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I think the fuse was/is a (Mersen) Ferraz Shawmut "Amp-trap" ATX-3, where the X is missing, perhaps "M" for midget (1 1/2" long)? There are eBay listings for Ferrari ATM-3 listings, if you want to look it up. e.g. https://www.ebay.com/itm/383671751698? That would have been a fast acting fuse...

They (Craig labs) do make several different concentrations, so I think that the old brain isn't so feeble. The D5 is 5%, though they also make several 100% versions (different applicators). https://caig.com/deoxit-d-series/ The D5 should do what you need, squirt it in, and with the power off...

White smoke in a diesel is generally cold fuel, i.e. not fully combusted. Often the cause is a bad injector that is overfueling a cylinder, but a cold engine can do it for a while, and I have it happen with bad rings. Overfueling in general, due to an air leak in the fuel line, or a bad...

Where else do you recommend? I did the intakes, the drain under the engine, and sealed the power feed through. The coolant drain I protected with a female brass GHT to barb adapter, with the female section flipped over to protect the hose. Anywhere else of concern? Can mice get in through the...

The third possibility is that you buy a variable frequency drive for the pump so that it soft starts. If you go that route, I would recommend filters in and out of the VFD if your well pump is a submersible pump down the well. If it is on the surface, I would put them at least on the generator...

@Guyfang Thanks! I find it interesting to see the schematic of the design of the controller. All the best, 2Pbfeet

The manual scan isn't very high resolution, so I don't think it is exactly readable. General idea, yes.

Sorry; I missed that in your first post. Perhaps a bad key switch? All the best, 2Pbfeet

The breaker is an unusual size, 16.7A, and includes a flyback diode for RF suppression, so probably a special run for the 531s. There are alternatives that are close, but not exact...I think that BlueSea makes some that are "close", e.g. 15A, and you would need to add your own flyback diode...

Sorry to hear about your issue. @Light in the Dark makes some great suggestions. Given how cold it is, is it possible that you have some fuel gelling going on and plugging the fuel filter, or fuel lines? All the best, 2Pbfeet

FWIW: The 120 to neutral three phase is also 208V hot to hot, aka WYE or zig-zag. There are several varieties of WYE -Delta or zig-zag-Delta transformers available, if the need arises. All the best, 2Pbfeet

@Jasone The lacing on one of the stator(?) windings looks like it has either been nibbled on or burned off in photo #1. It is hard to tell from the resolution of the photograph, but the varnish also looks a bit off. I could easily be wrong. I hope that all the magic smoke didn't get out. All...

Just curious, @kloppk when calibrations are performed, what do you recommend as the source of reference values? All the best, 2Pbfeet

@Lundy Could you separate this into two things? A water generator, and a general purpose generator? i.e. perhaps could a water tank be added so the main pump can run once a day on a timer, enabling the 10kW generator to come up to speed, warm up, and then have the start load dumped on it? Then...

@jimbo913 Nice borescope! Great interior photos. I enjoyed seeing them. All the best, 2Pbfeet

That's quite a collection of PS magazine bulletins! It is nice to have the wire sizes for the different terminals. Thanks! All the best, 2Pbfeet

I got some hard copper wire (18ga +/-) and bent up a replacement. It is probably easiest to do by making a bending template on a block of wood with a few small nails and cutting the tops off. The funny thing was that after running the generator for a few hours the missing one vibrated loose...

Congratulations on getting it running and purring like a kitten. I think that De-Ox-It is your very good friend for old and oxidized contacts. All the best, 2Pbfeet

FWIW: Many of these engines were designed for higher lubricity fuel that ULSD doesn't provide, so adding something similar to Optilube (pick a flavor) to the fuel will help the engine long term. For short term use, B20 has great lubricity properties, and I think that SeaFoam is great at...

If a machine has not been used in a long (long) time, it is possible to have water in the oil that starts to steam off when the engine first warms up. Is it possible the "blow by" that you are seeing is just that the oil is baking off some water? If you haven't run it at temperature under full...