[Amel Yacht Owners] Re: bow thruster possible tube out of round


Bill & Judy Rouse <yahoogroups@...>
 

Jim,

Possibly the bow thruster hit some object in the water while extended, deforming the tube. You can replace just the tube, if Amel has that part and possibly there is an owner who replaced the entire thruster that may have a tube.

Bill Rouse
BeBe Amel 53 #387
Sent from my tablet
+1832-380-4970 USA Voice Mail

On Jun 26, 2016 2:55 PM, "capt.anderson@... [amelyachtowners]" <amelyachtowners@...> wrote:
 

Thank you everyone for your comments and interest. Here is my bowthruster in-the-water re-installation report: There was a little green slimy growth inside the trunk which I had my diver clean. It wasn’t bad and was not enough to be a problem. No barnacles or crustations. Upon re-installation (with a diver standing by) the shaft jammed at the same place it did on the way down, which is with about 4” of shaft above the interior seal. It was not possible to pull up hard enough to pull the shaft further up.  All it took was a gentle push from the diver below to overcome the resistance and it came up.  The thruster now operates fine however when retracting, at that exact 4” spot you can hear the retraction motor load up slightly for less than one second and you can see an ever-so-slight pause or “hiccup” in the upward movement of the shaft.  During extension the shaft hangs up in the same place on the way down but it is more pronounced. The extension/retraction motor doesn’t load up because the heavy weight of the bowthruster motor is enough to overcome the resistance. (I made a 0:27 low-resolution/small file size video but cannot easily figure out how to upload it here. I will if I can figure out ho to.)  My best guess is that the shaft is out-of-round at the point where it hangs up. For the time being my plan is to only service the bowthruster when the boat is out of the water, and at that time to see if a machine shop can precisely measure the top of the shaft and mill it back to the correct specification then. I will also first consult with Amel and ask for their suggestions and (ugh!) get a quote for an entire new bowthruster trunk assembly. And, I’m open to suggestions!  Since I’m casting off tomorrow for Alaska I will operate as is for now. All the Best to the Group & thanks for your input,

Jim

SM384 Sirena Azul

Seattle


amelforme
 

Hi Jim. I have to agree with Bill on this one. Had the same thing happen on a client’s boat I had up for sale. He hit something hard with the thruster down and the prop came off. Tried to retract the thruster, would only go half way. There was a measurable distortion in the shaft/’tube’. We removed the thruster and sanded the distorted area and examined it with all the intensity possible to see if it was compromised. It looked good so we sanded a bit undersize and used thinned epoxy to ‘dust’ on several coats with a Preval sprayer (google it, wonderful tool!) to seal it up. That was over 16 years ago and it still works fine. Put some olive oil on your fingertips, close your eyes and gently ‘feel’ the thruster tube. You will be surprised how sensitive your fingers can be if you tune out everything other than what you are trying to feel. I am not joking. Just don’t scratch your nose as you will soon be looking for balsamic vinegar…

 

Good luck with it. Joel

Joel F. Potter/Cruising Yacht Specialist LLC

THE EXPERIENCED AMEL GUY

954 462 5869 office

954 812 2485 cell

 

 

 

From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Monday, June 27, 2016 2:31 PM
To: amelyachtowners@...
Subject: Re: [Amel Yacht Owners] Re: bow thruster possible tube out of round

 

 

Jim,

Possibly the bow thruster hit some object in the water while extended, deforming the tube. You can replace just the tube, if Amel has that part and possibly there is an owner who replaced the entire thruster that may have a tube.

Bill Rouse
BeBe Amel 53 #387
Sent from my tablet
+1832-380-4970 USA Voice Mail

On Jun 26, 2016 2:55 PM, "capt.anderson@... [amelyachtowners]" <amelyachtowners@...> wrote:

 

Thank you everyone for your comments and interest. Here is my bowthruster in-the-water re-installation report: There was a little green slimy growth inside the trunk which I had my diver clean. It wasn’t bad and was not enough to be a problem. No barnacles or crustations. Upon re-installation (with a diver standing by) the shaft jammed at the same place it did on the way down, which is with about 4” of shaft above the interior seal. It was not possible to pull up hard enough to pull the shaft further up.  All it took was a gentle push from the diver below to overcome the resistance and it came up.  The thruster now operates fine however when retracting, at that exact 4” spot you can hear the retraction motor load up slightly for less than one second and you can see an ever-so-slight pause or “hiccup” in the upward movement of the shaft.  During extension the shaft hangs up in the same place on the way down but it is more pronounced. The extension/retraction motor doesn’t load up because the heavy weight of the bowthruster motor is enough to overcome the resistance. (I made a 0:27 low-resolution/small file size video but cannot easily figure out how to upload it here. I will if I can figure out ho to.)  My best guess is that the shaft is out-of-round at the point where it hangs up. For the time being my plan is to only service the bowthruster when the boat is out of the water, and at that time to see if a machine shop can precisely measure the top of the shaft and mill it back to the correct specification then. I will also first consult with Amel and ask for their suggestions and (ugh!) get a quote for an entire new bowthruster trunk assembly. And, I’m open to suggestions!  Since I’m casting off tomorrow for Alaska I will operate as is for now. All the Best to the Group & thanks for your input,

Jim

SM384 Sirena Azul

Seattle