A Few D364 Questions

That's a very interesting power plant and electric drive in a ship.

I don't believe the ship is electric drive. That appears to be the ships generator.
The D364 arrangements are:
19Bxxxx = Industrial Engine
20Bxxxx = Marine Engine
21Bxxxx = Diesel Electric Set
I don't believe they were used in any vehicular applications.

The boat's main plant is steam, as are the main generators. The Cat is a standby unit or for electrical  power when the boilers are cold and the steam generators down. According to many sources, the generator was most often used when the boat was being prepared for winter lay-up and for bringing the boat back to life in the spring. If the boat was going to be tied up for more than a couple of days, they might shut the boiler down to save fuel and run the diesel instead. One of the charts I found show this engine as using abut 15 GPH with a full load... and that's pretty decent. Probably a lot less than keeping enough steam up to run the steam generators. And less crew needed as well.

Kent gave me the build date of the engine, 1951, and it was installed in 1952 during a major refit (recip steam replaced by steam turbine). What I find most interesting is the choice of a radiator versus more typical marine raw water cooling. No doubt a cost saving choice, given the way it was planned to be used. Still, in the files of work orders for this engine, some discuss overheating issues. In one, the tech cited 127F ambient operating temps ( : < 0) as being a contributing factor... obviously referring to the generator running with the boilers lit and the engine room hot. Yeah... I can see that as a potential problem ( : < ). That's where raw water cooling would have been a saving grace.

The other diesel generator, a much smaller US Diesel  50KW DC unit , was installed in 1947 mainly to power a new electric hatch crane, is down low and maybe runs cooler. It was installed mainly to running an electric hatch crane but they also installed a DC-to-AC motor generator to provide some shipboard power. It's also radiator cooled. I did  story on the smaller generator some time back, which also has some extra history on the boat. You can read it here: Unsung Hero

The boat's main plant is steam, as are the main generators. The Cat is a standby unit or for electrical  power when the boilers are cold and the steam generators down. According to many sources, the generator was most often used when the boat was being prepared for winter lay-up and for bringing the boat back to life in the spring. If the boat was going to be tied up for more than a couple of days, they might shut the boiler down to save fuel and run the diesel instead. One of the charts I found show this engine as using abut 15 GPH with a full load... and that's pretty decent. Probably a lot less than keeping enough steam up to run the steam generators. And less crew needed as well.

Kent gave me the build date of the engine, 1951, and it was installed in 1952 during a major refit (recip steam replaced by steam turbine). What I find most interesting is the choice of a radiator versus more typical marine raw water cooling. No doubt a cost saving choice, given the way it was planned to be used. Still, in the files of work orders for this engine, some discuss overheating issues. In one, the tech cited 127F ambient operating temps ( : < 0) as being a contributing factor... obviously referring to the generator running with the boilers lit and the engine room hot. Yeah... I can see that as a potential problem ( : < ). That's where raw water cooling would have been a saving grace.

The other diesel generator, a much smaller US Diesel  50KW DC unit , was installed in 1947 mainly to power a new electric hatch crane, is down low and maybe runs cooler. It was installed mainly to running an electric hatch crane but they also installed a DC-to-AC motor generator to provide some shipboard power. It's also radiator cooled. I did  story on the smaller generator some time back, which also has some extra history on the boat. You can read it here: Unsung Hero

I guess they would have needed to upgrade the engine room blowers to accommodate the heat given off from that radiator, in addition to the boilers. 127 is not even appropriate for engine room personnel, let alone the equipment

Possibly the conventional radiator may be due to using a packaged generator configuration.

It was similar to the standard D364 21B package, but with some differences. I found references that standard marine raw water cooling could be added to a build if desired. The generator head is a marine unit, and it's downrated a little from the standard "outta-the-box" 21B D364 diesel electric unit, which was rated at 165 KW and 215 hp. So it was a custom build to a degree. Kent has looked for the BOM and maybe he will have time to find it. That will tell the tale. It's definitely not the standard advertised D364 21B set.

Can anyone offer clues about my hour meter question?