip late at night, or in the morning, you can’t always run your engine. And some of these modern day air boat motors have a secondary flushing attachment, or a flushing port. Like on this engine, we have on up here. This is not as efficient, as drawing the water through your cooling system, cause you’re not getting your thermostat open, and your thermostat working. However, this is a good second alternative, if you can’t run your engine. So we usually grab the hose, and you just connect the hose to this flushing attachment, run the hose. And allow the water pressure to circulate water through the cooling system.

A good alternative if you can’t run your engine at night. Also on some of these smaller engine, now they have a smaller 3:54. They sometimes have tricky little flushing inlet cords. What you can do, if you can’t get a set of ear muffs. You just stick them in a large bin, or a bucket, or even a canvas flush bag, fill the bucket up with water, lower the engine into the water, start the engine .And it will draw water through the cooling system, so you can have the water through the cooling system appropriately. So that’s an introduction to flushing your engine. It’s important to do so after, every trip in salt water, and I’d do after every trip in fresh water as well, just to get into a pattern, into a routine. Ensure that your cooling system is flushed. You don’t have salt crystals or grit in your cooling system. And hopefully ensure smooth running of your outboard for a long time.
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