Mariner 115 Alarm

[JDusza]

Hi,
I've got a mariner 115 which was run low on oil. The alarm sounded. Engine was shut down.
Now, when the ignition key is turned the alarm goes off and will not stop. The engine will run with the alarm going off.
Is this steady beeeeeeep the over-heat signal or oil?
Thanks,
J

 

[carholme]

Re: Mariner 115 Alarm

From 3C-4 in the manual:

6. Timing and Protection Module (TPM) for
(S/N-0G589999 & Below)
If the oil in the reservoir drops to less than 7 fl. oz.
(200 cc), the low oil sensor in the reservoir will
signal the warning module to activate the warning
horn. If the powerhead temperature should exceed
190??8?F (88??13?C), the overheat temperature
sensor in the water jacket cover will signal.

Disconnect the wire going to the sensor on the water jacket and if the horn continues you will know it is the oil alarm.

Gerry
the warning module to activate the warning
horn.

 

[Texasmark]

Re: Mariner 115 Alarm

I do know that on some engines you can have two signals, especially with the Oil Warning Module that Carl referred to and is in my manual for the 115 hp engine. Since it is an electronic module it can modulate the low oil signal from the tank and cause it to beep beep beep in a regular pulsed rate. The Over Temp signal is a solid ground to the horn causing a solid horn blowing. Without the module, which some engines in that 3-4 cylinder series don't have, you have no way to modulate the oil warning so you get a ground for either and have to decide which it is but with the module you don't have to guess.

So, you didn't mention it but if it's your oil sensor acting up it will be pulsed. Or do as he said and disconnect either one of those Lt. Blue wires or get the Tan/Lt Blue wire which is the OT and disconnect it. Either will give your your answer.

Since you shut down your engine when the alarm sounded you didn't hurt anything. It goes off before you run out of oil with margin to spare. If you fill up your tank and it remains, your alarm sense magnet in the tank may have fallen off....it happens, causing the sensor to think the tank is empty.

HTH,
Mark

 

[JDusza]

Re: Mariner 115 Alarm

Thank you. I will check these things this evening...
Cheers!
Jim

 

[JDusza]

Re: Mariner 115 Alarm

The current alarm is constant. I will pull the sensor wires to verify, but, ....
Here's where I am stumped: if the constant alarm is temperature, why am I getting the warning signal right when I turn the ignition key? The engine is presumably cold, hasn't run for days... I am not aware that the overtemp circuit has memory. Is the over-temp circuit holding a fault flag?
Does the over-temp circuit have a memory that must be cleared to eliminate the beeping, or, is the oil circuit barfed, e.g., the oil level sensor whacked?
Why would you get a constant beep when the key is turned?
Time for me to STOP THINKING!!!
Cheers!
J

 

[carholme]

Re: Mariner 115 Alarm

James;

Definitely stop thinking, I can feel the heat from here. The temp sensor is not a sensor but rather a bi-metallic switch/sender designed to go off and warn before things get really bad.

Gerry

 

[Texasmark]

Re: Mariner 115 Alarm

James;

Definitely stop thinking, I can feel the heat from here. The temp sensor is not a sensor but rather a bi-metallic switch/sender designed to go off and warn before things get really bad.

Gerry

It is supposed to close at 195F on an over temp condition and clear once the temp has dropped below 175. As I said, the stat opens at 143 at low rpms and above 2500 it's out of the circuit as the bypass valve lets water free flow through the engine.

IF the sensor shorts internally, it is connected to ground 100% of the time and you will have a ground on the low side of your horn with switched 12v on the other. Same thing if you have an oil tank malfunction with the sensor....just a different type of circuit. That will give you an alarm immediately when you turn the key to on.

Mark

 

[carholme]

Re: Mariner 115 Alarm

James;

I think you will find that your engine has a 120 degree thermostat but you can see these in the manual.

Gerry

 

[JDusza]

Re: Mariner 115 Alarm

Thank you, all. I expect to get back to it tomorrow.
Cheers!

 

[Texasmark]

Re: Mariner 115 Alarm

James;

I think you will find that your engine has a 120 degree thermostat but you can see these in the manual.

Gerry

Hey Jerry, what does your data show for the stat opening temp for a 2002, 90 Merc?

Never mind. I went to your Crowley marine site and plugged in my engine serial number. Got the right pullup then went to engine block like you did here and on a 40 hp engine and got a 120 number listed in the part column (#35 in the parts list) like you did on this thread for a 150.

Sorry sir, but that number isn't representative of what is in an engine coming off the Mercury assembly line. My OEM stat was stamped 143 on the pellet which is the opening temp just like on my son's 150 was stamped on both OEM stats. And when we replaced them we ordered new stats and they too were 143F stamped.

Thanks,
Mark

 

[carholme]

Re: Mariner 115 Alarm

Mark;

No idea what you are talking about. We are discussing a 1997 Mariner 115. Where does the 40hp, 90hp and 150hp come into it?

Gerry

 

[Texasmark]

Re: Mariner 115 Alarm

Mark;

No idea what you are talking about. We are discussing a 1997 Mariner 115. Where does the 40hp, 90hp and 150hp come into it?

Gerry

The thermostat opening temperatures you mentioned from data you got from the Crowley www. No big deal, but it is inaccurate. It could cause someone not knowing, to look at their stat pellet and not see that number stamped on it and think that they had the wrong stat when they didn't.

Mark

 

[carholme]

Re: Mariner 115 Alarm

Here is the required thermostat from the Brunswick/Mercury site for a 1997 Mariner 115.

36 14586 1 THERMOSTAT

Which is a 120 degree thermostat.

Gerry

 

[Texasmark]

Re: Mariner 115 Alarm

Here is the required thermostat from the Brunswick/Mercury site for a 1997 Mariner 115.

36 14586 1 THERMOSTAT

Which is a 120 degree thermostat.

Gerry

So sir, how do you know for sure it is a 120 degree stat? Have you purchased one and tested it? Why would an OEM have one engine in a series with a 120 degree stat and others with a 143? Why would a 40 hp engine have a 110 stat and a higher hp another temp. They both operate under the same conditions.

On the 75, 90, 115, and 125 three and 4 cylinder semi-current designed engines, the engines are the same, mfgr'd in the same time frame at the same facilities using the same parts, bar the differences between the 75 and 90 triples and the 115 and 125 4 bangers. Being a retired OEM engineer myself from a Fortune 500 company, I really doubt they are different. Guarantee you I @#@#@ know what I have in my hand when I read the stamping on the pellet regardless what the www parts list says and you think!!!!!!!!

Like I said, it doesn't really matter to me other than someone out there looking up numbers and telling me what I have in my hand and that it's different than what I see, and on the flip side other not knowing folks that think that the real number is 120 when it's not....just gets in my craw. I read your profile and you are no expert. You are just reading numbers off a www that you think mean what they don't.

Hope this is the end of this.

Mark

 

[carholme]

Re: Mariner 115 Alarm

James;

I am not going to continue with this nonsense and I do not have a need for the last word. I just hope you get your problem worked out. Good Luck with it and I hope the manual helps.

Gerry

 

[JDusza]

Re: Mariner 115 Alarm

Well, ... I do need the manual. I removed the temp sensor wire and what I think is the low oil sensor and the beeping continues.
J

 

[holorinhal]

Re: Mariner 115 Alarm

I have the same thing going on, with my 88 100 hp.
At key on, engine not running, the oil warning alarm starts beeping imediately, and does not stop. Not a solid tone, rather a rapid beep, beep, beep , beep.
At the bottom of the oil tank, i have two white wires comming from the tank, pluged into two blue wires. While the key is on snd the alarm sounding, i unpluged one wire and the beeping stoped. I pluged it back in and the beeping started again. I unpluged the second wire and the beeping stoped, pluged it back in and beeping started again.
So i know for sure that it is the oil warning, I just dont know where to go fom there.
Dont know if yours is the same, but you could try that method, to isolate which alarm is sounding, if still confused.