Hot engine won't start?

or a bad coil / condenser... break down when hot... Since it does not DIE when hot, just not RESTART , vapor is a good guess.... Maybe start in ether ?

I had similar issues with a Chrysler product. When the engine got up to operating temp and it had run for an hour or so it wouldn’t restart until it cooled down. Found it to be a bad starter. Don’t know if this could be your problem or not.
Avery

Certainly sounds like a bad starter. Slow to turn hot usually indicates starter problem. But check all your cables and connections as well and battery condition. If that starter is 50 years old it has done well!!!! Gear reduction starter on that?? Chrysler used those a lot. 

You have thrown a lot of parts at it and none of those will cure the problem you said you had which seems to be not turning over well hot. Check your timing to see that it is correct. Too much advance could cause that same problem. Put a starter on it. Or get yours rebuilt - that may be the better option given the poor parts quality these days.

Edited by Ed (Ont) - 12 hours 38 minutes ago at 9:12pm

If you running it now it doesn't take much to throw a decent set of jumpers in with you and do a quick test if the situation arises, negative terminal to block. Reading the original post again I think this is important, as I believe the issue may be between chassis and engine. With a hydraulic pump tied in you have hydraulic lines that will conduct some electricity before they burst into flames. I have witnessed this exact thing on a S2200 IH, but it was the stainless line off the compressor that lit up. Also had a local trucker lose his truck because it was using the power steering hoses for a ground, when they carried too much current the steel braid got hot enough to ignite the rubber around it. I personally like to run the ground cable directly to the engine, and either ground from there to the chassis or run a seperate ground from the battery. Could be a starter issue, but you say it has been changed. I think if you had something in the engine getting that tight with heat you would notice it, and since friction causes more heat it would get bad enough to kill the engine in short order. I hope this helps.

Ted

Thad in AR. wrote: I’d trust a junk yard starter muck more than a new one. It took me 4 new starters to get a good one on my work truck.

I just did a search on it, that is an interesting way to pick up hay. I can see why you don't want it to not run part way through the day, you have a crew standing around unhappy. In our area the few of us that still put up hay in small bales usuall use the New Holland Harobed. My brother has a 1068 and just picked up a S1048, we put up 16x18 bales that run #90-100 in alfalfa and #75-85 in grass. I know that our area is one of the few that uses this size bale, so I find it interesting to see how it is done in other places.

Ted