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  1. #1

    STX-15F Crack in head?

    Hey all,

    My hull filled with water and sucked it in the engine - hydrolocked maybe? I pulled the plugs and there was water in there. Anyway got the water out and started it again. Ran fine for 20 minutes and then stalled... water in cylinder 3. Dried out and again water in cylinder 3. Pulled the motor and head. Head gasket looks ok. No apparent piston/cylinder/valve damage. Can't see any visual damage. I'm thinking the only way water is getting in is through a crack somewhere inside the head. Is there any other possible way? How can you check for cracks in the head?

    thanks


  2. #2
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    Unlikely but not impossible. Did you drain the intake manifold, have you checked for leaks in the exhaust?

    Sean

  3. #3
    Hey Sean,

    Thanks for your response. I did drain the manifold. Exhaust never even occur to me - if there is a leak, how would water get past the exhaust pressure to the cylinder? I'll check it out though.

    thanks,
    Mark

  4. #4
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    If the exhaust leaks water odds are it also leaks exhaust which stalls the engine, then when you try and restart it sucks the water back up.

    Sean

  5. #5
    Hey Sean,

    I checked the exhaust manifold and pipes and could see any cracks or apparent damage. What would be the next step - is there a way to xray the exhaust and/or head? Really stumped on this one.

    thanks,
    Mark

  6. #6
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    Did you remove the pipes or just look at them?

    Sean

  7. #7
    Pulled the manifold and disconnected the pipe to it and checked them over carefully - they looked fine. Other exhaust pieces still in the ski.

    I should mention that before I pulled it all apart, I did try running it on the trailer with the hose and cylinder 3 took on water right away.

    thanks,
    Mark

  8. #8
    This project has been on hold for a bit especially since the head and the ski are 200 miles apart.
    Still stumped but when I do put it back together can I reuse the same head gasket and/or manifold gaskets?
    I know the easy answer is yes but if I have to take it apart again it starts to add up to keep using new gaskets.
    I attached so pics of the head gasket. Does it look ok?Click image for larger version. 

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  9. #9
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    Replace the head gasket if there is any doubt. Replace the intake manifold gasket.

    Sean

  10. #10
    well back at er this morning. looked at the manifold and pipe. They look in great condition and no signs of water in themClick image for larger version. 

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