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800 Very hot exhaust, temp gauge normal, sputtering

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Brett24
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PostPosted: Wed Jun 26, 2019 4:31 pm    Post subject: 800 Very hot exhaust, temp gauge normal, sputtering Reply to specific post Reply with quote

I was attempting to cut hay with my Ford 800, and made it only once around a small field.

The tractor started sputtering, and was losing power, so I stopped. I dismounted from the left side and noticed that the exhaust system was much hotter than usual. I'd been monitoring the temperature gauge while I was cutting, and it vacillated between the center and just right of the center in the green (but always stayed comfortably within the green zone).

The valve cover was too hot to touch.

The radiator seemed hot, but not as hot as the valve cover.

The muffler was discolored (I assume from heat).

I checked the coolant level before I began, and then again after it cooled down, and it was still full.

So far I've checked the timing, points, cap, rotor, plugs wires, and plugs. I rebuilt the carburetor (I had the kit and was intending to do that before I started cutting). I also checked compression, and all cylinders were good and within 5 pounds of each other.

Everything looked good except the point gap was slightly off, and the coil was slightly out of spec on the secondary winding resistance. I set the points and swapped out the coil with a coil that was withing specifications.

The outside of the carburetor was dirty, but the inside was surprisingly clean.

Nothing I've done has changed anything. It runs fine at idle. Anything over idle and it gives a sputter or two every 10 seconds or so, and the exhaust gets abnormally hot. This is with it parked, and under no load.

My latest thought is that perhaps my temperature gauge is faulty, and I have a non-functioning, or barely functioning thermostat. I'm not sure how that would cause sputtering, but I'm running out of ideas.

I'd appreciate any thoughts on this.
 
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Brett24
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PostPosted: Wed Jun 26, 2019 4:48 pm    Post subject: Re: 800 Very hot exhaust, temp gauge normal, sputtering Reply to specific post Reply with quote

I forgot to mention that the fuel in the tank was bubbling/simmering right after I stopped cutting.
 
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Brett24
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PostPosted: Wed Jun 26, 2019 5:06 pm    Post subject: Re: 800 Very hot exhaust, temp gauge normal, sputtering Reply to specific post Reply with quote

Also, I checked the fan belt, and radiator fins. The belt was fine, and the fins were almost perfectly clear.
 
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murray moore
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PostPosted: Wed Jun 26, 2019 5:31 pm    Post subject: Re: 800 Very hot exhaust, temp gauge normal, sputtering Reply to specific post Reply with quote

Been there, experienced that. Did you check fuel flow when it was very hot?

I am not an expert - so my insight is questionable but i can relate.

Temperature gauges that i have bought didn't seem reliable after a year or so.

My first thought is a failing thermostat. If it's possible to get at it.... put it in a pan with water and
turn the burner and see if it opens as the temp rises.
 
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Dean
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PostPosted: Wed Jun 26, 2019 5:34 pm    Post subject: Re: 800 Very hot exhaust, temp gauge normal, sputtering Reply to specific post Reply with quote

After verifying static timing, verify that the centrifugal advance mechanism is functioning properly.

If the muffler heat shield and fan shroud are not in place, install both and avoid gasoline with ethanol if possible.

Dean
 
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murray moore
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PostPosted: Wed Jun 26, 2019 5:34 pm    Post subject: Re: 800 Very hot exhaust, temp gauge normal, sputtering Reply to specific post Reply with quote

R u running points? And have u changed the condenser?
 
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showcrop
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PostPosted: Wed Jun 26, 2019 5:44 pm    Post subject: Re: 800 Very hot exhaust, temp gauge normal, sputtering Reply to specific post Reply with quote


Get yourself one of those little infrared thermometers and find out what your actual conditions are then take it from there.
 
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marlin54
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PostPosted: Wed Jun 26, 2019 8:03 pm    Post subject: Re: 800 Very hot exhaust, temp gauge normal, sputtering Reply to specific post Reply with quote

Is this the same tractor that you had the exhaust valve insert come loose in before? and had a crack in the head?..if so that
might be the problem.
 
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Brett24
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PostPosted: Thu Jun 27, 2019 6:08 am    Post subject: Re: 800 Very hot exhaust, temp gauge normal, sputtering Reply to specific post Reply with quote

Murray-
I did not check the fuel flow when it was hot. I've theorized that if the fuel in the tank is boiling, the fuel in the line (which runs close to that overly hot muffler) would not be completely liquid.
The first thing I'm going to try is Dean's idea of making sure the timing is advancing as it should with increased RPM.
If that doesn't prove to be the issue, I'll pull the thermostat and give it the hot-water test. Thanks for the idea.
 
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Brett24
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PostPosted: Thu Jun 27, 2019 6:10 am    Post subject: Re: 800 Very hot exhaust, temp gauge normal, sputtering Reply to specific post Reply with quote

Dean-
I will check the timing advance. Thank you for that idea.
The fan shroud and muffler heat-shield are both in place.
I don't know where I could get gasoline without ethanol. (The ethanol has turned the hood of my tractor black.)
 
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Brett24
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PostPosted: Thu Jun 27, 2019 6:10 am    Post subject: Re: 800 Very hot exhaust, temp gauge normal, sputtering Reply to specific post Reply with quote

Showcrop-
I've been wanting to get an infrared thermometer anyway. Now seems like a good time.
 
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Brett24
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PostPosted: Thu Jun 27, 2019 6:11 am    Post subject: Re: 800 Very hot exhaust, temp gauge normal, sputtering Reply to specific post Reply with quote

Murray-
Yes, it has points. The condenser has probably about 100 hours on it.
That made me realize that I didn't actually know what the condenser does. This thread helped me with that: https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=nboard&th=500667
 
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Brett24
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PostPosted: Thu Jun 27, 2019 6:12 am    Post subject: Re: 800 Very hot exhaust, temp gauge normal, sputtering Reply to specific post Reply with quote

Marlin-
Wow. You have an amazing memory. Yes it is the same tractor. The head being cracked was the assertion of the surly guy at the first machine shop I visited. He hadn't even looked at the head. The second machine shop actually checked the head (with magnaflux) and found no cracks. That's the shop that replaced the seat as well.
 
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marlin54
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PostPosted: Thu Jun 27, 2019 8:33 am    Post subject: Re: 800 Very hot exhaust, temp gauge normal, sputtering Reply to specific post Reply with quote

if the gas is getting hot in tank your in a dangerous situation..dont do anything else...you better have a professional or dealer
at this point. have them check to make sure the tank is not getting hot from a failure of the heat shield ...have them remove it
and inspect it n for holes or other problems...heat could be getting past it for some reason...very important...they have to make
sure the heat from the exhaust IS NOT blowing heat on any part of tank...or lines ...its not worth blowing yourself up over the
problem..at this point only a professional SHOULD work on it...boiling gas is a dangererous situation...your dealing with
gas...stop and let a professional work on it..playing with the timing could cause a backfire and your going to get hurt....JUST
have a professional look at it..
 
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marlin54
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PostPosted: Thu Jun 27, 2019 8:36 am    Post subject: Re: 800 Very hot exhaust, temp gauge normal, sputtering Reply to specific post Reply with quote

if the gas is getting hot in tank your in a dangerous situation..dont do anything else...you better have a professional or dealer
at this point. have them check to make sure the tank is not getting hot from a failure of the heat shield ...have them remove it
and inspect it n for holes or other problems...heat could be getting past it for some reason...very important...they have to make
sure the heat from the exhaust IS NOT blowing heat on any part of tank...or lines ...its not worth blowing yourself up over the
problem..at this point only a professional SHOULD work on it...boiling gas is a dangererous situation...your dealing with
gas...stop and let a professional work on it..playing with the timing could cause a backfire and your going to get hurt....JUST
have a professional look at it..
 
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