mercruiser starts but makes horrible noise

by Terry
(Scottsdale, AZ., USA)

Our 1996 SeaRay 22 ft. bowrider has a Mercruiser 5.7 L. Alpha I Gen 2 drive system. Last time out it started and ran fine from the ramp to the gas dock. After sitting for an hour, it was hard to start and then made horrible noises. Grunchy and very mechanical. We thought an engine bearing had spun or perhaps a serious outdrive problem.

We pulled the drive and had it checked. It is fine.

We then started the engine with the drive removed and it sounded fine. We are at a loss as to what caused the noises and the hard start! There was nothing interferring with the external parts of the engine, and the noise was obviously in the engine /drive assembly!

Any help?

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