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  1. M

    Overheating and hydro locked

    Alright I did the coolant system pressure test and it holds at 20psi no problem, at this point I’m thinking install the new riser gaskets and see if it’s solved , probably all that was ever wrong but just seemed like too much water for a failed gasket, hopefully this is the fix . I appreciate...
  2. M

    Overheating and hydro locked

    Alright I’m guilty of going down the rabbit hole and getting lost in the what if’s and what could be. But my problem seems a lot like water reversion , whereby the valve lap is pulling water like a vacuum back into the motor. It’s typically on big blocks and at times on sbc but most often seems...
  3. M

    Overheating and hydro locked

    Acetone test on manifold showed no leaks as well
  4. M

    Overheating and hydro locked

    Thank you for all the replies, so I did my leak down test and Center cylinders on port side leak down about 10psi at 50 . Can’t hear or identify where the air is going other than back out the spark plug hole as the insert is only hand tight. You mentioned a leak down test on cooling channels is...
  5. M

    Overheating and hydro locked

    Just did a compression test basically even across all cylinders at around 150psi , not sure if that rules out head gasket or head issues but I’m optimistic. Next step is acetone testing my exhaust manifold , is there a way to test riser?
  6. M

    Overheating and hydro locked

    Ok so my next question is what would allow the motor to pump water into cylinders when turning it over , almost like the pistons are acting like pumps and causing vacuum and bringing water in , is that possible ? Exhaust fills with water due to suction from pistons?
  7. M

    Overheating and hydro locked

    I’ve been using it all year , I think my thermostat packed it in, and overheated the boat , that’s where this all started , overheated and I turned it off then tried to start again and it was hydro locked . Changed thermostat and ran it for 45 mins in the driveway And thought alll was well in...
  8. M

    Overheating and hydro locked

    Thank you, my thermostat wasn’t allowing the raw water to circulate , thus the overheating . But if that wasn’t the likely cause I’m all ears. As for the water into the cylinders only when in the lake not when on muffs , you think intake or head gasket? Literally like a pump with the amount of...
  9. M

    Overheating and hydro locked

    Hello everyone , my motor overheated from a bad thermostat and hydro locked , I replaced the thermostat and it ran normal with muffs on but when I put it in the lake , it hydro locked again, I pulled the plugs while on the lake and cranked it over and water was pumping out of the cylinders like...
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