Has anyone had to replace their Engine Coupler? On my 2003 280 I have this issue that I thought was a spun prop hub. After taking the prop off and taking it apart, we realized the prop isn't the issue. After googling I find some people having issues with their mercruiser Alpha 1 Engine couplers. This year has been a huge pain and a ton of money. Hoping I am missing something. When I go to plane off, the port side engine starts running away as if it is cavitating and I have to back down on it and go harder on the starboard. Sometimes while on plane and cruising the same thing happens. I seriously don't want to have to haul the engines again, as we had to replace the starboard engine twice this season already.
Unfortunately it sounds like you are correct. Typically, the type of props you have (with that plastic insert) don't really "spin" the way the older, rubber hubbed ones would. Meaning, these newer style, while they tend to last much longer, when they go... they go. No "in between". It does sound like it's your coupler. Generally speaking, the couplers used in your setup are pretty stout and aren't really "known" for spinning. But, of course, they're a mechanical thing and anything is possible. I wish I could give you a better (more hopeful) response - I can certainly understand the predicament you're in - especially since you said you've had the stbd engine out twice! On the plus side, you're probably getting to be a pro on yanking an engine out!
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