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Author Topic:   Mercury 90 HP 2S Alarm on 170
AnthonyT2 posted 08-09-2004 06:36 PM ET (US)   Profile for AnthonyT2   Send Email to AnthonyT2  
A quick question about the alarms on the Mercury 90 HP 2 Stroke.... While I was out this weekend, on Sunday, with no problems on Saturday, an alarm came on which scared the Jesus out of me and my guest. It was a continous 2 tone alarm that would alternate between pitches. I quick turned off the engine and checked the oil whioch did seem a little low which i quickly filled. Restarted the engine and all was fine...

Was this alarm the oil low signal or something else that just happened to clear up when I turned the engine off ?

To make matters worse, I have not been filling the oil resevoir to the top since it appears to leak oil when the engine is tilted. This is my third season with no major problems and I want to keep it that way. From what I have read from other Forum members, I should probably change the Impeller and water pump at the end of this season. Is this the general consensus...\

By the way the 170 rocks... I have never regretted getting this boat....

Thanks in advance,

AnthonyT2 posted 08-09-2004 06:41 PM ET (US)     Profile for AnthonyT2  Send Email to AnthonyT2     
One more item which I totally forgot about...

The same morning when I went to prime the bulb, it was always soft. I thought is was because I just changed the line from one tank to another.. Maybe this is related to the first post in this thread, although the engine never seemed starved for fuel ?


Jimm posted 08-09-2004 09:38 PM ET (US)     Profile for Jimm    
Anthony, the book says the alarm will go off for two problems - low oil or overheating. You make the call.
fitn217 posted 08-09-2004 09:50 PM ET (US)     Profile for fitn217  Send Email to fitn217     
Anthony, I hear this alarm consistantly as I only put one quart of oil in my reservoir at a time due to the reservoir filler cap leaking when motor is tilted. I also find it easier to carry quarts as I don't have to carry a funnel and worry about storing it as it drips oil.
My bulb is soft because I disconnect the gas line from the tank after every use and drain the gas from the carbs with the motor trimmed all the way in. If I don't do this a gas and oil mixture will leak into the well.
If you don't take preventative measures with this motor you will wind up with a mess in the well from the oil reservoir and the carbs.
I just had my motor serviced by Merc dealer and he said to change impeller every other year. I have an 03 170 and I haven't changed it yet and haven't noticed any change in water pressure. However I will change it before next season.
stompy27 posted 08-09-2004 10:24 PM ET (US)     Profile for stompy27  Send Email to stompy27     
Hi Lo? Or Off and On? Both the Low Oil and Overheat use the same alarm sound (pitch, volume) which you can find up under the console. As the oil level decreases to a certain point, the alarm may alternate on and off for two reasons:

1. Trimming the motor up and down (attitude of the engine).
2. In conditions of choppy or swelling seas (attitude of the engine).

Once the oil level is so low those conditions do not affect it anymore it will remain steady.

The same alarm will also sound when the engine is in an overheated state in a steady signal of same volume and pitch.

My engine is a 2002 90ELPTO. There may have been changes to the actual hardware of the alarm that Mercury is using in 03, 04 and in 05’s that may produce a HI-LO pitch.


2002 170 Montauk

AnthonyT2 posted 08-10-2004 09:28 AM ET (US)     Profile for AnthonyT2  Send Email to AnthonyT2     
Thanks for all the responses...

The boat is a 2002 170 so we probably have the same engine and alarm. You would think that Whaler would at least have 2 different signals to distinguish which issue has occurred, overheating or low oil. I will need to see if the bulb remains soft this next weekend and see if I have a repeat on the alarm while keeping the oil at a reasonable level ( not too high and not too low ).

I guess from what I have heard so far, the soft bulb is totally unrelated to the alarm, correct ?

Thanks again for the responses...


stompy27 posted 08-10-2004 08:42 PM ET (US)     Profile for stompy27  Send Email to stompy27     
Keep in mind this would be part of the Mercury Pre Rig wiring harness and have nothing to do with Whalers end of the deal. All 90ELPTO's from 2002 should operate the same regardless of what boat they are hanging on.


Clark Roberts posted 08-11-2004 07:00 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
I have owned many, many Mercurys and all have had two different audible alarm sounds... a steady tone for overheat and a beep, beep, beep for low oil level. On my 115 Mercury four stroke (a'la Yamaha) I run a temp gauge and an oil press gauge just to be safe. I have temp guages on all my two strokers and also water press gauges on my V6's. Am I a gauge junkie????? You bet! I'd rather have too much info than not enough... beam me up! Clark.. Spruce Creek Navy
sumnerdav posted 08-11-2004 12:57 PM ET (US)     Profile for sumnerdav  Send Email to sumnerdav     
My 2 stroke 90 leaked oil when the engine was tilted up until I replaced the gasket on the oil tank cap.
AnthonyT2 posted 08-11-2004 11:38 PM ET (US)     Profile for AnthonyT2  Send Email to AnthonyT2     
Thanks again for the responses.... I need to look at the manual when I get back down to the boat and also try to replace the oil cap gasket....


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