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  1. M

    2002 5,7 Mercruiser exhaust manifold keeps cracking - 5 times this summer

    My boat mufflers and exhaust outlets are looking like this, so sudden stopping is not bringing wave to the engine. I will be checking the whole waterflow in and out on that side of the engine - can also compare to starboard side, if there is any differencies.
  2. M

    2002 5,7 Mercruiser exhaust manifold keeps cracking - 5 times this summer

    Risers and elbows are not original, when I got the boat, all risers and elbows were changed to new better ones. Cylinder heads went to the shop and were checked and refurbished - no issues there. Engine oil this 5th time is still clear as engine was stopped before it was filled with water, all...
  3. M

    2002 5,7 Mercruiser exhaust manifold keeps cracking - 5 times this summer

    We assume that it is linked to the water flow thru the exhaust, just can not find the issue, last time engine and all the piping was outside the boat and we did not see any issues (to be frank - we also did not look any closer on piping) SeaRay mufflers are rather big bulky ones and there is...
  4. M

    2002 5,7 Mercruiser exhaust manifold keeps cracking - 5 times this summer

    Winter maintenance was done in the boat and last renovations I was the delivery guy to and from the garage - engine is mine :)
  5. M

    2002 5,7 Mercruiser exhaust manifold keeps cracking - 5 times this summer

    My setup looks very similar to the drawing attached - will go over it pipe by pipe once in the boat. Thanks! Cyclops - Searay has rather big mufflers and it is not the issue with fast stopping, I am sure I have the issue with water flow around this one exhaust manifold - it started after the...
  6. M

    2002 5,7 Mercruiser exhaust manifold keeps cracking - 5 times this summer

    Hi I have sea water cooling and I do not know the serial number of the engine. While driving all numbers are fine on numbers, water pressure, water temp, oil pressure etc. Water coming out from the sides of the boats are normal temp, if the manifold would get really hot, it should burn the paint...
  7. M

    2002 5,7 Mercruiser exhaust manifold keeps cracking - 5 times this summer

    Hello everyone! I need help diagnosing the issue I have been fixing 4 times this summer, without much success sadly! After doing proper maintenance last winter and taking the engine off for small oil leak fix, I have had a 5 exhaust manifold cracks on port side engine and port side manifold...
  8. M

    2003 Mercruiser 6.2 MPI Exhaust Manifold cracks

    I have now reached to the point where I have replaced manifolds four times and each time I hoped that I found the reason for it.. Firstly I blamed old age of the engine and put new manifold, after 2 hours of driving, another crack, then changed the provider .... and after another crack also...
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