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Was it a std crank or a cut crank.
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Originally Posted by ctuck0659
(Post 4514345)
So I get that sending some oil through the bypass un-cooled will raise the overall temp of the oil as measured by the thermostats located at then end of the first remote oil line, but the highest temp was never in excess of 260 deg, usually closer to 220 (except for 3 or 4 times for short periods before I changed the coolers). That means oil temp was not an issue and I still say that recycling unfiltered oil through a new engine for 90 hrs will not destroy a set of main bearings. I'm well aware that marine engines are different animals than car engines, but as a reality check: 90 hrs X 50mph = 4500 miles.
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if this engine went 90 hours i doubt the bypass valve is the cause.
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Originally Posted by 14 apache
(Post 4514348)
My point is that cheap and small filters collapse inside shutting off oil flow and go into bypass mode and then you die.
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When the oil was running hot did the engines ever lose oil pressure? If it is only the #1 brg it could indicate low oil pressure. just a guess!
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Both were factory new Scat cranks.
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Engine shop by me will do a motor come back blown up he asks for the oil filter and it's collapsed in a few hundred miles.
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Originally Posted by abones
(Post 4514364)
When the oil was running hot did the engines ever lose oil pressure? If it is only the #1 brg it could indicate low oil pressure. just a guess!
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Originally Posted by ctuck0659
(Post 4514362)
No argument. But in this case neither filter are in the "cheap' category and even if they were, I believe that it would take something on the order of at least a couple hundred hours of completely unfiltered and unchanged oil to trash the bearings. In this case even assuming the bypass valves opened, the the oil was at least partially filtered and was changed very frequently. These reply's have given me a few ideas to explore, which I appreciate, but I still don't think I know what caused this. I don't expect that the answer will be solved by discussing it with a limited amount of info and no photos but your suggestions at least give me ideas to think about. Thanks-
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i overly rich condition can wipe out bearings in a hurry.
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