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496 mercruiser wont crank over

Old 05-16-2022, 07:57 PM
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Default 496 mercruiser wont crank over

i have went through the normal steps of trying to crank my engine over. does anyone have any idea on why a motor would lock up after shutting it off?
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Old 05-16-2022, 08:34 PM
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Is starter power?

Did you pull the plugs to see if water is in cylinders? Check oil for water?
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Old 05-16-2022, 08:44 PM
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I did. no moisture/water on any plugs, no moisture/water in the oil. I changed batteries and then put a new starter on it. crossed the solenoid to make sure the starter was engaging, and still will not turn over the engine. i took the belt off to make sure none of the pulleys was causing an issue. it will still not crank over. i was going to put a breakover bar and socket on the harmonic balance but the bolt is rusted so much as to not have shoulders that a socket would go on. I am just wondering if there is anybody that has ever seen a situation like this. motor was running fine, docked boat, came back 2 weeks later and it would not crank over. then i started all the previous test.
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Old 05-17-2022, 06:52 AM
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pull plugs and try to turn crank, Other than that, Pull outdrive, maybe locked up?
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Old 05-17-2022, 07:18 AM
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Originally Posted by PA.WOODCHUCK View Post
pull plugs and try to turn crank, Other than that, Pull outdrive, maybe locked up?
yup, possibly outdrive. happened to diff family members few years ago. Few people on this board too.
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Old 05-17-2022, 08:56 AM
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. i was going to put a breakover bar and socket on the harmonic balance but the bolt is rusted so much as to not have shoulders that a socket would go on.


If the balancer bolt is rusted away, I can only imagine what condition the rest of the engine is in. It probably has a ground wire corroded away or something along those lines.

Last edited by snapmorgan; 05-17-2022 at 08:59 AM.
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Old 05-24-2022, 06:22 PM
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if you have cool fuel modules, you could have a stuck open injector filling cylinder with fuel causing hydro lock condition
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