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Thread: 2005 Optimax 115

  1. #1
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    Default 2005 Optimax 115

    Motor cranks very easy. Idles well. Pumping loads of water. But when it hits 4100 rpm an alarm starts sounding. At this rpm I am running 35-36 mph. If I push throttle open more it will pick up speed but alarm starts squeeling. It will do it with motor trimmed up or down. Still runs great just the alarm. Water pump is putting out full stream from pee hole. Any ideas?

  2. #2
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    Is it a steady alarm ?

  3. #3
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    Yes it is. But only comes on at 4100 or above.

  4. #4
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    If steady alarm it's either water temp
    warning or fuel restriction alarm, if temp warning try unplugging temp. sensor , some had 2 some had 3, but u need to make sure motor is not getting hot , if u have lazer temp. gun. If motor is not hot, sensors are known to go bad, by unplugging one at the time will tell u which one. Some of those models had fuel restriction alarm , motor has air compressor that pushes fuel at injectors , u can hear it at idle , sounds like a sewing machine. If intermittent alarm, make sure on board oil tank cap is on tight that tank has a alarm, that is a pressurized tank and pressure pushes oil to motor tank ,both have alarms , if caps are tight on tanks , and oil in both ( make sure u have oil in motor tank) if not , cap or caps on in board tank could bee leaking or pulse line from engine has a leak. If u have oil in both with caps tight , unplug 2 wires at in board tank and see, if that doesn't work unplug 2 wires at motor tank. Those floats can go bad
    Likes crappiemax, catchNgrease LIKED above post

  5. #5
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    Thanks a bunch . Will try those suggestions.

  6. #6
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    My oil tank has a bad float and causes intermittent alarms. Disconnected right now but will be replaced later. Mine is an older 40 but the systems can sure be aggravating. Hope it’s just a bad sensor and you can fix it yourself.
    Listen to your gut over all the other voices.

  7. #7
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    My 225 opti did that a couple years ago. It was a bad float in the oil tank on the motor.
    Disconnect the connector on the tank and see if it stops. If so replace tank and fill with oil.

    Sent from my SM-G892A using Tapatalk
    There will be days when the fishing is better than one's most optimistic forecast, others when it is far worse. Either is a gain over just staying home.

  8. #8
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    My guess is thermostat is sticking closed. If the thermostat closes you will still see it pump water it just won't flow around the engine jacket. Replace the thermostat.

    Sent from my E6810 using Crappie.com Fishing mobile app




  9. #9
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    It could be your popet valves are not opening as the engine RPM`s come up they by pass the thermostats.

    I do not think this is your problem but a good thing to know about the Opti`s

    Have you replaced the water pump lately, Mercury recommends max every 2 years, they do not seem to wear out they get hard every time I have had to change mine it looks fine but the impellors are very stiff, the water tell tale never gives any indication of weak water pump.

  10. #10
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    Barnacle Bill is offline Super Mod and 2014 Crappie.com Man of the Year * Crappie.com Supporter
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    Quote Originally Posted by Bricks View Post
    It could be your popet valves are not opening as the engine RPM`s come up they by pass the thermostats.

    I do not think this is your problem but a good thing to know about the Opti`s

    Have you replaced the water pump lately, Mercury recommends max every 2 years, they do not seem to wear out they get hard every time I have had to change mine it looks fine but the impellors are very stiff, the water tell tale never gives any indication of weak water pump.

    Good advice here. That is a symptom of bad poppet valves. And water pumps can be pumping water but not the volume needed.
    Fair Winds and Following Seas

    Bill H. PTC USN Ret
    Chesapeake, Va


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