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  1. #1
    Member
    Join Date
    Jan 2016
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    Milledgeville, GA
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    1

    2014 250 Yamaha SHO Knocking Noise

    My 2014 Yamaha 250 SHO started making a knocking noise the other day. We thought it could have been bad gas because it had been sitting in the tank for a while and didn't have that pungnet gas smell. Drained the tank and took it out on the water to test it and it was still knocking. We took it to our mechanic and they ran the motor and they said the low oil pressure alarm started going off. They checked the oil levels and everything seemed fine there. They looked at the ecu recorder and it said that the motors low oil pressure alarm had gone off 30 times since we have gotten the motor. I have not heard the alarm go off at all since I have owned the boat.

    What could be making my motor knock?

    Why haven't I heard the low oil pressure alarm?

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  3. Member
    Join Date
    Feb 2015
    Location
    Columbia SC
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    2,448
    #2
    Go see how loose your flywheel is

  4. Member SkeeterDD22's Avatar
    Join Date
    Dec 2007
    Location
    Lamar, AR
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    30,267
    #3
    If the knocking is related to low oil pressure (and most likely it is from what you've said)......It'll need teardown attention (rebuilt or new block).

  5. Member
    Join Date
    Apr 2009
    Location
    Roanoke Rapids, NC
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    2,400
    #4
    Did they tell you in what time frame the alarm went off 30 times. 30 in the last ten minutes or over the past year? I wonder if you can tell the difference from the readout?.

    And was it still knocking when the mechanic ran it. All I saw was you said he saw low oil pressure

  6. Member
    Join Date
    May 2012
    Location
    New Iberia, Louisiana
    Posts
    394
    #5
    Typically everything is lies or misdirection! First understand, what a "knock" is. Then proceed slowly. remove gearcase drain plug and examine "debris" on magnet. Remove oil filter and cut open, examine for "debris". If unit is under warranty, don't touch!! Bring to a Dealer. ThanksMartin

  7. Member
    Join Date
    Jan 2010
    Location
    Port Neches,Tx
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    10,569
    #6
    My HPDI computer says I've had a couple hundred overheats. The engine has never been hot.

  8. Member SkeeterDD22's Avatar
    Join Date
    Dec 2007
    Location
    Lamar, AR
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    30,267
    #7
    If it was under warranty, I'd charge my trolling motor batteries and head to the lake. That'd tell if it was something, or nothing.

  9. Member
    Join Date
    Nov 2013
    Location
    Illinois
    Posts
    558
    #8
    if you have analog gauges that are not yamaha it will show over heat every time you start it

  10. Member
    Join Date
    Aug 2012
    Location
    Rutledge, TN
    Posts
    134
    #9
    On my 14 250 SHO the only time my low oil pressure alarm came on was about .3 seconds beofre she started knocking like a diesel engine on ether.Needless to say a new power head had to be installed. This was at the 130 hr mark.

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