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Thread: 1991 omc 3.0

  1. #1

    Default 1991 omc 3.0

    I have a 91 omc 3.0 with a cobra drive.
    my question is:
    Is anyone familiar with a 1" spacer between the flyweel and the engine coupler??
    when i bought the boat, it needed repair. he sheared off the studs in the flywheel.
    I was simply trying to find new studs, and every place I look... nobody has a record of this spacer. so the stock studs that are offered are 1" too short.
    any help, or insight on this, I would appreciate it.

  2. #2
    Join Date
    Mar 2015
    Location
    Brandon, VT.
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  3. #3
    Join Date
    Mar 2019
    Location
    Ottawa Canada
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    454

    Default Re: 1991 omc 3.0

    I've done a couple of cobra engines. Never seen a 1 inch spacer. . Flywheel and coupler only. A spacer would make the drive sit too far in the coupler. And would most likely cause damage to the coupler and crankshaft studs.
    The nuts when mounted on the studs with coupler and flywheel should just protrude past the coupler a few threads. Have you got your new studs in backwards by chance?
    Last edited by mechanicman; 03-27-2019 at 02:55 PM.

  4. #4

    Default Re: 1991 omc 3.0

    Already tried to find em on the website. Even called a tech guy. He went through everything too, multiple years up and down, couldn't find anything

  5. #5

    Default Re: 1991 omc 3.0

    The only reason I can think of for the spacer, is maybe because of the engine mount location compared to the drive. The coupler would not be far enough back to properly engage the the drive shaft? the stock studs are 2" long. the ones I have that are all broken, are 3" long. they were installed properly in the crank. short thread side in, long thread side out toward the coupler. I have the 3" studs now. I'm going to put it back together the way it was, with the spacer, and pay really close attention to how the shaft engages with the coupler when re-installing the drive. How far should the shaft really be in the coupler??

  6. #6
    Join Date
    Mar 2019
    Location
    Ottawa Canada
    Posts
    454

    Default Re: 1991 omc 3.0

    Close to 3" I would presume. Grease up the spline send it in. Seated. Then pull it out to see how far it went in.

  7. #7

    Default Re: 1991 omc 3.0

    I do not see any modification...only what i assume are stock holes. I just wonder if it were a special adapter for using something a year older in a year newer boat. something done at the factory, that was never documented. Same thing happened on the exhaust manifold. still using old manifolds on newer style heads.

  8. #8
    Join Date
    Jun 2006
    Location
    Spotswood, NJ, USA
    Posts
    4,697

    Default Re: 1991 omc 3.0

    unless someone tried to change the coupler to a non -omc one

  9. #9
    Join Date
    Jun 2006
    Location
    Spotswood, NJ, USA
    Posts
    4,697

    Default Re: 1991 omc 3.0

    does it look like this one

    how to throw dice

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