emergency beeping sound

[btr0037]

1993 Mariner 90 hp<br /><br />Started an emergency intermitant beeping sound at the throtle control unit. Has never done this. Oil injection tank is full and water is coming from the water pump observation outlet. Engines sounds good, but am concerned about operating it. What do I check, a sensor? Checked again in the driveway with the muffs on and the emergency beeping sound starts up immediately, even before the engine has started.<br /><br />RP

 

[Silvertip]

Re: emergency beeping sound

The beeping warns of overheat or low oil. If the oil tank had sufficient oil in it, either the oil sensor is bad, the engine temperature sensor is bad, or there is short to ground in the temperature sense circuit or low oil circuit or the alarm module itself is bad. I doubt the engine is overheating since the alarm sounded immediately when using muffs (assuming the engine was cold when the alarm sounded). Do the obvious first. Using an ohm meter, disconnect the temp sensor. Insert one lead into the wire on the temp sensor. Touch the other lead to a good ground. If continuity is shown with a cold engine the temp sensor is bad. If an open circuit is shown, its ok. Visually check the wiring to see if some wires have been chaffed and are shorting.

 

[Laddies]

Re: emergency beeping sound

Beeping is for low oil, could be a bad sensor as upinsmoke mentioned the other problem is the magnets on the float in the tank come lose, the way to test for that is cover the tank vent with something and with the key on turn the tank over if it stops the beeping the magnet is lose--Bob

 

[btr0037]

Re: emergency beeping sound

Thanks for the suggestions. I was waiting for my repair book to arrive which I ordered from the site.<br /><br />OK, I have determined it is the float device. When I turn it upside down, it stops beeping. Also, when the metal sensor rod is removed from inside the float, it stops. So how do I change the float? It looks like a glued in disk holds it in place, but what kind of glue would be used for re-assembly?

 

[kchunn]

Re: emergency beeping sound

If you're talking about the oil sensor on the small tank mounted to the engine, you have to replace the unit. It comes as one piece, new oil cap, sensor, and two wires. Takes about 5 minutes to install. I just replaced mine on a '91 Mariner 175 horse and the part was about 35 dollars. The cap was cracked on mine. Very common problem.

 

[papasmurf]

Re: emergency beeping sound

I've repaired the floats before but can be a pain in the butt. But the labor charge now is probably more than the tank is worth.

 

[btr0037]

Re: emergency beeping sound

the float I am referring to is in the engine oil tank. It is on the bottom of the oil tank. Do I have to purchase a whole new tank, or just the oil sensor float device? <br /><br />1993 Mariner 90 hp

 

[papasmurf]

Re: emergency beeping sound

The engine oil tank has a magnetic fiber washer attached to the bottom of the float. After a time, the epoxy will come loose and the magnetic fiber washer will drop off and slide down the shaft that supports the float. The sensor is inserted into he center of the shaft on the bottom of the tank. When the magnet slides over the sensor, the signal is sent to the oil warning module which in turn sends a signal to the warning horn. That is how the system works and the tank and float comes only as an assembly.

 

[Moody Blue]

Re: emergency beeping sound

I have the same problem with my sensor. Not worth the time or expense to replace it. Just make a habit of checking the level with each fillup of gas and never let it get below 1/2. There was a thread recently where someone described how they repaired this themselves. Sorry I don't recall who. Do a search for oil magnet and see what turns up.

 

[papasmurf]

Re: emergency beeping sound

I posted this on September 12, 2005 11:19 PM <br />--------------------------------------------------------------------------------<br />I've fixed quite a few of these tanks with the magnet problems. You need a long thin straight slot screwdriver to get down to the keeper that holds the float on the shaft. Insert it in one of the slots in the keeper and simply unscrew it from the shaft. Clean the float and magnet and use a two part epoxy to reattach the magnet. I use mechanical fingers to place the keeper on the shaft and then just tap it down a little.

 

[btr0037]

Re: emergency beeping sound

Thanks to everybody for the tips. I was just going to disconnect the oil sensor until I got a quote for the replacement tank and float sensor for $27. I let other folks operate this boat some, so I was concerned about their attention to details (and knowledge of stuff), such as the oil level. This price seems reasonable and the installation does not look too difficult.

 

[Moody Blue]

Re: emergency beeping sound

$27 for a new tank ? Please let us know where and I will buy one also. The switch alone would have cost me almost that much. <br />You are correct as far asd the installation goes. Should take about 1 hour tops from start to finish. While you are in there, why not replace all the old oil lines as well. The existing ones may be getting hard and brittle by now.

 

[btr0037]

Re: emergency beeping sound

Just completed the installation of the new oil tank/sensor float. The alarm does not go off any more! Thanks for your advice.<br /><br />Purchased from marinepartsrus.com<br />800-595-3193<br /><br />cost:$26.57

 

[Moody Blue]

Re: emergency beeping sound

Thanks for the source. I wonder if they ship to Canada?<br />Did you replace the oil lines? The lines on my 1992 motor had gotten very hard but had not cracked yet. I replaced them all with new polyurethane lines so I never have to worry about them. If thoses were to fail, you have no way of knowing until the overheat alarm starts going off then it may be too late.

 

[btr0037]

Re: emergency beeping sound

I have to admitt I did not repalce the lines as advised. They seemed a little hard but still seemed servicable. I used the plastic zip pulls to secure the lines, which do not usually break them as readily as pipe clamps and other clamping devices. <br /><br />I replaced the spark plugs, wires and fuel filter while doing this. I am trying to replace the impeller but am afraid that the preventative maintenance could turn into a night mare. I have the $65 refurbish kit and am trying to figure out how to drop the lower unit.