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Old 06 October 2015, 16:10   #1
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98 Mariner 90 hp Oil Alarm

Oil alarm (intermittent) went off on my 90 hp 1998 mariner outboard. Tank was half full but added about 2 quarts. However, oil alarm still sounds. Anyone know if there is a reset or such?
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Old 06 October 2015, 17:03   #2
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Has the float in the tank stuck?
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Old 09 October 2015, 16:53   #3
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Doesn't have a float! It has a sender that measures resistance. Oil has a different resistance to air. It could be a faulty sender, if it starts beeping at you when you have oil in the tank just unplug it, if it switches off change the sender. If it keeps going it could also be the temp sender or the oil warning module which sits on the side of the block, little black box with two bolts holding it on, the sender wires run to the warning module so should be easy to find.
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Old 12 October 2015, 08:43   #4
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Intermittant Sounding Oil Alarm

Thanks for the replies. Don't believe there is a float as the second poster noted - fished around the oil tank and couldn't contact one. Alarm continues to go off without starting the engine - just by turning the key so battery is engaged. Will need to get it corrected as it is quite the annoyance! Any other thoughts/suggestions are appreciated.
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Old 12 October 2015, 11:48   #5
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Turbo diesel is completely correct. 25 years in the trade and used to work for the Uk Distributor would give him the knowledge.
Let me re iterate what he has said:

There is no float on that engine in the oil tank... its just a brown pencil looking thing that can split..so withdraw it from the tank (being held in by a single self tapper into plastic underneath and check it out if you want..
so undo one of the oil tank wires. if the beeping stops then that's your issue. if it doesn't then unplug your cylinder head temp wire (by the spark plugs) and test again. if it still does it then its the module which is a small black box on the right hand side of the block (looking from the rear)
The module feeds both the temp sender AND oil tank resevoir
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Old 12 October 2015, 11:56   #6
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Oil Siren

Thank you very much. Will try out the recommended troubleshooting steps. Thanks again. Very much appreciated!!!
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Old 13 October 2015, 01:49   #7
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If you find it's the control module then post your findings, I may have a unit.

I had to replace the modules on my '96 60hp engines, I bought a 90hp module by mistake so I should still have it in my box of bits.
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Old 17 October 2015, 01:29   #8
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25 years in the trade? Not yet!! 18 years so far!!!
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Old 31 October 2015, 20:37   #9
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Hi,
Sorry, new to this forum so not sure if this is ok.
Have got exactly the same problem with my 96 3 cyl Mercury 80. Have replaced the temp sensor and disconnected the oil sensor but warning buzzer still going off so think I really need a warning module.
Any chance the 90 and 80 modules are the same or best place to get one ?
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Old 01 November 2015, 08:10   #10
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Oil/Temp Warning Buzzer !

Hi,
Sorry, new to this forum so not sure if this is reply OK as did a 'quick reply' before ?

Have got exactly the same problem as previous post with my 90's 3 cyl Mercury 80. Have replaced the temp sensor and disconnected the oil sensor as per manual diagnostics but warning buzzer still going off so think I really need a warning module.
Any chance the Mercury 90 and 80 modules are the same or best place to get one second hand ?

I have been in touch with someone who has suggested to disconnect the module and do away with the oil injection pump and tank and work off premix 50:1 but not sure how the temp sensor is going to work ? I would prefer to get everything working as original if possible as I am sure oil injection is working as using some premix for first run and engine is pretty smoky and plenty of oil in test tub from exhaust !

Any help advice greatly appreciated !
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Old 01 November 2015, 08:48   #11
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Turbo (Robby) You poor OLD sod. all the best alan (uncle al)
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Old 23 October 2020, 18:54   #12
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90hp 2stroke Mercury oil warning module

Recently had problems in this unit and find that the sensor - two blue wires is not connected so presumably faulty. I have had the boat for three years now and only problem with oil was putting too much in the tank and having it spill out on tilt. Recently the oil warning alarm started going off. I disconnected the module and it stopped so assume faulty module. Why would - should I bother replacing it if the sensor is not connected??
Oil is clearly getting mixed OK as the engine is running fine. As long as I remember to check and top up oil what possible advantage trouble shooting and replacing faulty module??
On the other hand any easy way to check oil mixture is good??
First time on this forum so keen to hear from you.
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Old 24 October 2020, 03:52   #13
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There is a bit in the Tank that falls off and makes the sensor think the oil is low. This happened on my 60hp exactly the same. It is very difficult to replace and get a part. I have just disconnected the sensor. Not the best thing to do I know but as it just tells you when you 2 stroke oil is low I just check my oil on every outing Good thing to do anyway I think
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Old 24 October 2020, 13:29   #14
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Hi smallribber,
Yes the sensor has been disconnected all the time I have owned the boat - about three years. What happened recently was the alarm was going off even with no sensor!! I disconnected the module the sensor had been connected to and now no alarm. My quandray is whether to replace that module with a new one costing A$175?
Prior to taking it out the alarm went off as soon as I turned the ignition on - then went off when the engine fired up. Now there is no alarm with ignition on. It seems the low oil warning module may have another function as apart from the two blue wires connecting the sensor there is ground on black then brown to the alarm and purple in.
Somebody more knowledgable may know if the module has another function other than passing on the oil sensor condition?? Otherwise I am inclined to leave it out. The less components in use , the less failures can happen.
Many Thanks for your input and
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Old 25 October 2020, 01:56   #15
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Doesn't that module do the overheat alarm too?
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Old 25 October 2020, 02:21   #16
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there is a water pressure sensor, which played up on my 90. it alarmed at 4000 rpm plus and silenced below that. might be worth looking at.

Changed the unit.... all ok now
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Old 25 October 2020, 19:47   #17
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Hi A1,
No the temp. sensor connects after the oil low module. It remains in circuit even with the module removed.
I am leaning more towards simply discarding the module as it appears to serve no purpose when there is no sensor.
Thanks for your input and
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Old 26 October 2020, 02:41   #18
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Had similar with a Mariner with the added excitement of occasionally blowing a fuse . Turned out to be a bare wire in the control box earthing when moving the lever . Only happened once or twice before I found the culprit and put some heat shrink on it.
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