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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...

This is, I think a common issue with the Yanmar single cylinder engines. I have seen solutions that have 6" or so of corrugated stainless flex pipe, but trying to do a 90 degree bend in a flex pipe in that space is not going to work. I have seen some implementations of that engine that have an...

There is lots of great advice on Mike Holt's forum. In many parts of my life, I have found that when an issue has lots of conflicting solutions, either there are gross misunderstandings, or incomplete, or inadequate solutions, or a poor understanding of the different use cases. I would nominate...

I think finding OEM Yanmar filters can be a challenge. It has been my experience that if you don't by the filter from a Yanmar dealer, the knockoffs are quite variable in quality and fit. YMMV... I don't have a great 3rd party source. Some of the knockoffs that I have seen had paper so porous...

Since you just worked the engine over, that does sound a bit odd, but I don't know exactly what the cause could be. That sounds like some amount of stiction (friction) on a cold injector rack. Sometimes when I get an engine that seems to be "sticky", I will put some Tuff-oil in. Yes, I know...

I don't know how much lye is in Purple Power, but it sure gets items clean. Wear skin and eye protection! I use it mainly as a pre-painting degreasing step. All the best, 2Pbfeet

First, take the gauge readings with a big pinch of salt. The value is in the right range. Temperature increases do lower the viscosity of the oil slightly, (but the effect is small, 1-2% range) and it also changes the size of small gaps in bearings. I suspect that the larger effect is that...

I agree with @Ray70. You seem to be doing the right things. Have you tried any PBblaster or candle wax or other penetrating oil? FWIW: I try to add the heat to the outer component when trying to pull a gear or fan off of a shaft. I don't know that it makes a big difference, it just seems to me...