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Results 1 to 8 of 8
  1. #1
    Join Date
    Mar 2009
    Location
    Cedar Park, TX, USA
    Posts
    2

    Default When I recently checked the oi

    When I recently checked the oil level gas had accumulated in the crankcase and mixed with the oil. I replaced the fuel pump thinking that the diaphram was leaking fuel into the crankcase. After running the engine on the lake for approx 5 hours (two trips on the lake) fuel is still getting into the crankcase. How can fuel enter the crankcase other than through the fuel pump? What can I check before taking it to the dealer?

  2. #2
    Join Date
    Mar 2009
    Location
    Cedar Park, TX, USA
    Posts
    2

    Default More information: The motor i

    More information: The motor is a 2003 fuel injected 4 stroke Yamaha. When operating it runs normally with full power and acceleration. I'm stumped.

  3. #3
    Join Date
    Dec 2008
    Location
    Victoria, B.C., Canada
    Posts
    645

    Default check t-stats and that engine

    check t-stats and that engine is coming up to temp. If its running cold it will pass gas( bad phrase) past the rings and into the crankcase.

  4. #4
    Join Date
    Feb 2009
    Location
    perth, wa, Australia
    Posts
    956

    Default Terry how do you know fuel is

    Terry how do you know fuel is in the crankcase (NOT TRYING TO BE FUNNY)

  5. #5
    Join Date
    Sep 2006
    Location
    SF BAY AREA, CALI, USA
    Posts
    8,641

    Default "because he knows that the 115

    "because he knows that the 115hp is prone to it, LOL"
    HUMAN BUILT = HUMAN FIXED

    CERTIFIED MARINE TECHNICIAN

    WWW.SWITCHBAIT.COM

  6. #6
    Join Date
    Sep 2008
    Location
    Pigeon, MI, USA
    Posts
    10

    Default "Having the same trouble with

    "Having the same trouble with my Yamaha 115hp 2004. Took it to the shop last fall and they said to run "ring free" through it. I added the ring free this Spring, took it out once, and came back with gas in the oil. It idle rough, stalls occasionally, but seems to run good at cruising speed."

  7. #7
    Join Date
    Dec 2008
    Location
    Victoria, B.C., Canada
    Posts
    645

    Default check fuel pumps and t-stats

    check fuel pumps and t-stats

  8. #8
    Join Date
    Sep 2006
    Location
    SF BAY AREA, CALI, USA
    Posts
    8,641

    Default prop t-stat fuel pump valve

    prop
    t-stat
    fuel pump
    valves non-adjusted
    HUMAN BUILT = HUMAN FIXED

    CERTIFIED MARINE TECHNICIAN

    WWW.SWITCHBAIT.COM

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