The yard installed a flexible shaft coupling on my boat in August. Since this is plastic it separates the new ss shaft from the transmission. The boat is at a marina in salt water but remains unplugged from the dock most of the time. There is a zinc on the end of the shaft, that has a flaky surface but still a lot there. I checked it last week when I cleaned the bottom. I added a second zinc ball around the shaft in front of the bronze strut. My question is should I run a wire across the plastic coupling? I am concerned about galvanic corrosion in the rest of the boat (aluminum mast). Thanks
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Ohm Meter
Use a ohm meter to see if there is an electrical connection between the shaft and your electrical ground. I suspect that your ground is the keel boats. If the resistence is high or infinate, then the zincs are isolated and will do no good. Probably a tinned braid that is clamped on the shafts around the flexible coupling will solve the problem.
Use a ohm meter to see if there is an electrical connection between the shaft and your electrical ground. I suspect that your ground is the keel boats. If the resistence is high or infinate, then the zincs are isolated and will do no good. Probably a tinned braid that is clamped on the shafts around the flexible coupling will solve the problem.
Actualy...
If your going to install a bonding wire A.B.Y.C. recomends an 8ga wire or larger in a green casing. Braid is specificaly not recomended. Pat McCartin Inland Marine Diesel Buford, Ga imd_ga@hotmail.com
If your going to install a bonding wire A.B.Y.C. recomends an 8ga wire or larger in a green casing. Braid is specificaly not recomended. Pat McCartin Inland Marine Diesel Buford, Ga imd_ga@hotmail.com
Also Check with Manufacturer
The first thing I'd do is find out who the manufacturer of the coupling is. Once you know who made it then get their installation instructions and put them with the boat equipment papers. The installation instruction should have been given to you by the yard and in lieu of them providing the instructions voluntrily there is nothing to prevent you from asking for them. However, since they apparently didn't provide them to you it would be my guess that once the boat has left the yard they have probably thrown all the paperwork away. Once you know the manufacturer then go to their web site and see if they have instructions that can be downloaded. In the case of my flexible coupling, R&D, they have this to say about how to do bonding: Earthing Connectors 'R & D Marine' Earthing Connectors consists of a Silver impregnated rubber strip, which when fitted through the axis of the coupling between the two fail safe straps gives electrical continuity, R & D have sizes to fit all 910 series couplings. Installation Procedure for R & D Earthing Connectors 1. While carrying out the following procedure, ensure that the connector is not contaminated by grease or dirt. 2. Before fitting the coupling into the drive train, remove 2 off bolts holding one of the fail safe straps. 3. Remove the fail safe strap to uncover the hole in the center of the coupling. 4. Roll up the earthing connector (lengthways) as tight as possible. [drawing] 5. Push into the hole previously uncovered by removing the strap as far as possible. 6. Replace the fail safe strap ensuring that the connector is not damaged, replace 2 off bolts. 7. Fit the coupling as per the installation instructions. 8. Check electrical continuity on installation and thereafter at three to six month intervals. There is R&D info at UK manufacturer: http://www.randdmarine.com/flexiblesc.asp [best information] US importer: http://www.pyiinc.com/index.php?section=rd_marine&action=shaft-coupling&sn=2
The first thing I'd do is find out who the manufacturer of the coupling is. Once you know who made it then get their installation instructions and put them with the boat equipment papers. The installation instruction should have been given to you by the yard and in lieu of them providing the instructions voluntrily there is nothing to prevent you from asking for them. However, since they apparently didn't provide them to you it would be my guess that once the boat has left the yard they have probably thrown all the paperwork away. Once you know the manufacturer then go to their web site and see if they have instructions that can be downloaded. In the case of my flexible coupling, R&D, they have this to say about how to do bonding: Earthing Connectors 'R & D Marine' Earthing Connectors consists of a Silver impregnated rubber strip, which when fitted through the axis of the coupling between the two fail safe straps gives electrical continuity, R & D have sizes to fit all 910 series couplings. Installation Procedure for R & D Earthing Connectors 1. While carrying out the following procedure, ensure that the connector is not contaminated by grease or dirt. 2. Before fitting the coupling into the drive train, remove 2 off bolts holding one of the fail safe straps. 3. Remove the fail safe strap to uncover the hole in the center of the coupling. 4. Roll up the earthing connector (lengthways) as tight as possible. [drawing] 5. Push into the hole previously uncovered by removing the strap as far as possible. 6. Replace the fail safe strap ensuring that the connector is not damaged, replace 2 off bolts. 7. Fit the coupling as per the installation instructions. 8. Check electrical continuity on installation and thereafter at three to six month intervals. There is R&D info at UK manufacturer: http://www.randdmarine.com/flexiblesc.asp [best information] US importer: http://www.pyiinc.com/index.php?section=rd_marine&action=shaft-coupling&sn=2
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