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Author Topic:   Mercury Oil Injection Alarm BEEP-BEEP-BEEP
gosssandy posted 06-24-2006 10:19 PM ET (US)   Profile for gosssandy   Send Email to gosssandy  
I have a 1995 40-HP Mercury with oil injection that is doing the famous BEEP BEEP BEEP. I can make the BEEP BEEP BEEP error occur by just turning the key to the run position. At this point the motor is not started. By disconnecting one of the blue wires going to the sensor on the bottom of the oil reservoir this [alarm] does not occur. What might cause this problem? Thanks
jimh posted 06-24-2006 10:49 PM ET (US)     Profile for jimh  Send Email to jimh     
My article in the REFERENCE section explains the alarm system of the Mercury oil injection in detail, although it may not apply precisely to your specific model and year.
jimh posted 06-25-2006 09:12 AM ET (US)     Profile for jimh  Send Email to jimh     
This seems to be very common problem with Mercury motors with an oil injection system.

You will find prior discussion of problems with the Mercury alarm in the REPAIRS/MODS discussion area:

MERCURY Oil Injection Warning System

Mercury 1996 Outboard: Chronic BEEP-BEEP-BEEP

135 Blackmax oil injection alarm

If we assume that there is really no problem and the alarm is a false indication, the problem could be in one of three areas:

--there is a defective sensor sending a false alarm signal;

--the alarm module is defective;

--the ignition circuitry which sends a pulse signal to the alarm module has malfunctioned and is not sending the proper signal.

If you are lucky the problem will be a defective float level sensor. Not so lucky? Perhaps a new alarm module ($250). Really unlucky? The plastic gear driving the oil injection pump has failed. You will probably have to abandon the oil injection system as the repair of this would require total engine tear down. This is hardly ever done due to the excessive cost. Most owners switch back to pre-mixed fuel at this point rather than repair the plastic gear.

jeffs22outrage posted 06-26-2006 05:24 PM ET (US)     Profile for jeffs22outrage  Send Email to jeffs22outrage     
Just went through the same thing on a Merc 150 XR6.. Turned out to be a defective float switch in the end. Found this out after retrofitting a new oil pump.

rumrunner posted 06-27-2006 05:12 PM ET (US)     Profile for rumrunner  Send Email to rumrunner     
If oil is not getting to the reserve tank, make sure you check the primary oil tank screen as well. Not uncommon for that to clog.

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