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Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3342
Experience:  US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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I have a 95 200hp mercury xri that i get a continuous beep

Customer Question

I have a 95 200hp mercury xri that i get a continuous beep beep beep that I believe is the overheat alarm I rebuilt the water pump, checked the thermostats, and also replaced the poppet valve (there was water coming out of the weep hole). I ran the boat on muffs at the house and everything checked out besides the water being a little warm coming from the tell tale. went to the lake and ran about a mile and the overheat alarm came back on, gauge read 160 so i got a tow back to the dock and brought it home. I've taken the lower end off and run a garden hose to the water intake to make sure water runs through the block and there isn't any obstruction. Now when I start the boat there is a continuos overheat alarm even after sitting overnight in the garage. The water from the tell tale at idle is off and on and very warm.
Submitted: 1 year ago.
Category: Boat
Expert:  Charles replied 1 year ago.
Hello, My name is***** will be assisting you today. This alarm is a beeeping tone and not a solid tone? Is that correct?
Customer: replied 1 year ago.
yes, It was a continuous beep but now it is a fast beeping tone, after looking at the oil reservoir on the motor i think i need to bleed the air out of the system it is a little low
Expert:  Charles replied 1 year ago.
The beeping alarm is for a few things. the oil tank is one of them. Do you now how to bleed the system?
Customer: replied 1 year ago.
Yes I'm pulling the boat out now
Expert:  Charles replied 1 year ago.
You can do it with the engine running either on the hose or in the water.
Customer: replied 1 year ago.
Ok i took the oil cap off and was running the motor and the alarm went off with the float in the down position. when i move the float up, the alarm goes off again
Expert:  Charles replied 1 year ago.
did the tank ever fill up?Try this, turn the key on, remove the cap from the tank, the alarm should sound. When it does, move he float back to the top of the shaft, after a few, the alarm should stop.
Customer: replied 1 year ago.
the tank filled up but the alarm sounds after the float is up, if i hold the float down the alarm turns off after a few seconds and immediately comes back on if the float is raised
Expert:  Charles replied 1 year ago.
Do you have the cap upside down?
Customer: replied 1 year ago.
no
Expert:  Charles replied 1 year ago.
The alarm is supposed to start when the float goes down toward the open end of the shaft. The alrm is suposed to stop when the alarm goes to the top of the shaft near the cap threads.
Customer: replied 1 year ago.
correct, it's doing the opposite
Expert:  Charles replied 1 year ago.
Have you replaced it recently?
Customer: replied 1 year ago.
no, i have not
Expert:  Charles replied 1 year ago.
Ok, Follow the wires from the float the the connectors. Make sure that the blue goes to the blue and the black goes to the engine block.
Customer: replied 1 year ago.
They do
Expert:  Charles replied 1 year ago.
You just have a bad float. Replace that and the alarm will stop going off.
Customer: replied 1 year ago.
Any ideas on the overheating? Running on muffs the cylinder heads are too hot to touch and water from telltale is also very hot
Expert:  Charles replied 1 year ago.
When you last did the impeller, did you also do the gaskets and install a slinger ring on the outside of the water pump housing?
Customer: replied 1 year ago.
Yes and a new upper housing
Expert:  Charles replied 1 year ago.
Did you replace the t-stats?
Customer: replied 1 year ago.
No, I removed and inspected them. Then tested in hot water to make sure the opened, they opened up at about 145
Expert:  Charles replied 1 year ago.
Ok, Do you have a water pressure gauge?
Customer: replied 1 year ago.
I do not
Expert:  Charles replied 1 year ago.
For the engine that is. It would be on the dash.
Customer: replied 1 year ago.
There isn't one
Expert:  Charles replied 1 year ago.
Ok. Are you still getting the solid alarm when in the water?
Customer: replied 1 year ago.
At wot after about mile, on muffs it doesn't go off but the telltale and heads get too hot to touch
Expert:  Charles replied 1 year ago.
how do the spark plugs look?
Customer: replied 1 year ago.
plugs look good, a little carbon and oil but very minimal, plugs are new this season
Expert:  Charles replied 1 year ago.
Is any one plug whiter than the others?
Customer: replied 1 year ago.
Piston is fried on #1
Expert:  Charles replied 1 year ago.
The piston is bad?
Customer: replied 1 year ago.
Yes
Expert:  Charles replied 1 year ago.
How did you notice that?
Customer: replied 1 year ago.
Did a compression test 120 on all cylinders but one, removed head hoping for a blown head gasket, head and piston are damaged with light scoring on cylinder wall
Expert:  Charles replied 1 year ago.
Ouch. That could have happened due to it overheating. Are you planning on rebuilding the engine?

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