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  1. M

    New rebuilt OMC 3.0l Overcooling no matter what!

    The housing is older but if anything just rusty not corroded. I also noticed the thermostats have a small open area to bleed some water through, but its very small in comparison to the bleed hole in the housing.
  2. M

    New rebuilt OMC 3.0l Overcooling no matter what!

  3. M

    New rebuilt OMC 3.0l Overcooling no matter what!

    Yes there are only 3 hoses, #1 sea water in top left of thermostat housing, #2 large u shaped hose to pump, and #3 a short jumper hose from right side of thermostat housing to manifold. I am aware of the bypass hole in the housing and it is clear theres plenty of cold water going to the manifold.
  4. M

    New rebuilt OMC 3.0l Overcooling no matter what!

    Yes it happens on the muffs as well. I attempted to warm up the engine to set initial timing and adjust carburetor. It would not come up to operating temperature on muffs, so it has been at the lake since with the same issues. NOTE: I dont remember much water coming out of the prop area while...
  5. M

    New rebuilt OMC 3.0l Overcooling no matter what!

    I will try runing a bore scope thru the exhaust to check for blockages.
  6. M

    New rebuilt OMC 3.0l Overcooling no matter what!

    They open at exactly 175 degrees that seems a little high. I tested the old one and the new one.
  7. M

    New rebuilt OMC 3.0l Overcooling no matter what!

    Hello all, need help with a 3.0l OMC sterndrive in a 28' Harris pontoon boat. Long time reader first time poster :) Compression at 120 across the board. Rebuilt engine (bought from retailer not self done), new manifold, new thermostat (3x, one $40 dollar mercruiser model), All new gaskets and...
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