Recent content by Voyager NY

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    Mercruiser 409 engine severe vibration issue

    By the way to everyone I really appreciate your reply's
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    Mercruiser 409 engine severe vibration issue

    My thought is at this point is that the motor has a internal balance issue but merc is fixing all the things that are breaking due to the vibration but are saying that the vibration is normal. I could see at idle due to the flat crank but this vibration is at all rpm's The LP fuel pump and the...
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    Mercruiser 409 engine severe vibration issue

    Compression test was done and spark plugs all burning the same, the initial thought was that there was a misfiring cylinder
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    Mercruiser 409 engine severe vibration issue

    YES It has a flat plane crank
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    Mercruiser 409 engine severe vibration issue

    also I am using the new flywheel that came with it. The harmonic balancer is a liquid filled ballancer
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    Mercruiser 409 engine severe vibration issue

    There was a 383 mpi in there previously and the engine is a new CPO motor from quicksilver designed 409 for a direct replacement for older 350/383 engines,this motor is from merc.
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    Mercruiser 409 engine severe vibration issue

    I recently purchased a Certified Pre Owned (CPO)engine from Doug Russel Marine. The engine was installed and at first start up i noticed a high vibration from the engine , this is before the drive was installed. The engine was aligned with the coupler ,drive installed and boat launched. The...
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