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  1. #1

    Default Hydrolocked in the parkinglot

    Weird ting but yesterday I spent all day working to finish my two 2-stroke waverunners and only around 10pm I decided to go to my 1997 Maxum 5.7L to just start it and clean it a bit for the next morning.
    To my surprise the engine would try to crank and lock up. I thought it was the battery being low. So enabled the dual charger and waited, tried again and same thing. I opened up the engine area at the transom and under the engine there was a lot of black, nasty water touching the engine, and of course the drain screw was on(my bad). I remember after going fishing a few month back, before Covid, I pressure washed the floor and never thought I had the drain blocked(brain fart). So I cleaned up the engine compartment and tried again, no luck the starter sounded like it wasn't engaging(wasn't a click, click sound) weird sound as if it was free spinning and not touching the flywheel. So my friend suggested that it may be hydro locked.
    I said how the heck I started it a month before when I did the pressure spraying. I did have water running at the engine.
    So how the heck did I get the water to stay in the cylinders, yes I took off all 8 plugs and spun the engine from the main pulley and water rushed right out not from all but both sides.
    I read about the risers getting rusted being cast iron, manifolds to go with, some said something about the risers being too low sometimes, but only if coming to a quick stop on water and engine overheated it could cause water to get in. Not my case here, never had that problem, and only the last trip was on salt water. Ran a hose with fresh water for 20min right afterwards.
    The starter turned out to have the plastic cup with the planetary gears completely worn out. Maybe from the hydro lock.
    By the way the oil doesn't look contaminated but I will change it with the filter.
    What else should I do, should I see if the heads are bad, read about unplugging a hose and filling with water till morning to see if t leaks inside the motor.
    Sorry for the long plot but wanted to fully explain.

  2. #2
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    Default Re: Hydrolocked in the parkinglot

    So now it has been sitting for a month with water in the bores. Hoping for the best, but this may have killed it. I would want to borescope those cylinders to see if they rusted up.
    Practicing the ancient art of ren-ching

  3. #3
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    Default Re: Hydrolocked in the parkinglot

    Also sounds like you broke the starter and/or ripped the teeth off the ring gear on the flywheel.
    Chris
    Dockside Marine Services
    Jersey Shore.
    Mercruiser/Mercury Certified
    Let the insanity begin.

  4. #4
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    Default Re: Hydrolocked in the parkinglot

    Get a hook!

    Sorry.

    Jeff

  5. #5
    Join Date
    Mar 2009
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    Portland, Oregon,
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    12,197

    Default Re: Hydrolocked in the parkinglot

    ............
    Quote Originally Posted by gica69 View Post
    ................... no luck the starter sounded like it wasn't engaging(wasn't a click, click sound) weird sound as if it was free spinning and not touching the flywheel.
    If a new starter motor did not cure this:

    .... Remove the starter motor.
    .... Have a helper roll the engine over by hand while you inspect the entire circumference of the flywheel ring gear.


    So my friend suggested that it may be hydro locked.
    I said how the heck I started it a month before when I did the pressure spraying. I did have water running at the engine.
    To do this safely, you will want to turn the water supply ON just as the engine is being started.
    As you prepare to shut down, turn the water supply OFF just prior to shut down.

    I read about the risers getting rusted being cast iron, manifolds to go with, some said something about the risers being too low sometimes, but only if coming to a quick stop on water and engine overheated it could cause water to get in. Not my case here, never had that problem, and only the last trip was on salt water. Ran a hose with fresh water for 20min right afterwards.

    The starter turned out to have the plastic cup with the planetary gears completely worn out.
    I dislike those starter motors that incorporate the reduction system with a nylon ring gear. They almost always fail prematurely.
    Hopefully the nylon ring gear failed before enough torque could "rip the teeth off the ring gear on the flywheel".

    I'd suggest that you try to find a replacement starter motor that incorporates all steel reduction gears.



    By the way the oil doesn't look contaminated but I will change it with the filter.
    What else should I do,
    If you suspect the exhaust elbows, I would remove them and have them pressure tested.... or better yet, replace them.

    should I see if the heads are bad, read about unplugging a hose and filling with water till morning to see if t leaks inside the motor.
    I would not suggest doing that.

    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP drives

    "Intellectual growth should commence at birth and cease only at death." Albert Einstein

    Please... no PMs! Post your questions on the forum.

  6. #6
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    Default Re: Hydrolocked in the parkinglot

    The purpose of the plastic parts on the starter is to protect the ring gear. I would put back on what Mercruiser put on. I think their engineering expertise trumps this guy's ^.
    Last edited by o2batsea; 08-06-2020 at 11:52 AM.
    Practicing the ancient art of ren-ching

  7. #7
    Join Date
    Mar 2009
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    12,197

    Default Re: Hydrolocked in the parkinglot

    ...........
    The purpose of the plastic parts on the starter is to protect the ring gear.
    The real purpose of the nylon planetary reduction "ring gear" is to cut production costs.

    I would put back on what Mercruiser put on.
    If that includes a starter motor that incorporates a nylon planetary ring gear, that would not be advisable.

    I think their engineering expertise trumps this guy's ^.

    Perhaps then this can be easily explained.

    Click image for larger version. 

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    Last edited by RicardoMarine; 08-06-2020 at 12:21 PM.
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP drives

    "Intellectual growth should commence at birth and cease only at death." Albert Einstein

    Please... no PMs! Post your questions on the forum.

  8. #8
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    Default Re: Hydrolocked in the parkinglot

    As usual, Rick thinks the Mercruiser engineering staff are morons, and that he knows better. I'm sure that his personally-approved line of marine starters are the best on earth. Where do we go to buy them Rick?
    Practicing the ancient art of ren-ching

  9. #9

    Default Re: Hydrolocked in the parkinglot

    What's with the doom and gloom guys, you remind me of CNN!!
    The water is no longer in the cylinders. I turned it by hand water came out and I squirted oil in the chambers. The starter plastic piece was destroyed but the flywheel is fine.
    The cylinders are fine, but the water got in there somehow and wanted to know how to test if the heads are bad or the risers and manifold. I know about the rust so no need to point out. And why is typing so f'ed when replying?
    Last edited by gica69; 08-07-2020 at 03:07 AM. Reason: missed some things

  10. #10
    Join Date
    Mar 2009
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    12,197

    Default Re: Hydrolocked in the parkinglot

    .............
    Quote Originally Posted by gica69 View Post
    What's with the doom and gloom guys, you remind me of CNN!!
    Had you been a long time member here, you'd see that it's more like Dan Ackroid and Jane Curtain doing their version of Point/Counter-Point on the old Saturday Night Live.



    The water is no longer in the cylinders. I turned it by hand water came out and I squirted oil in the chambers.
    The starter plastic piece was destroyed but the flywheel is fine.
    Good to hear that!

    The cylinders are fine, but the water got in there somehow
    It would be best if you would start the engine up and blast any remaining water out of the cylinders, even if only for 10/20 seconds.

    and wanted to know how to test if the heads are bad or the risers and manifold.
    A cylinder leak-down test will help reveal what or where the problem is.
    Risers/Spacers are generally not suspects, but manifolds and elbows should be on the list.


    I know about the rust so no need to point out.

    And why is typing so f'ed when replying?
    Not following you on that one!
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP drives

    "Intellectual growth should commence at birth and cease only at death." Albert Einstein

    Please... no PMs! Post your questions on the forum.

  11. #11
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    Sep 2008
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    8,466

    Default Re: Hydrolocked in the parkinglot

    On the typing a reply....this is what I found helps to mitigate the issue:

    In the quick reply box, click the top LH button (popup shows "Switch Editor to Source Mode" when you hover over it). The button will get highlighted (turned on) and text entry should go back to normal....

  12. #12

    Default Re: Hydrolocked in the parkinglot

    So I did the compression test and they are all between 160 and 170. Only one at 170 the rest 160 and 165.
    I went online to look at the 2 barrel 5.7L mercruiser carburetor rebuild and I noticed that my choke plate doesn't stay all the way closed upon starting and opens in 2 minutes, it moves freely by hand like it is not attached anywhere. so before I go ahead and take out the risers one by one to inspect for blockage I would like to get the 650rpm idle back.

  13. #13

    Default Re: Hydrolocked in the parkinglot

    So I took the port riser, elbow and manifold out. There is rust but not complete blockage. Will dip it in some CLR cleaner and hopefully will clean most of it out. The rest just brush it.
    I want to clean the carb off any dirt, should I just rebuild it or clean it?
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  14. #14

    Default Re: Hydrolocked in the parkinglot

    More pics
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  15. #15

    Default Re: Hydrolocked in the parkinglot

    And more stuff
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  16. #16
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    Default Re: Hydrolocked in the parkinglot

    Well I guess if it turns easily and the compression numbers look OK, which they do...then go with it. The best thing for the engine is to use it. But do a couple oil changes maybe every 20 hours or so just to be on the safe side.
    When it comes to marine parts, when in doubt, throw it out.
    I mean, really, ask yourself if you're worth spending the half stack on new manifolds. They gotta be replaced at some point anyway so whatever you do to de rust them is only delaying the inevitable.
    If you wanna go to the trouble, there are stainless elbows out there that will fit and won't rot.
    Practicing the ancient art of ren-ching

  17. #17

    Default Re: Hydrolocked in the parkinglot

    I was asked on TheHullTruth forum about flappers on the Y pipe. I don't think there are any. can they be installed now or do they come with it?
    By the way this boat has less than 80 hours on it only fresh water plus one salt.
    I still have to figure out where the water in the cylinders came from. Mystery of the year.

  18. #18

    Default Re: Hydrolocked in the parkinglot

    How we’re all the cylinders filled with water but there was none in the base?

  19. #19

    Default Re: Hydrolocked in the parkinglot

    That's the hundred dollar question. I don't know, like I said the boat got hydro locked sitting, I started it a month before and it was fine. After, I think we had some heavy rains but there is a small cover over the flame arrester. Maybe it went through. I found water in the bilge area, went up to the oil filter inch up on it.

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