I have a new 4HP Mercury outboard. I want to flush the cooling with fresh water. I see the packet came with the adapter to screw into the motor but.. Has anyone figured out how to use it? It is really small for adding a plastic tube big enough to move water through it. Any other suggestions of what I can use?
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hikencree
I have a 32 gallon (I think - It might be the 44 gallon one though) Brute trash barrel. I fill it part way with fresh water from the hose (probably 8 gallons or so) and then hang my outboard motor so that the intake is below the water line. I start the motor, and put it in gear. After I run it for a few minutes, I fog the carburetor, pull the plug and fog the cylinder. Then, I replace the sparkplug but do not reconnect the sparkplug wire. I then drain the carb. I do all of this while the motor is hung on the barrel. If I had a four stroke I would then drain the engine oil while the outboard was on the barrel too. I then take the motor off of the barrel and change the lower unit oil. I hang the outboard on piece of wood in a vice in my garage for the lower unit oil change. Finally, before I put everything away, I dump the water out of the barrel.
What eherily said. I use a 5 gallon bucket and a DIY motor stand. Key is having the bottom leg deep enough into the water.
For a small outboard that can be easily lifted, I’d do it exactly as described by E. If you can’t, you can purchase a device that grips around the outside of the lower leg, over the water intake. They look like rubber ear muffs. You connect a hose to it and it provides cooling/lubricating/flushing water, plus it permits you to warm the oil, out of the water, to change it.
If you‘re not storing the outboard in a heated place, I’d run some antifreeze through that same device. Outboards are technically supposed to drain, but I have to think some water gets trapped.
If you‘re not storing the outboard in a heated place, I’d run some antifreeze through that same device. Outboards are technically supposed to drain, but I have to think some water gets trapped.
HI,
Step one is to make or buy an engine stand. I made one out of some scrap 2 X 4. I see there are cheap ones for sale on Amazon. One the outboard is mounted on the stand I basically follow the instructions listed above. I don't drain the carb, instead I add fuel stabilizer to some fuel, I run the engine for a few minutes, then I turn off the fuel flow and run the carb dry.
Good luck,
Barry
Step one is to make or buy an engine stand. I made one out of some scrap 2 X 4. I see there are cheap ones for sale on Amazon. One the outboard is mounted on the stand I basically follow the instructions listed above. I don't drain the carb, instead I add fuel stabilizer to some fuel, I run the engine for a few minutes, then I turn off the fuel flow and run the carb dry.
Good luck,
Barry
In the cold of the Great Lakes I don’t worry about flushing salt water.
At the end of the season I start the motor, pull the fuel line, and run the carb as dry as possible. Then put it on a motor stand for six months.
This is what I’ve done with the Merc 15 for 20 years, and the Johnson 9.5 for the prior 25 years.
At the end of the season I start the motor, pull the fuel line, and run the carb as dry as possible. Then put it on a motor stand for six months.
This is what I’ve done with the Merc 15 for 20 years, and the Johnson 9.5 for the prior 25 years.
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