maybe a sensor??

[1fast6]

Took the boat out last week and the overheat warning came on twice. Both times I turned off engine and restarted. Warning stayed off.
Took out yesterday and went about 10 miles up the coast, pissin good, running good. Went into a channel, puttered around and then came back out of channel. Got boat on plane and warning went off. Shut down and immediately restarted with no warning sounding. Headed back to ramp(10miles) with no issues. Sound like maybe a bad sensor?
Any ideas?? thanks.

 

[j_martin]

Re: maybe a sensor??

Maybe something is wrong, would you think?

Run it till it seizes up, then it'll be easy to figure it out.

Meanwhile, it would help to know if we're talking about a 10 horse on a tinny, or a V6 fuel injected engine.

Is the alarm a beeping, or a solid tone?

 

[1fast6]

Re: maybe a sensor??

Maybe something is wrong, would you think?

Run it till it seizes up, then it'll be easy to figure it out.

Meanwhile, it would help to know if we're talking about a 10 horse on a tinny, or a V6 fuel injected engine.

Is the alarm a beeping, or a solid tone?

thanks for the help.. Were talking about the engine in my sig. 1999 200 2-stroke carb mariner. As for siezing up. The water coming out of the **** hole is no hotter than expected. No steam, not extreamly hot. Has good solid steam. Becuase were talking about an "over heat" tone I would assume you would have known it was steady.
Why would the alarm go away immediately after shut down and refire with no cool down time? Did it twice on a short trip then only once on the 20 mile trip.

 

[j_martin]

Re: maybe a sensor??

thanks for the help.. Were talking about the engine in my sig. 1999 200 2-stroke carb mariner. As for siezing up. The water coming out of the **** hole is no hotter than expected. No steam, not extreamly hot. Has good solid steam. Becuase were talking about an "over heat" tone I would assume you would have known it was steady.
Why would the alarm go away immediately after shut down and refire with no cool down time? Did it twice on a short trip then only once on the 20 mile trip.

The alarm circuit is normally high (12V) and whatever sets it off grounds it. That wire comes from the OH sensor, the oil alert, and threads through the engine, the wiring harness, the front control set, and on up under the dash in some instances. Ground it anywhere and it goes off.

Intermittent ignition power to the oil alert module will make it do strange things.
The OT sensor could be getting flaky also. They do that sometimes.

(edit) After re-reading your original description, you might have wrapped a lily pad or sandwich bag in the bog, and when you shut down, it fell off. That happens sometimes, and is exactly what the overheat sensor is made to deal with.

hope it helps
John