How to flush outboard motor cooling system

This fitting can be found on the motor facing the boat beneath. Be sure the engine is receiving cooling water by checking the overboard indicator.

Re-install thermostat and impeller.

How to flush outboard motor cooling system. In old times flush muffs were used to flush outboard motor cooling systems as they are cheap. All you need to do is connect a garden hose fit muffs on gear case and turn on the water. However a lot of factors have to be taken care of eg.

No additional water intake should be carried out as it leads to overheating. So the end result is if youre looking to flush an outboard after every trip use either fresh water or put a bit of salt away in it. And if youre looking to restore an outboard that is really corroded up over time.

Id recommend the acid but just be careful. 3 Ways to Flush an Outboard Motor. There are few ways to flush an outboard motor and lets check them out.

Most outboards made in the last 10 to 15 years feature a built-in flush connection that connects the motor to a garden hose via a snap fitting adapter or a threaded fitting. This fitting can be found on the motor facing the boat beneath. You can flush the cooling system with fresh water using a garden hose just as you do when you winterize the outboard.

But some parts require a different approach. One example is the jets and passages in a carburetor which are small some verging on invisible. My 115 Honda has a removable cap that allows you to put water through the engine cooling system to flush it when on a mooring.

YOU MUST NOT RUN THE ENGINE THO. I always flush mine but when i did my RYA course the 150 honda on the training rib had never been flushed and was 6 years old with no corrosion probs. Turn engine on to allow fresh mixture to flow through system then shut off engine again.

Dispose of flush mixture in compliance with local state and federal laws. Fill container with fresh water and completely submerge engine intakes in water. Start engine once more and run for 5 minutes while fresh water runs throughout the engine system.

Outboard engine cooling systems. How to replace the impeller Start by disconnecting the gearbox linkage. Remove the round plastic disc two-thirds of the way down the leg to reveal the clamp that joins the two sections of the control rods you may need to engage reverse gear for the clamp to become visible.

Add Engine Flush to engine oil prior to oil change through the oil Fill point. Re-start engine let the engine run for 10 minutes. Allow engine to cool then drain engine oil.

Sounds like it might be worth doing to my poor old neglected tender outboard. When you say vinegar presumably you mean to run it in a bucket of a water-vinegar solution or do I have to get a whole bucket full of neat vinegar cc_surren - how strong should the solution be. Plug the hose in turn the water on.

Wait till you have a good water flow then start the outboard engine and check that the water is flowing through the cooling system by having a look at the outlet. After two or three minutes turn the engine off. Turn the hose off.

Remove the earmuffs and the engine has been flushed with fresh water. Put 40-60mls of Salt-Away concentrate into mixer cup for under 90hp motors or for 90-300hp use 80-100mls to flush your engine wash boat trailer and fishing gear. Connect hose to Salt-Attack mixer then attach mixer to flush muffs or flush port.

Be sure the engine is receiving cooling water by checking the overboard indicator. If your outboard has more than one set of cooling inlets a flush bag should be used. Engine should not be running.

It can be tilted or vertical. Flushing or backflushing a outboard for clear water passage. Run compressed air or the garden hose up the water line ensuring it exits at the t stat housing then back down ensuring it exits via the water line.

Also be sure that the water intake area is free of debris. Once youve established the motor has a port and youve found it the rest is easy. Connect a garden hose to the port.

Turn on the water. Let the engine flush for five to ten minutes. Unlike the alternative method discussed below theres no need to turn the engine on when using a flushing port - theyre designed to be used without power making them a lot quieter.

Thread the garden house into the engines flushing port. Turn the water supply on. Flush the outboard engine for no less than 5 minutes.

Turn off water supply and remove the hose from the engines flushing port. Lastly place the outboard in the down position to allow the engine block to drain completely. In this episode of the Fantastic Fishing Show we reverse flush our outboard engine and show you how to use flush muffsIt is important to flush your engine a.

Every time you bring your boat in you should flush your Mercury outboard with fresh clean water to remove aquatic plants mud silt and salt from the cooling system. You cant always flush your motor before leaving the boat landing but you can always flush it in your driveway. The flushing process can be completed in just a few minutes doesnt.

All you have to do is lower your engine to the vertical position hook up a hose to the conveniently located flush connector and let the water run for 10 minutes you dont even have to start your engine. By the time youve unloaded your tackle and cooler your engine is flushed clean and ready to put away until your next outing. Drain the coolant and flush with tap water dispose of the coolant safely Fill the cooling system with about two cups of liquid dishwasher detergent dissolved in hot water.

Start the engine and run it until it warms up to regular operating temperature. Drain the detergent solution and flush with tap water again until it runs clean. Flush the outboard motor with fresh water for 5 minutes.

Then dispose of flushing water and repeat the clean water flush process again for a further 5 minutes. Remove flushing system from outboard motor. Re-install thermostat and impeller.

The outboard motor flushing descaling process is complete. An Outboard Cooling System. As gasoline is burned in an outboard motor the temperature quickly rises in and around the piston and cylinder.

The chemical energy of the fuel is changed to the energy of motion of the piston as well as heat and sound energy. Today I tackled acid flushing the raw water cooling side of my engine. I had disassembled cleaned greased and reassembled the air cooler about a year ago but now it seemed time to do the entire system.

In the summer at a cruising rpm of 2800 the engine temp runs about 190 and rapidly increases to 200 or so at wot.