Engine won’t turn

Discussion in 'Boating Discussion' started by maurice escobedo, Jun 12, 2018.

  1. maurice escobedo

    maurice escobedo Counselor

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    Esteban
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    sooooo, I get home from working out of town for a few months
    , head out to the boat to give it a start and check her out to start getting her ready for a trip. Maintenance etc. Well, engine won’t turn and I mean won’t turn at all. Removed the starter to try and turn it from the flywheel and still nothing. Seems seized and I don’t understand how or why. Boat turned over fine prior to my leaving. I was having a fuel dilivery issue but that’s it.
    Any ideas?
    Thanks in advance
     
  2. tuner

    tuner pysgotwyr

    Location:
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    Steve
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    Pull the spark plugs and check for water. You may have an exhaust manifold or head gasket leak. The cylinder walls can rust and seize the pistons in a short time.
     
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  3. Capt.C.Delany

    Capt.C.Delany Club a Sea Lion, not a Sandwich.

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    X2
     
  4. gearshifter

    gearshifter Well-Known "Member"

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  5. maurice escobedo

    maurice escobedo Counselor

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    Esteban
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    Thanks guys awesome
    It’s been sitting all winter as I’ve been working out of town. Such a drag.
     
    Last edited: Jun 12, 2018
  6. karlow

    karlow Twins 2017

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    karl
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    I would guess the number one failure mode of I/O engines is exhust system failure. Pull all the plugs and inspect them for rust.
     
    maurice escobedo likes this.
  7. InDeepShip

    InDeepShip Ah ship

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    Adam
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    It's either water in the cylinder or a seized piston. Hopefully it's the cheaper version of those two
     
  8. plj46

    plj46 I've posted enough I should edit this section

    Location:
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    jim
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    What motor ?
     
  9. MATTANZA

    MATTANZA old man of the sea, in training.

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    maybe your neutral safety switch or dead man switch.
     
  10. maurice escobedo

    maurice escobedo Counselor

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    It’s a 350.
     
  11. maurice escobedo

    maurice escobedo Counselor

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    Tried rotating it the flywheel and nada.
    I’ll pull plugs and inspect.
    Thanks all.
     
  12. socaldieseltech

    socaldieseltech Well-Known "Member"

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    If it's completely seized might as well pull it out. Time for a new bullet
     
  13. SilentViper

    SilentViper Newbie

    Location:
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    Jimmy McGinness
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    Had this happen to my 305 after just 3 weeks of sitting about 2 months ago.

    To free up the motor I "soaked down" all the cylinders with Marvels Mystery Oil for a day. Pull the plugs and look for water/rust to get an idea of which cylinders to focus on cleaning/flushing with MMO. The next day I pulled the water pump and pulley off the harmonic balancer, threaded 3 3/8"-24tpi grade 8 bolts into those water pump holes, and put a 4' crow bar on those bolts and slowly worked the motor free. Mine initially moved maybe 10 degrees the wrong way first. Slowly working it back and forth whichever way you can get a purchase on it to make it move. Once it was making full turns without getting stuck I tried the starter to let it flush all the remaining MMO out of the cylinders and kept re-spraying and reflushing until the MMO was coming back out clean. Once it's free and turning off the starter change the oil, find and fix the water leak, mine was the gasket between the exhaust manifold and the elbow, and i've not had a problem since.

    This whole process took about 6-8 hours of hard pulling, yanking, standing on the crow bar, if you can't physically do it, ask your auto mechanic if they have anyone who can get a small block chevy freed up. My truck mechanic shop was willing to if i drug the boat over, said they free up SBCs all the time.

    Good luck
     
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  14. 2454 big mike

    2454 big mike Well-Known "Member"

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  15. maurice escobedo

    maurice escobedo Counselor

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    Thanks a million jimmy. That’s the Father’s Day project instead of a Father’s Day fishing trip. Lol. Funny but not funny.
    That’ll you everyone for tour responses.
     
  16. Aggro

    Aggro Keepin my pimp hand strong!

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    AGGRO
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    Yep, Marvel oil after pulling the plugs. Not fun.
     

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