Here's a little update. The pig system came in a couple of days after it was ordered.
This, but not a Melling,
https://www.jegs.com/p/Melling/Melling-Pre-Lube-Engine-Oiler/1398393/10002/-1
I pulled the oil filter can. Funny thing, the filtration is a scavenging or bypass type, meaning it pulls oil from an oil rifle and dumps back to the sump. There were no holes in the center pipe for the oil to be returned to the sump, so, this has had no filtration.
I verified the passages in the filter head, center was return to sump and outer was supply from the rifle. I used a greased tap and tapped the inlet hole to 1/8 pipe and installed the luber into that port, dropped the pan, pulled the plugs and oiled the cylinders. I also installed a gauge in line with the OP sender. Filled and pressurized the luber. Opened the valve quickly, nothing, opened again, pressure on the gauge. I rolled under it and had a volunteer operate the luber, had him open the valve and I watched, after 10 seconds or so, we had oil coming between main and rod journals and bearings! Stopped the luber, installed the starter and cranked the engine with oil pressure on it, it turned MUCH faster and sounded better, the cylinders were actually hissing as the pistons came to TDC compression. We put the plugs back in to see how it cranked with a load and it turned over as I remember it did, those of you that have heard the sound of a Herc in a scout car or half track will know the sound /speed of the engine while cranking. Checked spark, we now have spark too, (it didn't before due to the high amperage during cranking, it took 400 amps to turn before, less than 100 now)!
With that done, we have no pan set yet, it is on the way, I moved on to the carb. As suspected, nasty in there. It was not drained when it was parked. The vehicle has an electric pump on it, but it is wired directly to the ign switch, I will do to this as I have done to all the other things with electric pumps, wire the pump through a switch so that when it is time to park it, the pump can be turned off and let the engine run out of gas, hopefully this will stop having to clean carbs as frequently. Parts are getting hard to find for all these old things.
Got it pulled apart, Evap-o-Rust to the rescue again! I put that stuff in an ultrasonic cleaner and cleaned the carb and parts in it. 480 seconds in the heated solution and the cast iron of the Zenith 29 was clean bare cast iron! Cleaned out all the passages and gave the body a good painting. Brent Mullins has major rebuild kits for the Zenith 29 M8 version, so I called him and have one on the way. Hopefully, next work day, we will have a running M8 again! Then I can start on the stopping part. Hope it is just a no fluid issue, We did the complete brake system a while back, well, probably 15 years ago, i'm getting old, seems like a year ago. Pics to follow.
