Farmall 460lp questions

We bought one of these several months ago and it has a few small problems. First thing, I have a book coming on it but it's not here yet so I thought I might get some ideas on here.

I know i have to replace one valve at least because it will start and run with both of them closed. Also it starts and runs good until your going down the road and then it will sputter and stuff like the governor isn't working right. The points look new but I haven't changed plugs and wires yet, I'm hoping that is all it is.

Also there is a small hydraulic leak coming out on the floorboard. Looks like it is right under the area where the steering is. What is under there that could cause this? Something simple I hope. Oh yes it also has power steering.

I am wanting to get the little things fixed and maybe use it at a plow day about a month and half from now.

Any ideas?

Even if the valve are working and shutting off completely the engine will run for several minutes before it runs out of fuel. With the liquid line filled between the valve and regulator there may be enough fuel to idle for 15 minutes. Another thing about propane is that it behaves a little different than gasoline in that it will migrate based on temperature/pressure rather than just gravity. Even with just the vapor line open, if the tank is warmer than the vapor line, fuel in the line will condense until both the liquid and the vapor line are filled with liquid.

If there is a problem with the valves it could be the cause of your sputter and lose of power. Valves not opening enough can cause lean conditions. Also if you do not have enough coolant flow through the regulator/converter assembly it will cause flooding as liquid fuel enters the mixer. A restricted valve or line will cause a temperature drop at the point of restriction. Any time the pressure is reduced on the propane it will absorb heat. That is why the regulator need warm coolant flowing through it.

With propane I would not go any heat range warmer than a Champion D15Y spark plug. Propane normally can use a plug one to two heat ranges colder than the same engine running on gasoline. It also takes more voltage to fire the spark plug with a propane fuel mix versus a gasoline fuel mixture. I would gap them in the .017 - .020 inch range.

Jeff, do like I did on my 460 utility. I converted it to gas about three years ago after fighting the propane system for several years. Hope you get to come to Maples Farm this year. First pull is March 19. doorguy