Do they work? was one question I asked the sales person from John Crane Co. I think I got the standard sales line. Well they fit them on submarines, was his reply.
In use some thrirteen years and it has never given any bother untill recently. I found the black rubber half on the right needed re setting. This is done by undoing the two security clamps on the right (there is third as back up) Then sliding the seal closer to its mate, now the seal is dripless when static but does leak a tiny amount when the shaft is in gear, I assume it needs to bed in again?
In use some thrirteen years and it has never given any bother untill recently. I found the black rubber half on the right needed re setting. This is done by undoing the two security clamps on the right (there is third as back up) Then sliding the seal closer to its mate, now the seal is dripless when static but does leak a tiny amount when the shaft is in gear, I assume it needs to bed in again?
Easy to install and works a treat, a protective cover sits above the seal, the seal assembly is in its own secure space and never seen unless the boat is cleaned inside or slipped for an antifoul paint job.
In case of emergency there is a way to seal the rear rubber seal to the shaft.
The red band is a safety device which will clamp to the 35mm shaft and stop water entering the boat, the shaft needs to be locked then, a pair of Mole Vice Grips will do that job well.
Note, the faces are water cooled and a supply needs to be constant, there is an air bleed and water supply, plus the water enters via the outer shaft bearing water cooling slots. When the boat is commisioned or removed from the water, it is required to open the sealing faces and allow some sea water to feed into the seal, then thats it, nothing more required.
Recomended!
Roy
