Home › Forum › Ask A Member › Mercury 100 hp 4 cyl warning beep › Re: Mercury 100 hp 4 cyl warning beep
Sorry, 🙂 I was thinking about a V6 motor vs. yours, so disregard what I said about the larger tank inside the boat. Your engine has only one tank, that’s mounted to the powerhead. It will be nearly impossible to get to the float sensor, since it’s all the way at the bottom of the tank . Sorry for the confusion… i will edit my earlier post.
You will need to do a test of the float switch. Look on the bottom side of the oil tank. Find the two wires that are coming from the float switch, inside the tank. Unplug those wires. If the beeping stops, the float switch is defective. The reason for the float switch failure, in most cases, is a defective oil injection check valve. If the check valve sticks, it will allow fuel to gradually migrate up into the oil resevoir. This attacks the float, and causes it to sink. Thus, a steady oil injection warning. I’ll bet that’s what you will find wrong. As I said before, be sure you replace the check valve, located on the other side of the motor.
If you do find a defective float switch, you will need to order a complete oil tank assembly, since the switch is not serviceable. See a Mercury dealer.