Johnson 150 HP Oil Alarm Sounding

[Solidchevy502]

Have a 1996 Johnson 150 Hp. Alarm keeps sounding even though there is plenty of oil in tank. I'm guessing its a sensor. Any help would be great. Where is the sensor? If motor wasn't getting oil I think we would have a major problem.

 

[Chris1956]

Re: Johnson 150 HP Oil Alarm Sounding

That motor can have 4 alarms, if it is the new style with the 4 wire OMS pump. Older models didn't have the No oil alarm. The alarms are: Overheat alarm, low oil in tank alarm, no oil in OMS pump on motor and fuel restriction. You might pick up a service manual and see which alarm it is.

The oil tank has a float which sets off the alarm if the oil gets too low. The OMS pump (4 wire pump) has a motion sensor to check for oil being circulated. Fuel restriction has a vacuum gauge in the fuel line and the overheat sensors are on the cylinder heads.
You might run some 50::1 premix fuel until you get it sorted out.

 

[Solidchevy502]

Re: Johnson 150 HP Oil Alarm Sounding

Thank you for your help! I picked up a Seloc book. I'm going to start there. Thanks again.

 

[jeffersondodson561]

Re: Johnson 150 HP Oil Alarm Sounding

As you can see from this diagram, the vro needs to see a reference signal (from the stator), if it does not have the information the circuit board will sound the alarm. The low oil switch is activated by mechanical means, which is subject to failure, but not common since the check valves are swimming in oil constantly.

 

[Solidchevy502]

Re: Johnson 150 HP Oil Alarm Sounding

Do you know where the NO OIL sensor is located? Motor seems like it needs to run for 5 to 10 minutes before NO OIL light and alarm sound. Boat is out of water at the moment and oil can be seen as it is running. Just need help located no oil sensor

 

[hidef]

Re: Johnson 150 HP Oil Alarm Sounding

Is the alarm continuous or is is it rapid short tones? If it is continuous it is the low oil sender in the oil tank if it rapid short tones it is the no oil sensor in the OMS mixing chamber.

 

[Chris1956]

Re: Johnson 150 HP Oil Alarm Sounding

No Oil sensor in inside the OMS pump...

 

[jwellcraft]

Re: Johnson 150 HP Oil Alarm Sounding

Thank you for your help! I picked up a Seloc book. I'm going to start there. Thanks again.

Glad to hear you got a manual but you were better off getting the specific manual for your motor by Johnson Evinrude because the other manuals covers a range of HP's but you might find some helpful info in the seloc to help you there.

 

[Chris1956]

Re: Johnson 150 HP Oil Alarm Sounding

Sorry, late night. I meant to say. The "No Oil" sensor is contained inside the OMS pump. The "No Oil" sensor is only available on the 4 wire pump.

 

[Joe Reeves]

Re: Johnson 150 HP Oil Alarm Sounding

(VRO Horn Warnings)
(J. Reeves)

NOTE: I retired around 1991/92. Possibly some of the later V4 engines and others may also incorporate a fuel vacuum switch that would enable a fuel restriction warning to sound as mentioned below, an unknown factor to myself.

1 - A steady constant beep = Overheating - The V/6 engines, possibly some others, have a fuel restriction warning which is also a steady constant beep.

2 - A beep every 20 or 40 seconds = oil level has dropped to 1/4 tank. (Late model engine = Every 40 seconds)

3 - A beep every other second = VRO failure, air leak in oil line, oil restriction, (anything that would result in a lack of oil being supplied to the engine).

NOTE - If the warning horn is the black plastic (overpriced) three wire type horn, the warning horn should beep once when the ignition key is turned to the ON position. If it does not, it is either faulty or someone has disconnected it (a stupid move!). At any rate, if it does not beep which indicates that the horn is non functional, find out why and do not run the engine until the problem is corrected.