Always draw coolant from the bottom of the radiator. If only for practical reasons. A low coolant level will still have liquid at the bottom and some engines have survived with nearly no water, as long as the pump is still working.

I ended up using an automotive 12V fan, and a 12V power supply plugged into the gen output. Works like a champ on my 20/2. My 6/1 has a Honda Gold Wing radiator and fan assy. It's also powered by a 12V power supply.

Marlinpjones.com is a good place to search for surplus power supplies.

I just retired and while the listeroids are not a priority, I will spend some time buffing them up. The safety aspect becomes ever more important as we age.

OK, I'm totally impressed!

The lithium iron batteries generally are no more risky than lead-acid. I don't want to say they can't overheat, as any battery can overheat. But the electrolyte is not flammable in the same way as Lithium Ion.

https://www.youtube.com/watch?v=D8xNjz73p80

Cool setup and thanks for the pics. It's really nice to see what people are doing. Can you run your solar setup off grid?

Mine sounds like that from time to time. In my case, a spray of belt dressing quiets it right down.

The same heavy loadings that kill the upper shell in an 8/1 or SOM flywheel engine can be duplicated in a spoke flywheel 5 or 6/1 engine by having the injection timing advanced from the Lister specifications.

Correct, injection timing is critical for bearing life.

@ Cujet
 
I recall your very nice builds and frequent participation.
Re the Youtube link..... A really nicely done and well balanced movable system. Didn't you use a helicopter rotor balancing system to smooth it out?
Is it still in operation?
Does that engine use a water pump? Cheers Hugh

Yes, the engine still works great. I need to make a new fuel tank. Thinking of an integral sight glass.
Yes, the setup uses my preferred method of circulation. A brand name "Grundfos" 120V water pump. Generally the style for hot water circulation for home heating.
Yes, I use an ACES helicopter/jet engine balancer to balance the engines. It can also be done "by hand, by feel" if you know how. I put some of the clues in an old thread.

  were you one of the original fella's to make the hollow oil dippers ? I know xyzer was one as well. Was wondering if you have them installed in your engines?   

I do have the XYZer hollow dippers. So far, they are holding up. I did not make my own.

I'd love to see a video of it up and running again.

These engines really are special. With basic skills, they can be kept running nearly forever. Good job on the repair!!!!