jim rosenthal
Super Moderator
- Joined
- Apr 12, 2005
- Messages
- 11,050
- Hatteras Model
- 36' CONVERTIBLE-Series I (1969 -1977)
This afternoon, I was on my boat (which is hauled for the winter and covered) with a friend; he was showing me how to connect a system to flush the seawater side of the cooling system. We've had some threads about this, and basically I was asking him to show me where to open the system and route acid flush through it- whether it would be dilute phosphoric acid or vinegar. This is something I plan to do while she's out of the water.
And then he said "what's this?", pointing to a hose hanging off the back of the engine- to be precise, hanging off the back of the transmission fluid cooler.
"This" is the seawater line to the PSS shaft seal system. The fitting, which was brass, had corroded and broken off level with the outside of the cooler. The cooler has two outlets for zincs, and one was used to supply cooling water to the PSS system. I know that this was intact during the season; I don't know when it broke, but I had not been finding water back there, so it must have been recently.
Although the other fittings look good, I am going to replace all of them. The question is, with what?
I'd like to know what other members think. I have located 304 SS fittings from McMaster-Carr, and possibly 316 SS fittings as well. I THINK this is a 3/8" hose barb on one end of the fitting and 1/8" NPT on the other, but I have to measure it. I also have to use a thread extractor to remove what's left of the old fitting. I bought some thread extractors today, and I may also get a different kind- the spiral threaded ones, which weren't available where I was.
Having just replaced the bellows and associated hardware for the PSS systems, I am going to leave them in. I know that standard shaft logs don't require a cooling line, but since what I have DOES require a cooling line, I'd like to make the best choice about what material (metal or nonmetal, if metal what kind) to use in this system.
Suggestions sought and appreciated.
And then he said "what's this?", pointing to a hose hanging off the back of the engine- to be precise, hanging off the back of the transmission fluid cooler.
"This" is the seawater line to the PSS shaft seal system. The fitting, which was brass, had corroded and broken off level with the outside of the cooler. The cooler has two outlets for zincs, and one was used to supply cooling water to the PSS system. I know that this was intact during the season; I don't know when it broke, but I had not been finding water back there, so it must have been recently.
Although the other fittings look good, I am going to replace all of them. The question is, with what?
I'd like to know what other members think. I have located 304 SS fittings from McMaster-Carr, and possibly 316 SS fittings as well. I THINK this is a 3/8" hose barb on one end of the fitting and 1/8" NPT on the other, but I have to measure it. I also have to use a thread extractor to remove what's left of the old fitting. I bought some thread extractors today, and I may also get a different kind- the spiral threaded ones, which weren't available where I was.
Having just replaced the bellows and associated hardware for the PSS systems, I am going to leave them in. I know that standard shaft logs don't require a cooling line, but since what I have DOES require a cooling line, I'd like to make the best choice about what material (metal or nonmetal, if metal what kind) to use in this system.
Suggestions sought and appreciated.
