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  1. #1
    Petty Officer 3rd Class
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    Jul 2003
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    Default OMC 3.0 Firing Order

    Does anyone know the firing order for a 4 cylinder omc engine? Thanks.
    1989 Thompson 240 Fisherman, 5.0L Merc. Alpha 1

  2. #2
    Lieutenant Commander Boatin Bob's Avatar
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    Sep 2001
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    Lake Simcoe, Ontario
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    Default Re: OMC 3.0 Firing Order

    1-3-4-2

  3. #3
    Fleet Admiral
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    East coast NJ
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    Default Re: OMC 3.0 Firing Order

    1,3,4,2
    NO PERSONAL QUESTIONS, THIS IS WHAT THE FORUM IS FOR.

  4. #4
    Senior Chief Petty Officer
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    Jun 2004
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    Default Re: OMC 3.0 Firing Order

    I have a Clymers for 86 to 93 and all are the same. 1, 3, 4, 2 with the #1 being the cyliners most forward in the boat.

  5. #5
    Honorary Moderator Emeritus Don S's Avatar
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    Aug 2004
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    Western WA.
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    Default Re: OMC 3.0 Firing Order

    vatter41I would be careful about quoting anything from a Clymers manual. There is so much wrong information found in them it's scarry.Lots of instanses where posters quote the Clymers manual as to what they did only to find out it was bad information.
    Don S.


    Please, no PM's (Private Messages) regarding boat/engine problems.
    That is what the forums are for.
    Only forum/moderator issues will be answered in PM's.

  6. #6
    Senior Chief Petty Officer
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    Jun 2004
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    Default Re: OMC 3.0 Firing Order

    Thanks Don but I have already found this out on the drive side, not as much on the engine side. Unfortunately, I dont have the original OMC manual. I bought the boat used and had no documents with it. I bought the Clymers as it was the best thing I could get at the time.

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