What causes a Mercury boat motor to overheat?
The most common cause of outboard motor overheating is water pump failure. Water pump failure can also be caused by a defective heat exchanger, though this is harder to check. Generally, if it is not a problem with lack of raw water flow or fresh water, the heat exchanger will be the cause.
How do you fix a overheated outboard motor?
What To Do If Your Boat Overheats
- -Check For Blockage. If you know where your raw water strainer is, check and see if it’s plugged.
- -Check The Coolant. There are times when your cooling system needs some work, but isn’t in complete failure.
- -Lighten The Load.
- -Air It Out.
- -If All Else Fails, Call For A Tow.
Is the motor on my Mercury outboard overheating?
Also, it doesn’t seem as though the motor is actually overheating since the water “peeing” out is only lukewarm. I leave the dock and have to cruise along for awhile at under 6mph in a no-wake zone. The water pressure is about 3.5 psi.
What causes an outboard motor to overheat in salt water?
Although this is most common in salt water, it is still a possibility and cause of overheating. Rust and corrosion accumulate and clog the water passages. You can check this by touching the risers when the engine is running. If it is noticeably warm to the touch, this is a sign it is clogged.
Is the water pump on my Merc overheating?
Merc 2003 150 saltwater carburated V6. I put a new water pump and new stats and it runs great on the hose but overheats in the water. I haven’t checked the popet valve yet but i will as soon as I get off duty wendnesday and i’ll post results.
Why does the Poppit valve not work on a Mercury outboard?
The cooling system on the newer engines uses volume not pressure due to floppy vane water pump thus the lower water pressures on guages. The poppit valve is a pressure relief valve and does not come into operation untill block pressure overcomes the spring.
Also, it doesn’t seem as though the motor is actually overheating since the water “peeing” out is only lukewarm. I leave the dock and have to cruise along for awhile at under 6mph in a no-wake zone. The water pressure is about 3.5 psi.
Why does my Evinrude Outboard keep overheating?
The discharge indicates that water is being pumped through the cooling system. If there isn’t a discharge, stop the engine and clean the water pump indicator. Drop the engine back in the water and try again. Turn off the motor and tilt the outboard again if you continue to have overheating issues.
Why is my Mercury outboard engine not starting?
Air vent in fuel cap not open. Faulty emergency kill switch. Some engines — not the pull-start kind — have a battery that starts it. If your engine has a battery, make sure it is charged up before use; verify the battery connections are clean — as corroded connections can keep a Mercury outboard from starting.
Although this is most common in salt water, it is still a possibility and cause of overheating. Rust and corrosion accumulate and clog the water passages. You can check this by touching the risers when the engine is running. If it is noticeably warm to the touch, this is a sign it is clogged.