So I got the third keel cooler for the future generator (see my previous post on finding this on Craigslist) in the recessed box in the hull! I had to wait to get the 3M 101 polysulfide sealant that is recommended as my local boating store was out of stock. Once this cooler was gooed in and bolted tight, it was time to get the guard on that I had sitting up on deck for the last year. I built this guard out of 1 1/2 inch solid round bar that I had left over from making the stanchion posts. I painted it and the box with a few coats of black antifouling paint:
Thanks to my brother, Tim Fischer, for the gift of the 3/4 inch 316 stainless bolts and lock nuts. He got these for me for my birthday last year and I have been waiting ever since to use them on this project.
Here are some pictures of the recessed box when it was being made many moons ago:
Since the inlets and outlets for the keel coolers are now known inside the boat, I have started to run the piping for them. The connections to the GM 6-110 diesel engines are 2 1/2 inch and so are the connections to the keel coolers, so it only makes sense to run 2 1/2 inch piping. This is also recommended by Fernstrum, the company that makes the coolers, to maximize the coolant flow through the system. The one hiccup, is that my pipe threader only threads up to 2 inch pipe, so I have had to order 2 1/2 inch fittings that are the butt weld type. So each fitting is going to be welded on, which takes a bit more time to do.
Here is a picture of one of the first finished sections after being welded and awaiting sandblasting and primer:
Where the piping meets the engine, I have flexible high temperature silicon hose adapters and I have left a 2 1/2″ threaded tee with a threaded plug near the engine. I used a threaded tee so that I can possibly remove the plug and add a modine heater in the engine room at some later date. I also welded some 3/4 inch threaded weld-on pipe fittings so that I can add a temperature gauge, a temperature sending unit and a thermal expansion tank.
I am installing these pipes under the engine room deck plate to keep them out of the way. As some of the piping runs are kind of long (and heavy!), I am using weld-on steel flanges to join the piping sections together.
Note to self – I need to calculate the volume inside the piping, keel cooler and engine to be able to get the right sized expansion tank and enough antifreeze….