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  1. #1
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    DFI oil leaking from powerhead

    Hi all,

    Optimax 135 hp - 150 hours total.
    2006
    1B256337

    I'm hoping you can help me location the problem with DFI oil leaking from the power head.

    After coming home from a trip DFI oil is coming out through the propeller, not immediately after the motor is trimmed down, but after several hours.
    It is definitely DFI oil as the color is clear light brown.

    There are no visual leaks from the engine oil reservoir, hoses og pump, so I think it is leaking through out the bottom end cap assembly that holds the seals for the drive shaft.
    I took of the LU and there is a little amount of oil around the water pump, which confirms possible bad seals that allows the oil to leak down at the drive shaft.

    Do you agree or are there any other possibilities?

    Thanks
    Martin
    Thanks

    /Martin

    Askeladden 635 Freestyle
    Mercury Verado 300

  2. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    Apr 2008
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    Greenville, SC (US)
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    #2
    Martin:

    Definitely sounds like the lower crankshaft seals need to be replaced.


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
    Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor

  3. Member
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    #3
    Thanks for confirming Don, I appreciate your fast help.

    I will immediately replace:
    #22 O-RING, (3.237 x .103) part no. 62700
    #23 SEAL part no. 41953

    I have the service manual, but is it possible to remove the lower end cap with the seals, without removing the crankcase cover?
    Thanks

    /Martin

    Askeladden 635 Freestyle
    Mercury Verado 300

  4. Member
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    Nov 2011
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    #4
    Trying to lift off the power head.
    But its stuck on the port side, it looks like corrosion is locking 2 pins.

    It's not possible to spray wd40 as there is not even the smallest crack between the PH and adaptor plate.

    Any ideas is very appreciated ��
    Thanks

    /Martin

    Askeladden 635 Freestyle
    Mercury Verado 300

  5. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    Greenville, SC (US)
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    #5
    Wood or Plastic Wedges, PB Blaster, Aero Kroil, etc.


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
    Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor

  6. Member
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    #6
    Well - replacing the lower seals did the job. Have done some test runs and no leaks have occurred
    Thanks

    /Martin

    Askeladden 635 Freestyle
    Mercury Verado 300