Originally Posted by Wotname
Bony, I apologise if somehow I have derailed your thread, it has headed off down a timber hull track and I know you have a fibreglass hull
I would suggest that you don't bond your r/w valve; just replace it. It was probably eaten away because it was an unsuitable metal (say brass or poor quality bronze) or just old. Replace it with the best quality bronze valve you can source locally and keep an eye on it (along with your zincs).
No need for apologies Wotname, it has been interesting reading the comments. I read somewhere that it was advisable to bond a fibreglass boat which is why I have been looking for more info on the subject. The only timber on my boat is the marine
ply that I used to build a new cabin
and a new rudder
. My hull was made in the 1970's it is made of laid fibreglass which varies from 3/8" to 1/2 thick. It is very solid compared to modern f/glass boats
My raw water
intake was made of bronze as well as the ball valve/sea cock which was screwed to it. The thru hull
intake fitting was fine, only the ball valve was eaten away. Probably because it was an inferior bronze.
When I tried to replace the ball valve I could not find one with the same thread. I think it must have been a yanmar
intake and is obsolete now. I hunted everywhere but in the end settled for a complete new stainless steel
through hull intake and ball valve, which is now installed on the boat.
Mark said ...."The shaft and or prop zincs will NOT protect the strut, as it is not in electrical contact with them due to the rubber bearing. This is where an interior shaft brush and bonding wire to the struts interior end, are definitely called for. This way, the shaft zinc protects the strut as well.
My prop setup does not have a strut. The cutlass bearing fits into a bronze housing which is moulded into the rear of the keel
. On the inside of the boat the propshaft passes through a 1 3/4" f/glass stern tube and the end of the tube fits into the stuffing box bellows. You can see the propshaft housing and the new raw water
intake in the accompanying photo
I could use some advice on how to bond the propshaft to the prop housing so that everything is protected.
Thanks for the interesting replies,