𝗖-𝗗𝗿𝗶𝘃𝗲 𝗪𝗲𝗮𝗿 𝗕𝘂𝘀𝗵𝗶𝗻𝗴 𝗟𝗶𝗽 𝗦𝗲𝗮𝗹𝘀 𝗮𝗻𝗱 𝗗𝗼𝘂𝗯𝗹𝗲-𝗟𝗶𝗽 𝗦𝗲𝗮𝗹𝘀
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I agree that using a double-lip seal shouldn't make any difference, but I do not know for sure, and I certainly do not know as much as the original designer. The only reason I wouldn't do it is: That even though double-lip seals were available when the C-drive was designed, they were not used by the original designer. This double-lip suggestion was made before in this Group as a potential method of increasing the C-Drive Wear Bushing seal efficiency. It was discussed at length. There were certified engineers involved in the discussion and the bottom line was that it would not help. I am going to rile a few people who were originally involved in that discussion and say the lack of C-Drive Wear Bushing sealability experienced by some owners has nothing to do with the lip seals, and everything to do with the procedure followed by them or their mechanic. These are the common errors I have seen. These are not in any order, but each, if not done correctly, will allow water to egress and/or oil to escape.
I wonder if Amel would have changed to supplying double-lip seals under previous management. I also wonder if the person that made the decision to supply double-lip seals took the easy way out when asked about double-lip seals. I am betting that the person making this decision cannot give a complete answer to "why did you change to double-lip seals?" And, more importantly, if this change causes an issue, is Amel going to stand behind the use of this decision to change? I'll never know the answers to these questions. If anyone wants a copy of the C-Drive service procedure, let me know. If anyone else besides Mike has received double-lip seals, please let me know. Bill
On Sun, Feb 26, 2023 at 1:58 PM Mike Longcor (SV Trilogy) <svtrilogy53@...> wrote:
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Uh, Bill... what's the difference between the identical 3rd party lip seal purchased from Amel vs. that identical lip seal purchased (likely for less) from another vendor? If the answer is we all want to support Amel SAV and have them be profitable even if they charge a bit more, I won't argue. But it is the exact same product and manufacturer regardless of who sells it.
--Cheers Craig Briggs - s/v Sangaris / SN68 Tropic Isle Harbor, FL |
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Neil Meyrick
Bill after reading this I just pulled out the bearing and set of seals that Amel sent me just a couple of weeks ago. Comparing them to a lightly used set in boat's stores, I can see that the new seals do have a second lip on the inside diameter, on the side opposite the steel spring and I assume are what are being referred to as double lip.
I've attached a photo showing the old used seal on the left, and brand new supplied by Amel on the right Thanks Neil |
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Yes, that is a double lip. The only reasonable explanation is that Amel has historically used the same seal that they used on the c-drive on the newest version of the main furling & outhaul motors which they began installing in the middle of the A54 production. I can understand why they would want a dust seal. I have written SAV and hopefully will get an answer which I will share with you. Bill
On Mon, Feb 27, 2023 at 7:23 AM Neil Meyrick <Nmeyrick@...> wrote: Bill after reading this I just pulled out the bearing and set of seals that Amel sent me just a couple of weeks ago. Comparing them to a lightly used set in boat's stores, I can see that the new seals do have a second lip on the inside diameter, on the side opposite the steel spring and I assume are what are being referred to as double lip. |
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As others, after reading this I checked my stock.
Wearing ring and seals purchased February 2020 have the double seal as in the photos. I never noticed this but clearly it's not a recent development. From a mechanocal perspective, I can't see it would do any harm in fact it may work better than a single seal. Cheers Alan Elyse SM437 |
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Hi all, |
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Neil Meyrick
Thanks Bill - as always your support of this community is invaluable!
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Answer from Maud SAV@... :
Thank you for your message. All the lip seals for the bronze shaft bushing are the same and have not changed as far as I know.
If they have any questions, my customers can directly take contact with me. -- |
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Maybe this will help. Do you have a Double Lip Oil Seal?
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Neil Meyrick
Thanks Bill, that is helpful. I would say the seals I received from Amel look more like the single lip with dust shield, the second seal is more of a wiper blade as shown here, and does not have a separate indent or an internal spring as shown on the true double lip seal.
The older seals I have on the boat do not have this separate dust shield, but I'm unsure whether they had been supplied by Amel or sourced separately. Thanks Neil |
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jlm@jlmertz.fr
Hello... If you put 3 double lips seals in the C-drive it is very important to bring oil (80-90w) between the 3 seals, Best run on gold speedy-sleves from skf ... For double lips on bow-thruster you can decrease the length of the spring sea watter side by 2-3mm to increase the force on the seal lips. I run on speedy-sleves.. JLMERTZ CottonBay
Le 28/02/2023 à 15:44, CW Bill Rouse a
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JLMERTZ I would never recommend such a modification. Best, CW Bill Rouse Amel Owners Yacht School +1 832-380-4970 | brouse@... 720 Winnie, Galveston Island, Texas 77550 www.AmelOwnersYachtSchool.com
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Mike Longcor (SV Trilogy)
Hi Bill, all, Seals with a dust lip and a garter spring lip are often called double lip seals. This is what Amel sent me most recently. I have older seals onboard that I believe were also supplied by Amel several years prior and those are true single lip seals (no dust lip, garter spring lip only). The double lip seal photo you sent might be called a bidirectional seal or double spring seal? Sorry for any confusion here. Cheers, Mike Longcor SV Trilogy SM23 NZ On Wed, Mar 1, 2023, 3:44 AM CW Bill Rouse <brouse@...> wrote:
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