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Author Topic:   Overheating warning
greyg8r posted 01-17-2004 12:11 PM ET (US)   Profile for greyg8r  
My overheat horn does not work. When I ground the wire with the key on, there is no horn sounding.

I am going to replace the control anyways, but, for now, is there an overheat risk as long as there is a steady stream from the water pump indicator?


Clark Roberts posted 01-17-2004 03:30 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Grey, yes, there is an overheating risk even when tattle tale stream is flowing for it only tells you that the water pump is working and not that engine is being cooled properly. There could be internal water passage restrictions, corrosion etc. that would cause overheating while tattle tale is pushing loads of water. See current posts in topic by Bigshot about thermostats. A cooling water (jacket water) temp gauge or a cyl head temp gauge plus a jacket water pressure gauge (tapped in at upper most cyl) will help detect cooling problems/trends. That audible alarm is a very important warning device even with the above two gauges... Happy Whalin'.. Clark... Spruce Creek Navy

lhg posted 01-17-2004 04:59 PM ET (US)     Profile for lhg    
Don't know what kind of engine you have, but on Mercury engines with oil injection, the warning horn, in the ignition harness just behind the key switch, the horn sounds a long beeeeeeeeeep, then beep-beep, every time you turn the key switch to "on", before activating the starter. This lets you know your warning horn circuits are working each and every time.

The long beep is overheat, the intermitent beep, beep, beep is oil injection function.

I would get it fixed right away, as the overheat horn can save the engine, definitely.

Tom2697 posted 01-19-2004 12:13 PM ET (US)     Profile for Tom2697  Send Email to Tom2697     
I agree with both people here.
The warning beeper (aka - idiot horn) often tells you about the problem after you experience the problem or right before you have a problem. OMC even says to re-torque your head bolts after the buzzer sounds. In other words, you already have a problem that needs to be fixed. A good gauge will allow you to notice any changes in run performance and with experience, allow you to prevent a problem (ie - seaweed partially blocking cooling water flow).
lhg posted 01-19-2004 03:53 PM ET (US)     Profile for lhg    
I think the warning horn is absolutely essential, as when you are out running, even with temp and water pressure gauges, you're not constantly watching them at all. It should not be considered a dispensable "idiot" function.

The warning horn saved one of my 200's one day, while cruising along at 30 mph enjoying the scenery. All of a sudden, the horn went off while nobody was looking at the gauges.

We stopped, tilted up the engine, and found we had picked up a plastic bag. The horn definitely saved the engine. These manufacturers know what they're doing.

Tom2697 posted 01-19-2004 05:01 PM ET (US)     Profile for Tom2697  Send Email to Tom2697     
Good thing that horn worked for you!

Personally, I want and use both on my boat. My temp gauge is a conductive sensor that reads off one of the cylinders. I'm not sure how my horn is connected.

I am accustomed to constantly monitoring gauges in my boats, trucks, motorcycles, etc. If I ever go more than 5 minutes without checkng in on the gauges I will be surprised. But, I've seen motors fry themselves within that same 5 minute timeframe. This is where the horn comes into play.

greyg8r posted 01-19-2004 05:02 PM ET (US)     Profile for greyg8r    
I didn't want to go through the effort of replacing the horn in my old side-mount control.

I have purchased a new top mount binnacle control with a horn and will be installing that in a few days.

Thanks for sharing your views.


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