Motor troubles (locks up— Starter? Oil pump?)
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Motor troubles (locks up— Starter? Oil pump?)

  1. #1
    Senior Member Bigblockbill's Avatar
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    Got a wierd one here and I am stumped. Working in a buddy’s boat this weekend. He bought a bare hull and stuck a 496 and Bravo 1 drive in it that had been sitting around for a while.

    Interesting thing is it will run fine for several mins then slow down then seize. Hit the key and seems pretty well seized. Let cool for a few mins and it’s good to go again. No funny noises. First Thought was water reversion and hydro locking but it happenes even at 2000+ rpm. Plus pulled plugs and no water.

    Any chance the starter is maybe not disengaging from the flywheel and pulling motor down after it heats up? And do so with out making any unusual noises?

    Anything other random thing to think of? Oil pump maybe? Something in the upper half of the drive? Valve stems sticking on guides? Pistons skirt or wrist pins? Spark doing something funny and jumping a cylinder ahead? (Did try different MSD box and coil )

    It’s got great oil pressure, and nothing funny in the oil on the dip stick. The problem pulled the motor down from around a constant 2000 rpm yesterday even. But yet two weeks ago the motor ran for around an hour on the hose and never had it happen.

    Any help or ideas?
    Thanks
    Bill
    Last edited by Bigblockbill; 05-13-2018 at 08:07 PM.
    24' Eliminator Fundeck

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  3. #2
    Senior Member ol guy's Avatar
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    my first question would be is the starter getting so hot you cant touch it. If it is that may point you in the right direction. Also if the engine still has good oil pressure and no heating problems, don't look at the engine locking up but more the starter or drive. Also another question is what gear are you starting in and is it water plumbed in and is it getting out? Mark

  4. #3
    Senior Member Bigblockbill's Avatar
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    Good point just feeling the starter I had not done that yet. The drive is in N and prop not turning. Water is being sucked up the drive and comes out the exhaust. To tell the truth though the fresh water line did get hooked up backwards to the fresh water pump when the boat first got rigged. Not sure how hot anything ever got but the water pump housing and impeller was replaced after that.

    It’s a high torque mini stater, think if it was spinning and not disengaging it would do it quietly or make a lot of noise?
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  6. #4
    Senior Member ol guy's Avatar
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    FWIW. I had a guy I know that had a starter issue that it was never realized the starter was staying in contact with the flywheel all the time running the boat, never heard a sound. Starter took a drastic dump. That's the main reason for check the starter for heat Others are obvious. It sounds like it is not a hydro-lock but another issue. Best way to check it is run it with good water and shut it down, check the starter and try to turn the engine if it is looked up, try to turn it over by hand off the damper bolt. Also listen to the engine if you hear any thing like the starter drive disengaging. ????

  7. #5
    Can't cure stupid 1Homeblown's Avatar
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    I trashed two starter pinion gears before I realized it wasn’t fully disengaging from the flywheel. You really had to listen to hear what it was doing. Mine is a Chrysler so it’s a bit easier to view and install than a BBC. I took a slo-mo video of it to make sure I had good disengagement. Here’s a picture of some carnage too. Ended up having to change flywheels. It needed a different offset to fix the issue.

    https://youtu.be/VvW7HHcIp4o


    Sent from my iPhone using Tapatalk

  8. #6
    Senior Member Bubbletop409's Avatar
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    A starter pinion stuck in the flywheel will self destruct very quickly. A 168 tooth flywheel will spin an 11 tooth starter drive at 30,500+ RPM with the engine loping at 2000. I would be looking elsewhere for the issue.
    Larry

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  9. #7
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    might have cracked exhaust manifolds causing reversion.at a slow idle it cah hydraulic a cylinder.

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