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    Mercruiser 409 engine severe vibration issue

    No, so far it is not at no cost to me. The initial diagnosis for the vibration has not been covered $1,400 and no resolution has been found. Merc is paying for the results of the vibration as one offs. What about the damage to the crank and bearings how long will they last being run with this...
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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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