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  1. #1
    fabrication guru rapidacceleration's Avatar
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    massive oil leak on sc 4tec motor

    ive been chasing a major oil leak on my 4tec motor and cant finded it.
    im dumping like 2 quarts in less then 20 minutes??? replaced all gaskets on the front oil pump,seperator,etc and checked the valve cover gasket and still leaking it the motor in the 4tec XPL so its a bit hard to see in there to find it

    Thinking now it might be the pto housing gaskets, or maybe the oil cooler gasket?? not realy sure.
    does anyone have any other sugestions????


  2. #2
    Site Admin Green Hulk's Avatar
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    Daniel, there are two O rings between the oil cooler and the block. I betcha a $100 bill that you are missing one of the O rings.

    This is a very common problem when people remove and reinstall the oil cooler

  3. #3
    Hydrotoys's Avatar
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    Quote Originally Posted by rapidacceleration View Post
    ive been chasing a major oil leak on my 4tec motor and cant finded it.
    im dumping like 2 quarts in less then 20 minutes??? replaced all gaskets on the front oil pump,seperator,etc and checked the valve cover gasket and still leaking it the motor in the 4tec XPL so its a bit hard to see in there to find it

    Thinking now it might be the pto housing gaskets, or maybe the oil cooler gasket?? not realy sure.
    does anyone have any other sugestions????
    Just yanking ideas from my butt here...

    No oil in bottom of hull?

    Have you pulled off your cooling lines to see if the oil is in there? Since you run open loop cooling, that would be my first concern. These engines were made with 15psi water pressure in mind. It MIGHT be possible to blow out a seal between a gasket somewhere. No idea where.

  4. #4
    Moderator two2curupt's Avatar
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    I would tend to agree with Jerry....Easy to not install the o rings on the cooler

  5. #5
    fabrication guru rapidacceleration's Avatar
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    oh ya, all the oils in the bottom of the hull. been sucking it up with the oil boy

    engine oil is not milky and the oil in the hull is not milky too. its gotta be coming from somewere under presure.

    the oil cooler has never been removed. im going to pull it tonight to check anyway.

  6. #6
    Hydrotoys's Avatar
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    When I put mine together, I didn't have the rear oil crank seal on mine. It poured out pretty good. Maybe you have a leak there??

  7. #7
    fabrication guru rapidacceleration's Avatar
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    was your leak the crank seal or the bellow and berring seal??
    i replaced the bellow and berring but not the seal in the end of the crank.

  8. #8
    Site Admin Green Hulk's Avatar
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    gotta be the O rings on the cooler

  9. #9
    Nonstop, all day, everyday. 01xdime's Avatar
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    Isn't it a wonder that oil cooler doesn't leak where it mounts to the block anyway? I mean when you think of something carrying oil pressure you don't think of something thats kinda slip fit and indirectly bolted down. When i pulled that off the GTX i was like holy $hit thats it?

  10. #10
    Have you had your drive shaft out recently?
    If so there is a liped seal and bearing setup that is
    O-clamped to the back of the engine cover.
    Alot of times these seals go bad or get pinched
    and will leak oil into the bottom of the hull without
    being able to see where it is coming from.
    I have run into this before and chased it around for sometime...

    L8TR
    Rudedog

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