[Question] 455 Olds with Berkeley Jet, oil leak
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455 Olds with Berkeley Jet, oil leak

  1. #1
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    Default 455 Olds with Berkeley Jet, oil leak

    I have a 455 Apollo Jet Boat. The motor is strong and has no issues except that it leaks oil but the only after it has been run. Meaning I cannot see/find any leaks while the boat is in use, no matter how long I run it for. In addition, the leaking has never, after dozens of tests occurred during a dry land test.

    The oil only appears the day after I use the boat on the water and then it is about a cup full of oil. It is very strange and has been going on for some time, like 5 seasons.

    Does anyone have any ideas. I am thinking it is a weeping rear main but sometimes its does not leak at all...even after a long day on a lake.

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    Member Howard250's Avatar
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    I had a oil leak on a 496 that would not leak while sitting. Ended up that the oil pan had a hair line crack near the rear main and would only leak after the engine was warmed up.

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    Boat Nut sleekcrafter's Avatar
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    spider cracks on the bottom of the oil pan....
    Upper Midwest Power Boat Association
    DRAG BOAT RACING UMPBA #926


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  6. #4
    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by max66bhs View Post
    I have a 455 Apollo Jet Boat. The motor is strong and has no issues except that it leaks oil but the only after it has been run. Meaning I cannot see/find any leaks while the boat is in use, no matter how long I run it for. In addition, the leaking has never, after dozens of tests occurred during a dry land test.

    The oil only appears the day after I use the boat on the water and then it is about a cup full of oil. It is very strange and has been going on for some time, like 5 seasons.

    Does anyone have any ideas. I am thinking it is a weeping rear main but sometimes its does not leak at all...even after a long day on a lake.
    Over and above crankcase excess pressure from loose or worn clearances, poor crankcase ventilation and because of basic inherent engine design and oiling system characteristics these engine can blow oil out of the best sealed "cracks", gasket joints,crevices, breathers etc on moderate long hard sustained runs or with excess or uncontrolled crankcase pressure, lots of simple fixes

    hers but one ...

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