Re: [Amel Yacht Owners] A Little Drive Train Help, please
Paul LaFrance <pflafrance@...>
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A possible item is the C Drive cross member is loose. Another possibility is the engine is out of alignment. Check that the Flex coupling bolts are tight.
We had the same noise and we ended up breaking the shaft and ruining the flex coupling.
SV NOMAD SM #362
Currently in Grenada
Date: Mon, 11 Apr 2016 22:13:33 -0400
Subject: RE: [Amel Yacht Owners] A Little Drive Train Help, please
I believe the simplest way to see if the drive is tight is to see if the sealant on the bolt is flat. If is domed as in my case, it is loose.
Where are you?
Kimberlite Amel Super Maramu #376
From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Monday, April 11, 2016 8:07 PM
Subject: Re: [Amel Yacht Owners] A Little Drive Train Help, please
Hi, Tom. Only thing I can think of is the "foot" of the Cdrive could be moving back and forth (side to side) slightly. Does it feel solid? Is the bolt that holds the foot to the keel (below and aft of the prop) tight?
Let us know what you figure out.
We are currently in USVI, trying to get back to Chesapeake Bay.
I had noticed a loud thumping noise, most noticeable in the pilot berth companionway, seemingly coming from the region of the prop. I dove on the boat, and found a one centimeter wide, 60 cm long hard rubber strip that had wound once around the prop shaft. I removed it, and thought the problem was solved.
However, the noise did not go away. It is not noticeable below 1,600 RPM, but becomes very loud at 1,800. It is a thumping type noise, roughly 3 to 5 times second at 1,800 RPM. Looking at the prop spinning, it looks good. It is clean. The blades spin freely (original AutoProp H6, I think), and do not seem to have excess play in them. The C-drive oil is not milky. The Volvo engine seems and sounds OK.
We are stuck, afraid to put to sea with this problem. Will probably haul out and look. Does anyone have any ideas?
SM Aletes #240
Red Hook, USVI