The water comes into the outboard’s engine through the lower unit, which is below water level as the boat is moving. Without a pump of some kind, water couldn’t flow up to the engine. The water pump is the heart of the cooling system.
Where should water come out on an outboard motor?
The cooling system on an outboard is a very simple and compact application. Water is inducted through the lower unit by a water pump impeller, and then forced upward to circulate throughout the powerhead, and eventually exits through the exhaust system.
Do all outboards have a pee hole?
Most outboards have the “pee” indicator which is to let you know that they are being cooled. Sometimes debris gets caught in the tube. Take a 1/64 inch drill bit and hand turn it inside of the hole while the engine is running.
Why is there no water coming out of my outboard motor?
The water pump impeller is the cause of most water circulation and overheating problems. The impeller is essentially a small, round disc with spinning blades used to move water through the circuit of the outboard motor. When the impeller is broken, it stops the supply of water to the engine and results in overheating.
How does water flow through a boat motor?
In a raw water system the water is drawn up through the seacock by the water pump. The water flows through the engine and directly out the exhaust. This cooler water absorbs heat from the engine to help keep it cool. Most newer marine engines use an enclosed cooling system.
How much water should be coming out of outboard?
Re: How much coolant water should be comming out of my outboard? Usually the cooling water pisses out of a small hole under the power head. There should be a hols approx 3 mm diameter facing down and a bit out. Normally a continuous flow expected, unless mercs are totally different.
How long can you run an outboard motor out of water?
If you’re flushing the motor, most manufacturers recommend running it for 5 to 10 minutes. If you’re running the engine for another purpose, such as to test its function, run it for as long as your maintenance task requires. Don’t run the engine unattended.
How do I know if my outboard motor is seized?
If you can’t turn the motor with a bar – then it’s seized. You’re right, plenty of times you’ll see an engine overheat and it will still run, but your overheat must have been worse than it seemed.
How do you unclog a pee hole on an outboard motor?
clear the pee hole
Clearing the water intake is easy: trim up the motor, inspect the intake and remove any debris fouling its operation. Running through thick grass is virtually a guaranteed method to clog the water intake on your lower unit. The clog you see above is easily wiped away with your hand.
Why does my outboard motor smoke?
Boat motors, especially two-strokes, commonly smoke because of an improper fuel to oil ratio or when the motor runs rich on fuel. When this happens, excessive blue-tinged smoke will come out the exhaust port, indicating too much oil is burning directly in the combustion chamber.
What happens if you start an outboard out of water?
You can run an outboard for a very short time out of water, but the impeller is running dry and will shred very rapidly.
Should water come out of exhaust on outboard?
It’s normal for cooling water to also exit through the exhaust. It’s part of the cooling system (in addition to the pee stream). And when you aren’t moving, the exhaust might bubble out from the lower unit because it also exits out through the prop while underway.
How do I know if my boat water pump is bad?
How to Tell if a Water Pump is Bad
- The outboard motor is overheating.
- The impeller is living on borrowed time.
- There is a reduced stream of water from the cooling water outlet.
What is a closed cooling system on a boat?
Marine Closed “Freshwater” Cooling Systems
Unlike in a car where the antifreeze/water circulates through an air-cooled radiator, a closed cooling system uses lake or ocean water flowing through a heat exchanger to remove heat from the engines cooling water/antifreeze mixture.
How do you know if your outboard is pumping water?
On many outboards, you can simply put on the muffs and start the engine. You should see a steady stream of water coming out of the holes on the top of the engine. However, some brands do pump out a stream, but it might not look steady. While this can be alarming, it is perfectly normal for those models.