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Mercruiser 3.0 thumping/knocking

andycasy

New member
I have a mercruiser 3.0
Had it out all afternoon, running smooth.
was running at full speed when it seemed to lose power slightly, but then went back to normal.
I dropped the speed down to just above idling and then noticed what seemed to be a small thumping or knocking. I then took ran at have speed, no problem and then back up to full with no problem. I drove it back to the marina which was 15-20 minutes away with no issues even when idling down and no thumping or knocking.
Any idea what this could have been?

Thanks for any help

Andrew O'Hara
 
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