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  1. #1
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    Dfi oil coming out of exhaust onto cavitation plate

    Optimax 250xs 0t81836. I just changed the air compressor, the tracker valve along with the air and fuel diaphrams. Also had the air and fuel injectors all cleaned and checked after a blown compressor. Now after running on the hose im getting what appears to be fresh dfi oil coming out the port exhaust port onto the cavitation plate. Seems to be a couple ounces each time. Ive been trying to pinpoint an oil leak that pools at the bottom of the pan but oil coming from the exhaust port is completely new
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    Last edited by Duro78; 06-15-2019 at 08:53 PM.

  2. #2
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    Most likely the oil pump. Check the bottom of the pump for oil. Mercury says that the pump is not serviceable, but you can replace the O ring and everything is good. Try searching for this on this site. There is a link to the Bass Boat site there with detailed discussion. I had both pumps start leaking within a week of each other on my 300XS's.

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    Quote Originally Posted by Davidlake View Post
    Most likely the oil pump. Check the bottom of the pump for oil. Mercury says that the pump is not serviceable, but you can replace the O ring and everything is good. Try searching for this on this site. There is a link to the Bass Boat site there with detailed discussion. I had both pumps start leaking within a week of each other on my 300XS's.
    Yeah i saw a couple threads about the oil pump fix. When i originally changed the compressor i primed the oil pump with the scanner but didnt end up running the motor until a week and a half later. I just ran it on the hose and no oil leak. Im thinking the oil is just the unused oil from before
    Last edited by Duro78; 06-16-2019 at 10:53 AM.

  4. #4
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    Could also be the lower crankcase seal....Looks darker than clean oil from the pump.

  5. #5
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    Quote Originally Posted by XstreamVking View Post
    Could also be the lower crankcase seal....Looks darker than clean oil from the pump.
    I'm really hoping its the old oil from the prior priming. Other than minor things the motor has ran strong up until the compressor going but we'll see, I hope to get it back out in the next day or two
    Last edited by Duro78; 06-16-2019 at 05:20 PM.

  6. #6
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    Lower crank seal is no big deal. Worst part is pulling and replacing power head. I seem to get some seal leakage everytime I prime the pumps. It puts a lot of oil in the lower crankcase.

  7. #7
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    Quote Originally Posted by XstreamVking View Post
    Lower crank seal is no big deal. Worst part is pulling and replacing power head. I seem to get some seal leakage everytime I prime the pumps. It puts a lot of oil in the lower crankcase.
    Atleast now i know if i get oil consistently from there thats what it is. Thanks

  8. #8
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    When you prime you also dump a lot out the bleeds, and the compressor drains go straight to the cylinders if the pistons up you will prime out 3-4 table spoons just through the compressor dump lines. Makes a oily mess all through break in

  9. #9
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    Quote Originally Posted by Motv18 View Post
    When you prime you also dump a lot out the bleeds, and the compressor drains go straight to the cylinders if the pistons up you will prime out 3-4 table spoons just through the compressor dump lines. Makes a oily mess all through break in
    Thanks for the info. That confirms what I thought then. This was the first time I primed the oil pump using the ddt
    . I chose that route instead of going thru another break-in. Like you mentioned the amount of oil it goes through and the mess
    Last edited by Duro78; 06-22-2019 at 06:49 PM.

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