JUne 26 UPDATE
I fully disassembled the entire motor and too back to machine shop. All parts within tolerances. All piston end gaps good. The cam plugs are tightly in place. Before putting it back together I staring blowing out all passages in the block and noticed no air at port for oil pressure sensor. As some may recall from earlier, I had an oil leak at the back of the engine the first time I tried to start. There was a missing plug in an oil galley port at the back of the block after receiving from machine shop. So I found this "missing" oil plug screwed into the hole for the oil sensor. It was in far enough I could thread in the oil sensor so far I did not realize what was happening. THUS, I HAVE OIL PRESSURE - THAT IS NOT A PROBLEM.
When reassembling this time, I believe that I had the crankshaft timing one cog off before. I found the dot to align with the idler gear under a thin flat washer. Last time, I could not see it and just tried to bring the front (#1) piston to TDC, but now believe I was off one cog. Anyway, I got it all back together this weekend, built a makeshift engine stand so I could isolate it from the transmission and hydraulic lines. It started right up and idled just perfect for about 4 to 5 minutes and then died as before. Actually, before it would only run about one minute before getting hot an apparently ceasing. I did not attempt to restart, but checked the temp of the head/radiator. The head was hot, could not touch without discomfort. The top radiator hose got hotter after sitting for a few minutes but I could not feel any heat much below just the very top. I seems as though the heat was conducting through still water and not as though there is any flow of water through the system.
I did get a new head from Kumar Bros., as the old head was cracked. I thought I checked it closely to make sure it matched the original head, as I seem to recall when ordering that they did not have one that matched the parts number in my booked but they assured me it was correct. I think that the issue is in the head and a lack of any water movement allowing it to cool. I am considering pulling off the radiator and trying to flush water through the head/block with a garden hose. Anybody have any other suggestions? I may have to take the head off again just to satisfy myself that there are not mismatched / blocked ports at the block-to-head contact.
I am also curious about installion of the flywheel. The repair manual says to just install and if runout is off, then reposition flywheel. When I put it back together this time, I rotated crank until I had number one cylinder on the compression stroke based on valve position and when went a little further to approximate TDC, as I already had the head installed. I then aligned the timing marks on the flywheel to where TDC was closest to the side where it would be seen in the alignment hole of the transmission housing. Will the flywheel bolt on only when properly aligned with the crank or can it go on being misaligned? There is nothing on the end of the crankshaft, like a key, to ensure proper alignment that I can see.
I guess I am starting to recall why I have not done this in 20+ years!!
