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Replacing rubber parts in Vetus Type 6 Flexible coupling 35mm shaft
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James Alton
Confirming that the Vetus flexible rubber coupling type 6 #KO18 rubber doughnuts supplied by Amel were exactly the same dimensions as the original parts and fit perfectly. My boat is a 1987 Maramu with a 35mm shaft. James SV Sueno Sent from Samsung tablet.
-------- Original message -------- From: "James Alton via Groups.Io" <lokiyawl2@...> Date: 7/3/19 11:11 AM (GMT+01:00) To: main@AmelYachtOwners.groups.io Subject: Re: [AmelYachtOwners] Replacing rubber parts in Vetus Type 6 Flexible coupling 35mm shaft Miles, Thanks for your input. I now have my Vetus Flexible coupling apart. Removal of the forward half of the coupling is simply a matter of removal of the coupling bolts. This exposes the forward half of the rubber doughnuts. It looks like if the coupling bolts and the aft coupling half was cocked that it might provide enough clearance to remove the rubber doughnuts, not sure. The collar nut traps the coupling bolts. The proper way appears to be to remove the collar nut which allows the aft half of the coupling to slid aft, completely exposing the doughnuts. The collar nut is to be tightened to 130 pounds using a spanner wrench that is 20" long so something around 200 foot pounds. I was able to find a thin wrench only 9 inches long so I was pretty concerned that removal and retightening the collar nut might be impossible, hence my posted question. It turns out however that after lots of soaking with penetrating oil that the collar nut easily unscrewed by tapping the short spanner wrench with a rawhide mallet so clearly the nut was already loose. So I now have complete access to the rubber doughnuts and this will be an easy job so long as the spanner wrench does not fold up trying to torque the collar nut. Vetus lists a 60-90mm 20 inch long spanner wrench on their website but show no stock. I think I will try to find a spanner wrench that exactly fits the collar nut to have aboard. I think the adjustable wrench will pop out of the slot in the collar nut if tapped with a hammer. I purchased a package of the rubber doughnuts from Amel and a second package from SVB24. I am about to find out of they are correct. The original rubber doughnuts actually look to be in quite good shape so perhaps they have been replaced. Send me PM sometime and update us on your Atlantic crossing. If you would like any photos of the Vetus coupling disassembled let me know. Best, James Alton SV Sueno Maramun#220 Sent from Samsung tablet. -------- Original message -------- From: "smiles bernard via Groups.Io" <smilesbernard@...> Date: 7/2/19 11:20 PM (GMT+01:00) To: main@AmelYachtOwners.groups.io Subject: Re: [AmelYachtOwners] Replacing rubber parts in Vetus Type 6 Flexible coupling 35mm shaft Hi James I watched a mechanic undo mine when I had the engine mounts replaced No special tools were used As far as I remember there were a series of bolts around the outer perimeter that connected the 2 halves. The bolt heads I think had holes in to allow for seizing wire Once undone and the shaft pulled aft the rubber cones that sit on shafts were exposed We want to replace mine to but could source them at the time very easily so it’s something I might have a go at soon. All the very best Miles Horta Azores Heading back to the uk as soon as the weather allows !
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James Alton
Miles, Thanks for your input. I now have my Vetus Flexible coupling apart. Removal of the forward half of the coupling is simply a matter of removal of the coupling bolts. This exposes the forward half of the rubber doughnuts. It looks like if the coupling bolts and the aft coupling half was cocked that it might provide enough clearance to remove the rubber doughnuts, not sure. The collar nut traps the coupling bolts. The proper way appears to be to remove the collar nut which allows the aft half of the coupling to slid aft, completely exposing the doughnuts. The collar nut is to be tightened to 130 pounds using a spanner wrench that is 20" long so something around 200 foot pounds. I was able to find a thin wrench only 9 inches long so I was pretty concerned that removal and retightening the collar nut might be impossible, hence my posted question. It turns out however that after lots of soaking with penetrating oil that the collar nut easily unscrewed by tapping the short spanner wrench with a rawhide mallet so clearly the nut was already loose. So I now have complete access to the rubber doughnuts and this will be an easy job so long as the spanner wrench does not fold up trying to torque the collar nut. Vetus lists a 60-90mm 20 inch long spanner wrench on their website but show no stock. I think I will try to find a spanner wrench that exactly fits the collar nut to have aboard. I think the adjustable wrench will pop out of the slot in the collar nut if tapped with a hammer. I purchased a package of the rubber doughnuts from Amel and a second package from SVB24. I am about to find out of they are correct. The original rubber doughnuts actually look to be in quite good shape so perhaps they have been replaced. Send me PM sometime and update us on your Atlantic crossing. If you would like any photos of the Vetus coupling disassembled let me know. Best, James Alton SV Sueno Maramun#220 Sent from Samsung tablet.
-------- Original message -------- From: "smiles bernard via Groups.Io" <smilesbernard@...> Date: 7/2/19 11:20 PM (GMT+01:00) To: main@AmelYachtOwners.groups.io Subject: Re: [AmelYachtOwners] Replacing rubber parts in Vetus Type 6 Flexible coupling 35mm shaft Hi James I watched a mechanic undo mine when I had the engine mounts replaced No special tools were used As far as I remember there were a series of bolts around the outer perimeter that connected the 2 halves. The bolt heads I think had holes in to allow for seizing wire Once undone and the shaft pulled aft the rubber cones that sit on shafts were exposed We want to replace mine to but could source them at the time very easily so it’s something I might have a go at soon. All the very best Miles Horta Azores Heading back to the uk as soon as the weather allows !
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smiles bernard
Hi James I watched a mechanic undo mine when I had the engine mounts replaced No special tools were used As far as I remember there were a series of bolts around the outer perimeter that connected the 2 halves. The bolt heads I think had holes in to allow for seizing wire Once undone and the shaft pulled aft the rubber cones that sit on shafts were exposed We want to replace mine to but could source them at the time very easily so it’s something I might have a go at soon. All the very best Miles Horta Azores Heading back to the uk as soon as the weather allows !
On 1 Jul 2019, at 11:30, James Alton via Groups.Io <lokiyawl2@...> wrote:
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James Alton
Hello,
Looking for advice on the disassembly and replacement of the rubber parts on what appears to be an original Vetus Type 6 Flexible coupling on the 35mm shaft of my1987 Marmu. (No C drive) If I will need any specialty tools such as the collar wrench for the job please let me know. Thanks, James Alton SV Sueno Maramu #220 Arbatax, Sardinia
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