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Author Topic:   Merc Optimax oil alarm came on!!
zinny0753 posted 08-25-2002 09:54 PM ET (US)   Profile for zinny0753   Send Email to zinny0753  

I have a Ventura with a 135 Merc Optimax. Tonight the oil alarm would sound, three times every three minutes or so. RPM's were not affected. I check the oil lever and it looked low. I am assuming that is what the alarm was telling me.

Any thoughts??



zinny0753 posted 08-25-2002 10:26 PM ET (US)     Profile for zinny0753  Send Email to zinny0753     
I checked the oil level not lever. Sorry.


Tin Man posted 08-25-2002 10:58 PM ET (US)     Profile for Tin Man  Send Email to Tin Man     
I had a 135 Optimax that I ran low on oil once. By the time the oil alarm starts going off, you are probably empty in the remote tank and running off the engine tank. You need to take the cowling off and check the level on the engine tank. That tank needs to be full and purged of air. From what I remember there are two sensors on the engine tank. The upper one signals the low oil warning. When you reach the lower limit, the engine will not start. If the engine tank is full, but the oil alarm is still sounding, it may be the sensor or an obstruction in the oil line.
Jay A posted 08-25-2002 11:46 PM ET (US)     Profile for Jay A    
The low oil alarm was doing what it was suppose to do! You did what you are suppose to do,check the oil level and you found it low. Now add more oil! case closed!
jimh posted 08-26-2002 10:34 AM ET (US)     Profile for jimh  Send Email to jimh     
I am tempted to change the TOPIC line of this thread to "Optimax Alarm Systems Save The Day!"


zinny0753 posted 08-26-2002 12:04 PM ET (US)     Profile for zinny0753  Send Email to zinny0753     

Ain't that the truth!

I do have a question...when looking at the remote oil take, it has the two chambers, does it matter which side I add the oil?


bsmotril posted 08-27-2002 01:24 PM ET (US)     Profile for bsmotril  Send Email to bsmotril     
It has been my experience that the oil float on the cap of the in motor resevoir is the most likley component to fail causing intermittent alarms. also, battery voltage below 11.5 will cause various fake alarms on the optis.
zinny0753 posted 08-27-2002 02:37 PM ET (US)     Profile for zinny0753  Send Email to zinny0753     
Thanks bsmotril. I think it was just low on oil. I added a gallon to the remote tank. I started it up but the alarm was still going off. I thought there might be an air bubble so I loosened the cap on the remote tank and then let it sit for about 15 minutes. Seemed to do the trick.

I did not add any oil to the tank in the engine. I took off the cap and noticed it was down about a 1/3. I did notice that if you don't screw that little cap back on nice and tight oil will leak out!

Is there a switch that feeds oil into the small tank on the port side of the engine?

Thanks for everyone's comments.

bsmotril posted 08-27-2002 10:15 PM ET (US)     Profile for bsmotril  Send Email to bsmotril     
The engine tank is fed by the force of pressurized air pumped into the remote resevoir. That is why you have two hosed going to the remote resevoir, one pumps in air, the other sends oil to the engine tank. Be careful not to screw the cap on too tight on the motor resevoir. If you do, it will crack and leak oil when the motor is tilted up.
Tin Man posted 08-27-2002 10:46 PM ET (US)     Profile for Tin Man  Send Email to Tin Man     
They outline the procedure in the owners manual. I just filled the engine tank manually with a small bottle. I think you can also turn the switch on, loosen the cap and let the pressure fill the tank.

When I ran out of oil, it was 35 miles offshore. I had plenty of time to read the manual while waiting for my buddies.

As a side note, since the Opti's use a low pressure gas delivery system as well, it is important to make sure the gas bulb is primed before attempting to crank it up. If not, the low pressure fuel pump will run continuously trying to build up enough pressure.

Smallfrye posted 09-03-2002 03:16 PM ET (US)     Profile for Smallfrye  Send Email to Smallfrye     
Be aware the low oil alarm is also connected to a sensor in the oil pump itself. If the coupler or main gear, both of which are nylon, break the oil pump fails and the alarm is tripped.
These nylon parts are easily damaged by over reving the engine. This uswally happens when the prop breaks the water surface and impacts upon re entry. Don't be fooled when the alarm sounds, the oil reserve is full and assume the sensor is the only thing damaged. You will run about 10 minutes w/o oil injection.

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