Ford 5000 knock

I have a 1973 Ford 5000. I was blowing snow with it this weekend and was pushing it a little, working it hard. Suddenly, it lost power and stoped. I thought I had caught something up in the blower but it started right back up and there was nothing in the blower. It now has a knock coming from the area of the head. Also seems to use more fuel. Could I have developed an injector issue and could an injector cause the knock? Runs fine otherwise ans doesn't seem to knock under power or at higher RPMs.

A bad valve(s) will act up when it's been pulling hard. Then it will start right back up.

It could be out of adjustment and when it gets hot it doesn't seat properly and can cause a burnt valve or a sticking valve, or slightly bent valve touching the piston when it comes up.

I would also pull your fuel injectors out and have them tested. You may have one that lost a tip causing the knock.

These are just a few things I've seen thru the years.

stuck injector?

Could be an injector... could also be plunger springs in the pump... or an internal problem in the engine. Blown piston, burned valve, etc. Usually a burned valve will make a sput/sput from either the exhaust or intake depending on which one is burned.
I'd start by cracking injector lines open one at a time at idle and listen to see if there's a change in tone or drop in speed with the line open. When you find one that doesn't cause a change, or as much change, you found the problem cylinder. At that point you want to pull an injector or two and either do a compression test or swap the injector to another cylinder and see if the problem follows the injector or stays in that hole. If it follows, then the injector is at fault. If it doesn't follow... then you do a compression test on that hole and see if it's got 350 psi or so...
Given the description I think you'll find a bad injector or a tip blown off. If that's the case it could be dumping fuel into that cylinder while you're running it... and washing the walls down... and mabey accumulation fuel in the base oil... so don't continue running it until you know what's wrong at least.


Rod

Thanks or the diagnosis! This is a nice solid tractor and one I enjoy everytime I get on her. The knock is a combination of a knock and a click, I'll do some diagnosing when it warms up a bit. Below zero and windy today, don't even want to start her up today.

I had this happen a couple years back. One second it was running almost wide open under load and a second later dead. Tried the starter and the engine was tight. After about ten minutes it fired up and I drove it into the shop with a slight knock. I was just what I thought it would be but, I couldn't believe it. My dad flushed the radiator every spring and fall but, crud built up between the back cylinder and the block. Under a heavy load, it couldn't cool in that spot and it went tight. When it cooled down, it loosened up and ran. The sleeves showed very little wear inside but, number 6 had siezed and released. It got a complete overhaul anyway.