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  1. #1

    Default 1984 Mercury 115 in-line six

    Hello, I have a 1984 Mercury 115 in-line six.
    Motor has 125 compression all cylinders
    Spark in all cylinders
    TDC lines up with the timing decal
    Motor will nt fire or start with squirt of gasoline in carburators
    Please help

    Cbenjamin

  2. #2
    Join Date
    Sep 2010
    Location
    ontario
    Posts
    13,767

    Default Re: 1984 Mercury 115 in-line six

    Did this problem show up suddenly ?---any other history on it ?

  3. #3
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    15,238

    Default Re: 1984 Mercury 115 in-line six

    Fouled plugs?

    Jeff

  4. #4

    Default Re: 1984 Mercury 115 in-line six

    Quote Originally Posted by racerone View Post
    Did this problem show up suddenly ?---any other history on it ?
    I do not know the history because I received this engine from a friend and he did not have much info.
    I remove the engine and controls from a boat. I have always wantede one of these engines.
    I removed the plugs and took a night time flash of the pistons and noticed detonation on number 2 but no holes
    in any of them. I took a smooth roundish object and walked around the piston and wall and did not feel any
    abnormalities.
    Can it be out of time? I want to leave #1 plug and remove and ground the other 5 and spin it at night with a timing light.
    Ang suggestions are really appreciated.
    Thanks

    cbenjamin

  5. #5
    Join Date
    Sep 2010
    Location
    ontario
    Posts
    13,767

    Default Re: 1984 Mercury 115 in-line six

    Does spark jump a gap of 3/8" or more, yes or no?----You will need a new impeller if you get it running.----Yes they are a nice smooth running motor if in good condition.

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