Hot engine won't start?

Fix the (now) known alternator issue, replace the cables, and see if that solves the problem. Looks like it uses an electric fan, that will speed up a little too. I think if I were working on it I would get some convoluted tubing and zip ties and get some of the wiring cleaned up a little while doing it. A few extra minutes gains quite a bit of piece of mind.
Its neat to see something like that out being used, and it works for what you are doing.

Ted

Edited by TedN - 27 Jun 2025 at 10:38am

Probably not the same problem, but years ago (80's), I had a Chevy motorhome that never wanted to start when it was warm. The starter was very close to the exhaust. With the setback style of the engine, engine compartment heat was always a problem. I tried various attempts at heat shielding and only ever managed to make the problem worse. 

I would guess battery cables and ground. Get some decent ones (4 ga minimum) and clean the connections on both ends when installing. I would also run a cable from the engine to the frame/body of the machine to insure good grounding. 2nd guess would be a bad stater despite being new.

Long shot is what happened to one of my old cars that wouldn’t start when hot. For years blamed it on vapor lock. Found out that using multi weight oil it would get too thin in my well worn engine and the cylinders couldn’t pull enough vacuum to get the gas/air mixture into the cylinder. Switched to straight weight oil (30 weight) and a bottle of STP and no hot start issues since. It is a warm weather car so no need to worry about starting in cold weather.

Edited by iowallis - 25 Jun 2025 at 4:50pm

Grounding or starter would be my first suspects

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

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.

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

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) - 24 Jun 2025 at 9:12pm

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.