fixing a sureseal stern gear set up

These are some pictures of a sure seal grease-less water cooled stern gear set up and why we wouldn't fit the device to a canal boat without all the nonsense 
as the sure seal sates it is designed to create a water trap between the Inner Bering cylinder and Prop shaft while this works in all sea craft it appears  to not work on the canal system due to the shear amount of silt in the water this clogs the main water flow up into the stern tube and also the exit pipe and therefore cannot cool the spinning prop shaft leading to excessive wear and leaking take a look at these pictures and see for your self.In the pictures you will see Excessive rust and and wear to a prop shaft thats only been used for a maximum of around 20 hours running time!


 in this 1st picture standard set up of a water cooled stern Gear

in this picture you can see rust build up already and see the signs of wear 

 this may be one reason for damage to the inner bearing tube see the rust build up under the rubber tube seal. standard greaser stern Gears would not rust here as the Grease would prevent any rusting  

 Just take a look at the mess this Prop shaft has been spinning in not good as with standard Greaser units there is no way for this to happen as they are made of Castings from Brass 

in this next pictures you can see the Inner Bearing tube witch is not made from Brass but in fact a man made fibre which can be damaged by trapped debris which the prop blade catches as the boat is in use         

 In this next picture the weld Boss is heavily  corroded now I've never seen one this bad after such a short time in a boat very rear to replace this part even on Boats as old 20years this one is less than two years old!

 as you can see in this last picture the Excessive wear to this stainless steel prop shaft the darker shades of Gray are the marks of of Excessive wearing and needed to be replaced
in our next post see the set up of a Traditional standard Brass stern Gear Set up and why we think these work so much better fitted correctly to a canal Boat