Re: [Amel Yacht Owners] Bowthruster propeller shaft seal on SM
Thanks. Yes, always good to fall back on what the man himself would have done.
Ian and Judy, Pen Azen, SM 302 Greece
From: amelyachtowners@... on behalf of 'Bill & Judy Rouse' yahoogroups@... [amelyachtowners]
Sent: 20 March 2016 14:59
Subject: Re: [Amel Yacht Owners] Bowthruster propeller shaft seal on SM
I think that you will find that even though double lip sounds like double the sealing, it is not.
On a double lip seal only one lip of a double lip is the fluid sealing lip...and grease is required between the lips. The other lip of a double lip seal is designed to keep solid contaminants out of the sealed area. So, the design does not accomplish what you might think it does and if not installed correctly with grease between the lips, the seal will fail. Additionally, I think that you will find the lips of a double lip seal smaller than a single lip.
Double Lip Seals are the subject of many "boat/marine myth" stories perpetuated by experts at websites like Cruisers Forum and YBW...so when you research this, stay away from opinions and look for the facts.
The last thing that I will add is that if a double lip seal was better, don't you think that is what Captain Amel would have used? It is always dangerous to attempt to improve on what the Captain did.
Currently St. Lucia
On Sun, Mar 20, 2016 at 12:32 PM, Ian & Judy ianjudyjenkins@... [amelyachtowners] <amelyachtowners@...> wrote: