150 Optimax

Discussion in 'Boats, Motors, Trailers and Towing Rigs Forum' started by Gypseas, Jan 4, 2009.

  1. Gypseas

    Gypseas Active Member

    Got out a few days ago just to come around the Wiffin Spit and find it too rough in the open.
    So I was taking it easy on the throttle say around 2000-3000rpm you know trying to keep it on the plane without slamming too hard. The outboard temp got too high to the point where it would not rev up higher than 2000rpm. High temp alarm came on and when checking the temp found it at 89deg Celsius.
    Is has happened before, took it at the Mercury Marine they changed the water pump, checked the thermostat all looked clean they said no problem.
    Anyone out there with the same problem? When at cruising speed temp in the motor shows between 29-31 celsius.
    Thanks

    JUST FISHEN'
     
  2. wolf

    wolf Well-Known Member

    Did you hit a chunk of kelp ???and it got wrapped around the intake cooling ports??? AS I have had the temp go up on that before??? cut the corner coming into the basin entrance from that kelp bed that sticks way out.
    how is it now??


    Wolf

    Blue Wolf Charters
    www.bluewolfcharters.com
     
  3. Gypseas

    Gypseas Active Member

    Nope no kelp in the intake just going too slow, not enough water through the motor I guess. Water coming out of the telltale hole was warm not hot by any means.

    It's never done it while running at cruise. Say I come out of the slow zone with a temp of 72°C as soon as I punch the throttle to come on plane the temp will go down to 29°C in a matter of seconds.
    Hows your 225Opti behavin' ? Will it let you troll on it without overheating? When you slow down to park the boat does it start steaming at all?

    Thanks Wolf!


    JUST FISHEN'
     
  4. wolf

    wolf Well-Known Member

    That seems weird to me as it shouldnt matter how fast or slow your going a pump is a pump maybe time for an impeller check????
    As for my engine I think it is great no problems as for the steam you see I think it has to do with the compresser that is on them ????
    I can troll on it if I want but have never had to cause if it that rough out there I dont want to be out there LOL LOL


    Good luck Wolf

    Blue Wolf Charters
    www.bluewolfcharters.com
     
  5. beemer

    beemer Well-Known Member

    could be a bad sensor. What year is the engine? if it is a 2000 or 2001 , they had sensor problems .The sensors have a plastic base that gets cracked and gives a high temp reading putting the engine into "guardian" mode. Try replacing the sensor with a brass based one. let me know how it goes.
     
  6. Charlie

    Charlie Active Member

    Once upon a time and the only time I’ve had that problem: I ran one of my outboards up on the beach and filled the entire water cooling system with sand. I ended up replacing the impeller, then had to go back and clean the water passages - as it ran hot at an idle. I cleaned the water passage first running water backwards through the telltale hole as a friend suggested. Then finally had to take it back apart to clean each line.

    It sounds like it can only be one of these four things (that I know of). And I would check them in the order listed. Impeller, clogged/loose water tube/passages, thermostat, sensors. If you have just changed your impeller make sure you don’t have any salt deposits, sand, mud, or kinks clogging the internal water tubes/passages. Make sure your internal tubes have a good connection and aren’t loose! Check your screens and STRAINER!</u> Just a small amount of salt deposit or sand will make it run hot at an idle. If that doesn’t do it I would change the thermostat (even if it tested good), and then any other associated sensors.

    Oh... just for giggles! Make sure your timming is set right!
     
  7. GLG

    GLG Well-Known Member

  8. wolf

    wolf Well-Known Member

    Charlie you just made me think of something that used to happen !!!!
    It may be a blocked tube as I know there was a problem with the rubber gromet at the engine block restricting the flow You may want to phone either merc or alpine (btw my best friend works at alpine/morrison) tell him I sent you i can give you his number gypseas pm me if you like.

    Good luck Wolf

    Blue Wolf Charters
    www.bluewolfcharters.com
     
  9. Gone Fishen

    Gone Fishen Member

     
  10. Gypseas

    Gypseas Active Member

    Thanks for the help guys!
    The motor is a 2003 with 250hrs and under warranty until 2010 (long story;))
    Had a new pump impeller installed a year and a half ago and last service at the Merc Marine they said thermostat was pulled and all looked spic an span no problems. 380 bucks later that is [8)]
    GLG done some reading and found this

    Guess next service I'll have to pound at it again.
    Cheers!


    JUST FISHEN'
     
  11. Charlie

    Charlie Active Member

    Check your STRAINER!</u>

    Water is fed by a small tube that has this little strainer on it where it goes into the powerhead. I am think'n that will solve your problem! :)
     
  12. Fishallspec

    Fishallspec Member

    Your problem is not an uncommon one!! There are a couple of fixes for this witch include changing a small bypass hose from 5/16" to 3/8"( now I cannot be sure what one it was ).My 2001 did it 2 times in the 150 hours that I owned it and it is a known problem at around 2000RPM cruise the alarm will sound off. Wolfs guy should be able to point you in the correct direction. Don't let the dealers keep saying "It needs a new pump or impeller" It needs to be corrected! I am pretty sure if you go to "continuous wave" Boston Whaler site discussion forums and do a search you will read like I did about the problem. Good luck!
     
  13. Gypseas

    Gypseas Active Member

    Will check that strainer next time the boat comes home.
    What bypass hose would that be Fishallspec? With the motor still under warranty I wouldn't want to mess it up on my own :D

    cheers

    JUST FISHEN'
     
  14. mlaag

    mlaag Member

    Hey Gypseas
    I think it is time to get a !!!! bigger !!!!! boat with a deccent motor
     
  15. mlaag

    mlaag Member

    Hey Gypseas
    I think it is time to get a !!!! bigger !!!!! boat with a deccent motor
     
  16. Gypseas

    Gypseas Active Member

  17. Gypseas

    Gypseas Active Member

  18. Rockfish

    Rockfish Well-Known Member

    When you say they checked the thermostat what does that mean? I know you can test them in water that is then heated till they open and check the opening temperature with a thermometer but don't really see the point. Just visually inspecting them will not tell you much and if you have gone to the trouble of pulling them out why not replace em. My 225 Opti has only once thrown an overheat alarm and that was kelp fronds blocking the intake ports. The temperature should be stable throughout the rpm range, - mine is.
     
  19. Sr SQ

    Sr SQ Well-Known Member

    8 yr old thread rockfish....
     
  20. gunnerlove

    gunnerlove Active Member

    And the answer would have been give it more throttle and get the popet valve to open.
     

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