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  1. S

    Mercruiser 5.7 EFI Water in Oil

    UPDATE: Water In Oil So I pulled the first head and my head gasket is not compromised at all. There is also no steam cleaning on the cylinder head. Now I have not gotten to the other side yet, but I am leaning towards the loose intake. Also, since I tightened the intake before the tear down...
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    Mercruiser 5.7 EFI Water in Oil

    Sorry, posted to incorrect thread.
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    Mercruiser 5.7 EFI Water in Oil

    Thank you for the reply. I will give an update after i do more tear down.
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    Mercruiser 5.7 EFI Water in Oil

    Thank you for the info. I will be pulling the heads soon.
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    Mercruiser 5.7 EFI Water in Oil

    Thank you for the reply. Would you typically replace both head gaskets at this point if I have one gasket that is split? Would you do any additional maintenance with the heads off? Thanks
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    Mercruiser 5.7 EFI Water in Oil

    Sorry, the pictures will not attach...says there is a site server error.
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    Mercruiser 5.7 EFI Water in Oil

    Hello, I want to give an update on my water in oil on my 1998 mercruiser 5.7, GM Vortec V-8 EFI. I originally thought it was riser or risers gaskets causing the problem. I replaced the riser gaskets, still had the problems. Replaced the risers, exhaust manifolds(26 years old), still had the...
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    Mercruiser 5.7 EFI Water in Oil

    I put oil in the fuel filter that was used during the season. Once the engine dies from the 2cycle, I remove the old and put the new one on, making ready for the next season.
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    Mercruiser 5.7 260 EFI - Water Temp Fluctuations

    Hello, I have twin 1998 5.7 260 EFIs 0L067794/0L067XXX in my Formula with raw water cooling. I would like to ask your opinion as to why I have temperature fluctuations while underway at certain points. I would like to know if it is an indication of any potential problems. When I am under load...
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    Mercruiser 5.7 EFI Water in Oil

    Lou C, I just finished my test run. I checked the oil at the dock and no issues. I do have some minor temperature fluctuations that I would like to ask about in another thread. They are unrelated to changes made due to the milky oil. Thanks for your help. steve
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    Mercruiser 5.7 EFI Water in Oil

    After I run the 2 cycle oil through the filter, i assume i have just ruined its ability to filter the fuel properly. Maybe, I am wrong...
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    Mercruiser 5.7 EFI Water in Oil

    I need to elaborate on my winterizing of the cyclinders…2oz of oil in the center of the fuel filter, which is post filter, shut off fuel, run until it dies…this is in the merc manual for the lay up procedure. Thanks
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    Mercruiser 5.7 EFI Water in Oil

    Lou C, thanks. You are absolutely right about that. Running the boat on plane is what revealed the problem in the first place. I will put the drain plug back in and take it for a spin. Hopefully then I can winterize with confidence. Question, I normally fill my fuel filters with 2oz of 2cycle...
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    Mercruiser 5.7 EFI Water in Oil

    Ya, that’s my question, the oils is brand new from winterizing. I can change it again. But if it would evaporate out then I really don’t need to do I? Sarnone
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    Mercruiser 5.7 EFI Water in Oil

    Many thanks to everybody you have their input. I bought gaskets and permatex nonhardening. I cleaned up and made sure the joints were flat. I reassembled everything, fired up the engine and after some time checked and the milkshake was gone. Gonna change the oil and re-winterize. Thanks Sarnone
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    Mercruiser 5.7 EFI Water in Oil

    Lou c, thanks. I found a torque spec of 33ftlbs, but I am a little weary of that. The bolt head 9/16. Not sure if the diameter of the bolt, I think 3/8. Sarnone
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    Mercruiser 5.7 EFI Water in Oil

    Tpenfield, thanks you for the input. And the other engine did overheat from a busted belt for a moment about 4 years ago and I had to do the gaskets, boots and butterflies. So, that should be holding up okay for now. I’m getting the impression during the tear down that this might be the original...
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    Mercruiser 5.7 EFI Water in Oil

    Scott06, thank you. However, cooling system was fully drained before I took it apart. Also, there is a drain point directly below this location.
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    Mercruiser 5.7 EFI Water in Oil

    Yes, thanks. That is the parting line caused by the manufacturing process. steve
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    Mercruiser 5.7 EFI Water in Oil

    All, I am seeing exchange between water and exhaust. But, I am not an expert...lol. See pic... Steve
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