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Blue Thunder · 06-03-2014, 09:23 PM

Dick, since it's an Alpha One, it's probably an older boat, I assume? If it's not the prop hub, which you can easily determine by swapping the prop, it's likely the splined coupler which is mounted on the flywheel and mates with the very end of the input shaft of the out drive. Unfortunately, you have to pull the engine to replace it. If you google Mercruiser Alpha One engine coupler you will get numerous results.

Edit: If it's the coupler, it should look something like this but there are other styles depending on whether its a 4, 6, or 8 cylinder. I had one go on my 76 Penn Yan with the inline 6 cylinder. I had to pull the engine. Once out, it was a five minute job with 6 bolts.
http://www.amazon.com/MERCRUISER-ENG...ruiser+coupler

BT

06-03-2014, 09:23 PM	#2
Blue Thunder Senior Member Join Date: Apr 2004 Location: Eastern MA & Frye Island/Sebago Lake, Maine Posts: 952 Thanks: 253 Thanked 351 Times in 158 Posts	Dick, since it's an Alpha One, it's probably an older boat, I assume? If it's not the prop hub, which you can easily determine by swapping the prop, it's likely the splined coupler which is mounted on the flywheel and mates with the very end of the input shaft of the out drive. Unfortunately, you have to pull the engine to replace it. If you google Mercruiser Alpha One engine coupler you will get numerous results. Edit: If it's the coupler, it should look something like this but there are other styles depending on whether its a 4, 6, or 8 cylinder. I had one go on my 76 Penn Yan with the inline 6 cylinder. I had to pull the engine. Once out, it was a five minute job with 6 bolts. http://www.amazon.com/MERCRUISER-ENG...ruiser+coupler BT __________________ " Live for today because yesterday is gone and tomorrow may never come" Last edited by Blue Thunder; 06-04-2014 at 08:58 AM.