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350 chevy marine engine has a noise when going above 2500rpm, no noise at idle or running 10knots or less, when not neutral I ran throttle up to 5000rpm no noise over 6000rpm slight noise but nothing like when in gear Thanks in advance for any help, Jim

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  • millrun07 May 11, 2009

    thanks I will check this weekend and let you know

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Sounds like its a drivetrain problem. Just for fun check your prop hub, it could be slipping under heavy load. If you have u-joints they could be going bad. Sometimes if the outdrive is pitched up too far on I/O units it is an uncomfortable bend for the U-Joints. There are limit adjustments for the I/O to prevent that from happening in gear.

Posted on May 11, 2009

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Posted on Jan 02, 2017

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