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Recent content by MrJanx

  1. M

    Mercruiser 5.0 cooling hose swelling into serpentine belt

    Fixed!!, mechanic found blades from sea water pump lodged in cooling hoses. pressure normal and cooling temp normal
  2. M

    Mercruiser 5.0 cooling hose swelling into serpentine belt

    But then I heard from previous mechanic that whole sea water pump was changed 20 hours ago
  3. M

    Mercruiser 5.0 cooling hose swelling into serpentine belt

    Just found this in another thread from someone with same issue: Your issue is in the bypass tee located under the thermostat housing. Remove the oetiker clamps and take a look. Guaranteed to have an impeller blade in it blocking the flow. Causing excessive block pressure. Your circ pump hose is...
  4. M

    Mercruiser 5.0 cooling hose swelling into serpentine belt

    There was more water when I pulled the plug than I would like to see but he also hosed the boat down before I got there to look at it. Looking at the flow diagram it seems odd that water is pulled through that hose to water pump should not build pressure. I hope the extra pressure is not an...
  5. M

    Mercruiser 5.0 cooling hose swelling into serpentine belt

    I did not open the engine compartment to look because I was driving. It looked so clean underneath that I never thought twice.
  6. M

    Mercruiser 5.0 cooling hose swelling into serpentine belt

    Yes, ran great for about 30 min test with seller. 2 days later put it in and within 5 min water was spraying from hose.
  7. M

    Mercruiser 5.0 cooling hose swelling into serpentine belt

    The hose that has swollen twice and got cut is number 4 on the left
  8. M

    Mercruiser 5.0 cooling hose swelling into serpentine belt

    Both, the one that got cut when I had it out could have been old but didn't look bad. New one was put on and did the same thing when boat was put on plane
  9. M

    Mercruiser 5.0 cooling hose swelling into serpentine belt

    They are going to install a mechanical water pressure gauge and verify pressures
  10. M

    Mercruiser 5.0 cooling hose swelling into serpentine belt

    and oddly enough, the engine is running at 140 degrees
  11. M

    Mercruiser 5.0 cooling hose swelling into serpentine belt

    Had the risers and manifolds replaced. When the mechanic took it for a water test the hose swelled again and was cut by belt. This is from the mechanic. We performed the Thermostat service , mended the hose , reinstalled and tested on the river with Dianostics equipment. Unfortunately there...
  12. M

    Mercruiser 5.0 cooling hose swelling into serpentine belt

    I have dry joint risers and manifolds. Is there one brand better than the rest when replacing these or just oem
  13. M

    Mercruiser 5.0 cooling hose swelling into serpentine belt

    I agree
  14. M

    Mercruiser 5.0 cooling hose swelling into serpentine belt

    I'm wondering if just taking off the large elbow at the rear would allow me to see if there is any nonsense inside before I take the whole thing apart.
  15. M

    Mercruiser 5.0 cooling hose swelling into serpentine belt

    Found out these are the original manifolds and risers from 2003. Prior to last year boat was kept inside a boatel and only used once a year.
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