How do you test a temperature sensor on an outboard motor?
Connect the “S” terminal to the “G” terminal with a jumper wire with alligator clips on each end. The gauge should read above 240 degrees. The gauge is working fine if it passes these tests. Therefore, the problem is with the temperature sender.
How do I know if my outboard is overheating?
One of the best ways to tell if your outboard motor is overheating is by checking the dash gauge. You just have to look at the dash gauge for the temperature. If it is green, then you don’t have to worry about anything but if it goes from green to red, then it is an indication that your boat is overheating.
What happens if an outboard overheats?
The cooling system keeps the oil temperature down so the oil can lubricate the internal parts of the engine. Overheating ruins the lubrication and the metals parts start melting and sticking together. Or they just break apart with a big bang.
How do you check a temperature sensor on a Yamaha outboard?
There is a overheat temperature sensor on the top of each cylinder bank. With engine off and key on, unplug the two wires between the harness and the sensor, then connect the two harness ends together. The alarm should sound; repeat on the other bank.
What happens when 2 stroke outboard overheats?
When a 2-stroke engine is overheating, something within the system is in a bind. It may be physical bind such as gears grinding from inadequate lubrication or something less tangible like a clogged air filter. But something is causing the engine to run harder than it is designed to run.
Should water coming out of outboard be hot?
Your water flow should appear steady in most outboards. You also want the water coming out to be warm, but not excessively hot.
Why would an outboard motor overheat?
The most common cause of outboard motor overheating is water pump failure. Lack of raw water flow and lack of fresh water can cause water pump failure. Check for lack of raw water flow by noting the temperature of the outlet side of the system.
Can an overheated outboard be fixed?
With either the outboard or inboard installation, after a severe overheat, the thermostat should be replaced as they are quite frequently damaged during an overheat event. Once you get all the missing pieces out of the cooling system and replace the thermostat, you should be OK.
