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Over Heat Sensor
- Thread starter revereamg
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timmyboy76
New Member
something about, drop'n it in boiling water, and you'll see something close on bottom end of it. Someone might give more detail, or "search" forum, should be something mentioning it..
rippinsurf
New Member
heat sensor test
to follow up his boiling water idea, you need an om's tester (the lil horse shoe shaped symbol on a volt meter), and a temperature guage for testing water. you need to look up and find out what temperature the heat sensor closes at. ground the tester on the sensor with the black wire, then touch the red wire to where the plug plugs into it, it should read (1) for no resistance, when the sensor closes (setting off the beeper) there will be resistance and it will measure that on the tester. should go to (0) but either way the measurement dont matter, only whether the sensor closes or not. put the sensor in the water (not the electical end) and begin boiling the water with the tester hooked up to the sensor, when the tester reads resistance or goes to (0) or when it changes, you know the sensor has closed. look at the temperature at which it closed and then find out whether or not its good by comparing to when the temp is SUPPOSED to close it.
hope this helps, confuseing i know but i did my best to explain. ,greg
to follow up his boiling water idea, you need an om's tester (the lil horse shoe shaped symbol on a volt meter), and a temperature guage for testing water. you need to look up and find out what temperature the heat sensor closes at. ground the tester on the sensor with the black wire, then touch the red wire to where the plug plugs into it, it should read (1) for no resistance, when the sensor closes (setting off the beeper) there will be resistance and it will measure that on the tester. should go to (0) but either way the measurement dont matter, only whether the sensor closes or not. put the sensor in the water (not the electical end) and begin boiling the water with the tester hooked up to the sensor, when the tester reads resistance or goes to (0) or when it changes, you know the sensor has closed. look at the temperature at which it closed and then find out whether or not its good by comparing to when the temp is SUPPOSED to close it.
hope this helps, confuseing i know but i did my best to explain. ,greg
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Good reply Greg. Here is a little more information to help out.To check the temp. sensor un plug it, and see if it still beeps. The sensor is designed to make contact inside the switch when it reaches 205*f. If its bad replace it. if you ground the connector on the temp switch it will also cause the beeper to beep.
Karl
Karl
papabear1996
New Member
Karl, How would I know if the connector is grounded to the switch? I have a single light brown lead coming from the temp sensor. On our maiden voyage after about a minute the alarm started screaming and we took her out of the water to investigate. On our second test she ran like a top but the alarm was beeping again, disconected the lead engine remained nice and cool with plenty of water flow. hooked up lead a few times and alarm sounded. My temp sensor is in uper right corner above spark plugs. does that make any difference? I have a new sensor on order but your statement about grounding makes me wonder if that is the problem. How do I check? One other point of interest is this is a SBT rebuilt with 3 hours on it, still in the break in with oil in fuel and in oil injection tank.
Thanks
Jeff
(Jet Boat Newbie)
1996 Challenger
Jeff, you can check the temp sensor by removing it and using a multi meter to see if you have continuity from the connector plug on top to the bottom. If you have continuity when it is cold, the sensor is bad. If you have no continuity you can test it by putting it in a pan of water and bring the temp up to about 205*f. Carefully, wearing gloves or a pot holder check to see if you have continuity from top to bottom. The sensor is just a heat sensitive switch that makes contact as the switch expands to complete a circuit in the sensor, causing the switch to allow ground to the cylinder head.
If you touch or ground the brown wire to the cylinder head it will cause the beeper to sound too, kinda like the temp sensor does when it gets hot from being over heated as if you had a cooling problem. It sounds like it is the sensor that is bad. You don't want to run it, and chance a over heat condition. I hope this explains the heat sensor and it solves your problem.
Karl
If you touch or ground the brown wire to the cylinder head it will cause the beeper to sound too, kinda like the temp sensor does when it gets hot from being over heated as if you had a cooling problem. It sounds like it is the sensor that is bad. You don't want to run it, and chance a over heat condition. I hope this explains the heat sensor and it solves your problem.
Karl
papabear1996
New Member
Karl,
Ok Not continuity when cold, about half reading when hot. Also when I touch brown lead to the block, I really have to work at it to find a spot to get the buzzer to go off. The test suggests the temp sensor is ok, so where do I go from here. The buzzer was sounding less than a minute into the ride. I have a hard time believing it had already gotten hot enough to trip the sensor. I bought the boat this winter and it has a new rebuilt sbt motor in it. One point of interest is the temp sensor is in the upper right hand corner of the top of the motor, not between the plugs as others have mentioned. Cooling system seams to be fine, water flows well from the "pee" hole and the motor was cool to the touch after running for a half hour. When I got the boat the lead was disconected from the temp sensor.
Any input would be appreciated.
Jeff
Ok Not continuity when cold, about half reading when hot. Also when I touch brown lead to the block, I really have to work at it to find a spot to get the buzzer to go off. The test suggests the temp sensor is ok, so where do I go from here. The buzzer was sounding less than a minute into the ride. I have a hard time believing it had already gotten hot enough to trip the sensor. I bought the boat this winter and it has a new rebuilt sbt motor in it. One point of interest is the temp sensor is in the upper right hand corner of the top of the motor, not between the plugs as others have mentioned. Cooling system seams to be fine, water flows well from the "pee" hole and the motor was cool to the touch after running for a half hour. When I got the boat the lead was disconected from the temp sensor.
Any input would be appreciated.
Jeff
timmyboy76
New Member
Hey Jeff...had same prob with my Sportster 1800...ended up being that the same sound will happen with a "low" fuel tank. My gauge dont work so, it reads empty. Damn thing would not shut up, so while riding, disconnected the temp sensor wires, still beep'n, then disconnected the fuel sending unit plug, and WHAMO...sound went away...
papabear1996
New Member
Timmyboy,
Thanks for the response, but My beep stops when I disconect the lead to the temp sensor. Crazy thing is I can litterly touch the motor and it is cool. I want to believe it is something goofy with the wiring, but don't want to risk cooking a new motor.
Jeff
Thanks for the response, but My beep stops when I disconect the lead to the temp sensor. Crazy thing is I can litterly touch the motor and it is cool. I want to believe it is something goofy with the wiring, but don't want to risk cooking a new motor.
Jeff
timmyboy76
New Member
havn't tried it, but see if you can remove the wire from the "plug", cut it 1/4in, then re-hook-it-up
papabear1996
New Member
I will trim the wire and put on a new plug, just for good measure. Does my boat have an oil sensor? If so could the beeping be from the excessive oil in the fuel and the injection oil during the break in?
Jeff
Jeff
Your boat has a LOW oil sensor...it can't tell how much premix or how little the mix is. The reason you have a problem getting the Temp Sensor wire to make the beeper beep, is because it isn't getting a good connection through the painted surface. That's why it has a "sensor". You need to check the Temp sensor to see if it is causing a connection at a lower temp. It might be making a connection at say 90*f causing it to beep prematurely. Test it in a pan of water at different temps. Use a high temp Thermometer in a pan of water on the stove for accuracy. Do a continuity test at different temps. If you can just get a new temp sensor, just replace it. The location isn't important where it is located in the cylinder head, just that it is in the cooling stream of water on the engine. The Temp Sensor is not connected to any other component on the seadoo...just the temp sensor...not the fuel or the oil tank. The only common component is the beeper it's self. There is only 1 beeper.
Karl
Karl
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papabear1996
New Member
Karl,,Installed new temp sensor, took it out this weekend. No beeps, No Sounds, No Errors.. Thanks for all the great information.
Jeff
Jeff
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