Stern gland hose

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BurnitBlue

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This has been mentioned before on YBW but the search function will not point to the thread. Can someone please re
mind me why I shouldn't use exhaust hose instead of whatever the correct hose is. The reason was given but I have forgortton what it was. I can buy exhaust hose no problem but nobody in the local chandler shop has heard of special hose for a stern gland.
 
http://www.ybw.com/forums/showthread.php?236411-Stern-Gland-Rubber-hose
The site search facility is not very good. Google usually comes up trumps though.
Vyv says that 'The rubber hose should not be the sole means of resisting torque between the stern gland and stern tube. Castellations, known as 'dogs', are formed at the mating ends of the stern gland and stern tube to prevent this.' Despite this warning, many installations do rely on the hose which is why radiator hose is not good.
See his sterngland page http://coxengineering.sharepoint.com/Pages/Sternglands.aspx
 
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Thanks. So the stern gland hose must withstand oil, and other contaminants. I would have thought exhaust hose could do that just as well.

Wallet out.
 
I'm afraid many chandlers are staffed and presumably run by people with little apparent knowledge of boats! As others have already said, there is a completely different set of parameters for this hose and should it fail, your boat will definitely sink. The only place I've found for specialist hoses and knowledge of their applications are rubber merchants. These guys can supply every type you may need (cheaper than the swindleries) and can also cut accurate gaskets or even build a shaped one-off, vulcanised hose for you (not so cheap).

Can't advise about Greece, but here in Hampshire I either use the local one in Reading (OK it's Berks) or the one in Southampton, near the boat. You can Google for "rubber merchants" in your area.

Rob.
 
BurnitBlue said:
This has been mentioned before on YBW but the search function will not point to the thread. Can someone please re
mind me why I shouldn't use exhaust hose instead of whatever the correct hose is. The reason was given but I have forgortton what it was. I can buy exhaust hose no problem but nobody in the local chandler shop has heard of special hose for a stern gland.
Click to expand...

Stern glands do have special hose,it's much thicker to start with, even on my 25mm shaft it has a 10mm wall thickness.
Available from http://www.tnorrismarine.co.uk/

Measure your existing hose before contacting them as it's not cheap so measure just what you need as 'you do not' have to buy it by the meter.

Mike
 
Thanks for the information. I will buy the special stern gland hose during the winter. I am just installing my new 3YM20 engine to replace the Thornycroft T90. This meant the stern gland hose had to be cut away because it was a mess repaired by previous owner with amalgamating tape. It simply fell apart with de-laminated layers. In the meantime between now and Spring I will use exhaust hose in case, in some emergency, my boat is launched. In the Spring I will replace with the correct hose.

I have always tried to winter the boat in a condition that will allow my "heirs" to launch and sell the boat should I succumb to one of the many health nasties we all hope may not happen (but one day will). Not so much gloomy thoughts though, just being practical.
 
If you are replacing the engine, why not take the opportunity to fit a modern seal. Even more peace of mind for your heirs - and a benefit you will enjoy all the time you have the boat.
 
Tranona said:
If you are replacing the engine, why not take the opportunity to fit a modern seal. Even more peace of mind for your heirs - and a benefit you will enjoy all the time you have the boat.
Click to expand...

Wow, you are the second person to suggest that. My neighbour in the boatyard also said that only an hour ago. I will definitely investigate that but I recall that I may need a new shaft because even a slight groove after 30 years will render a modern seal useless. I good advantage would be that the chandler here in Preveza can get one for me before I fly home. What do you think about a possible grooved shaft, how can I tell?

If it is grooved will it just drip or flood the boat?

I would rather go with the stuffing box than the hassle of a new shaft.
 
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Depends on where the wear is and which type of seal you choose. If it were me I would be replacing the shaft and cutless anyway in a re-engine job. Shafts are not expensive in relation to the engine and your 30 year old one owes you nothing. A new shaft and a Volvo seal plus new cutless around £300 material cost. Instead of having an old potentially dripping seal and a worn shaft with your new engine you will have a trouble free installation that will last another 30 years.
 
You are lucky if your old propeller matches the new Yanmar and the output flange on the gearbox is in the same place. Most engine change installations end up with all new bits 'cos it's easier/cheaper than fiddling about with the old ones.
 
There is a good workshop in Preveza that will make up a shaft at very reasonable cost. Ionion Marine can arrange it for you and I imagine that Cleopatra or Akti would also. I suggest you check my website, as given above by ghostlymoron, for some answers for most of your questions.
 
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