sdowney717
Petty Officer 1st Class
- Joined
- Jul 16, 2011
- Messages
- 226
It has a coating of slightly sticky dirt which I can scrape off with a finger nail
This is the coolant side of the unit, not the raw water side.
Looking down into the coolant side exit there is this buildup on the tubes, which I scraped off with a fingernail. It is very soft, not scale.
Whole thing. I removed it to silver solder the drain plug pencil zinc holder. I then JB welded the ends, and will repaint it. I notice when feeling inside at the cap, it also has a coating of the same stuff, so I think it is all over the inside of it. I may use spray on oven cleaner (lye) to clean it. I know this is made with copper-nickel tubing. All the rest is copper and brass. Mostly copper.
Silver soldered this in. Sen-Dure oem had silver brazed this on, but it came loose and looked to be poorly done. This heat exchanger is from 1970, and it works without leaking. But the buildup I think will interfere with the cooling ability.
This is the coolant side of the unit, not the raw water side.
Looking down into the coolant side exit there is this buildup on the tubes, which I scraped off with a fingernail. It is very soft, not scale.
Whole thing. I removed it to silver solder the drain plug pencil zinc holder. I then JB welded the ends, and will repaint it. I notice when feeling inside at the cap, it also has a coating of the same stuff, so I think it is all over the inside of it. I may use spray on oven cleaner (lye) to clean it. I know this is made with copper-nickel tubing. All the rest is copper and brass. Mostly copper.
Silver soldered this in. Sen-Dure oem had silver brazed this on, but it came loose and looked to be poorly done. This heat exchanger is from 1970, and it works without leaking. But the buildup I think will interfere with the cooling ability.