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  1. #1
    Join Date
    Jul 2013
    Location
    Dinwiddie, VA
    Posts
    19

    Default engine rotation on 98 moomba outback

    Hopefully someone cab help me out. I have a 98 outback with a pcm seamaxx 5.7l that I'm rebuilding and cant figure out rotation of the motor called PCM the say its standard LH rotation as viewed from the flywheel but the firing order on the motor says 12756348 anyone have any ideas of which way it actually rotates thanks
    98 Outback
    PCM LT1

  2. #2
    Join Date
    May 2003
    Location
    south east michigan
    Posts
    243

    Default

    As far as I know all inboard ski boats are lh rotation except for older Natiques.You could look at the prop on the boat and that will tel you which way it rotates.
    jy

  3. #3
    Join Date
    Mar 2003
    Location
    s.e. washington state
    Posts
    2,064

    Default

    Confirmed. Counterclockwise rotation at the prop when viewed from the stern.
    1998 Mobius
    310 HP PCM

  4. #4
    Join Date
    Jul 2013
    Location
    Dinwiddie, VA
    Posts
    19

    Default

    Then why would the firing order on the motor be for a reverse rotation motor its stamped on the valve cover from PCM 12756348
    98 Outback
    PCM LT1

  5. #5
    Join Date
    May 2003
    Location
    south east michigan
    Posts
    243

    Default

    It,s posible the motor could be RH rotation,or could just be the wrong valve cover.I know when an inboard is in gear going foward the transmission is direct drive.The prop has letters stamped on it telling if it is LH or RH drive.
    jy

  6. #6
    Join Date
    Jan 2008
    Location
    Tallahassee, FL
    Posts
    11,075

    Default

    When in doubt, send a PM to Engine Nut. He knows everything in this area.

    Edit: Ah, whatever. I just sent him a PM. He has been golden when we need him.
    Last edited by kaneboats; 03-14-2014 at 10:54 AM.
    My Mom said I'm not allowed to get wet!
    2008 LSV
    2000 Outback LS (sold)
    Exile Tunes
    PWI
    LLTR!!!!!!!!



  7. #7
    Join Date
    Aug 2006
    Location
    Millington TN
    Posts
    143

    Default

    If you are rebuilding the engine and have it taken apart, you should be able to see if the engine uses a conventional timing chain or does it use timing gears. Typically right hand rotation engines used gears instead of chains so the cam and distributor would continue to turn the way it would on a standard rotation engine while the crankshaft turned clockwise.
    Larry Engelbert
    Indmar Marine Engines
    "Power to the Sport"

  8. #8
    Join Date
    Jan 2003
    Location
    Minnesota and Wisconsin
    Posts
    1,115

    Default

    I have a 99 Mobius - which is basically an Outback - and it has an Indmar 5.7L engine with standard rotation. If you have a PCM - maybe it is aftermarket? Wasn't Nautique using PCM for a while and they are opposite rotation - correct?
    If you believe something to be true, it will be - in it's consequences.
    http://bensonwdby.home.comcast.net/

    1999 Mobius - DD - 5.7L Carb - Perfect Pass

  9. #9
    Join Date
    Mar 2003
    Location
    s.e. washington state
    Posts
    2,064

    Default

    Moomba was using both PCM and Indmar at the time and the rotations were all the same for the Outback.
    1998 Mobius
    310 HP PCM

  10. #10
    Join Date
    Aug 2013
    Location
    Bainbridge, GA
    Posts
    14

    Default

    Look on your intake for the firing order. If it is a stock chevy manifold it will be stamped on the intake. Standard chevy engines are left turn. Firing order should be 18436572. My 97 outback is standard rotation, though it is a Mercruiser rather than PCM.
    1997 Outback

    What this post needs is....more COWBELL!

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