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NorcalSparky71

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71 Tahiti 455 water in the Oil after really rough water
« on: October 03, 2020, 09:27:45 PM »
I've got a 71 Tahiti Torino with a Hardin Marine 455, Berkeley jet , and through transom exhaust all original setup. I've had this boat for the past 20yrs and its performed flawlessly. Its pretty much just a lake boat, but once or twice a year I put it in salt water as we literally a thousand yards from the bay.
      I took it out in the bay last weekend and ended up getting caught in some extremely rough water that really knocked the boat around. When I got home and opened the engine cover to get ready to flush the block there was milky oil all over the right side of the engine and on the bottom of the engine cover directly above the oil filler neck. Pulled the dipstick and nothing but chocolate milk.
      Its seems this beating the boat took must have something to do with the water in the oil, as this has never been an issue before.
Has anybody had this happen, is there another way for water to get in the oil other than a blown gasket or cracked head?
The engine fires up and runs perfectly fine, don't see any obvious leaks when running it with the hose connected.
Any advice would be greatly appreciated.
Thank you
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Roadrunner

  • Karma: +13/-0
Re: 71 Tahiti 455 water in the Oil after really rough water
« Reply #1 on: October 04, 2020, 11:39:36 AM »
There are a lot of possibilities of how water mixed with your oil. Sounds like that motor has never been broken open. Maybe some of the gaskets finally let loose. The weak spots on that engine are 1: the intake manifold to head seal. And 2: the water pump cover/timing cover.  My money would be on the water pump plate to timing cover gaskets/seal. Those are very problematic for that motor. I would suggest spending the winter to inspect everything and re-gasket it all. Might not be a bad idea to freshen up the rings and bearings. 20 years, you definitely got your money’s worth. Time to give her some love. As far the oil everywhere, with sustained higher rpm’s, the valve covers fill up with oil until oil squirts out the top of the valve cover breather. It’s a common issue with that motor due to a poor drain back design. Adding a catch can will help keep your engine bay clean when that happens. Good luck
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