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Belarus tractor help needed

M

moleman_alma

New User
I am looking for any suggestions for help on a Belarus 400an, air cooled, diesel engine. Initial start up is great, idles and throttles correctly. While in use it will run for an hour to 2 hours and then just shuts down. wait about 20 minutes and it will start up roughly and then come to idle great and run again for the same amount of time and shut down again. I can run tractor stationary for a couple hours with no shut down, then if I hop on it and drive it through the field then it shuts down. I pulled the fuel filters and they seem fine(it has 2). Drained fuel tank and found very little debris. Oil changed, air filter checked/clean. (oil bath with sponge prefilter). changed oil in fuel pump. fuel lines seem solid, belt's good, mechanical fuel injected. its a 1995 I believe with less than 300 hours. I don't know where to look next to see why it shuts down. Any help would be appreciated. I am located in Liberty Center, IN if you may know of a local service center, as I know these tractors are not so popular. Thanks.
 
Don't know the first thing about it, but it reminds me for some reason that in this time of year I have mice building their little winter nests, and blocking off the air flow to various things... sometimes chewing wiring. Any chance you have mice building little nests and casing problems someplace?
 
How does the fuel get from the tank to the pump?

Dip tube? Bottom of the tank? Possibly getting air, something to do with the fuel sloshing while the tractor is moving?
 

Welcome to YT
Do you have a good flow of fuel from tank to inj pump? What type fuel shut-off control does your tractor have(manual or electrical)? Is return line free of obstructions(plugging) and excess fuel is returning to tank when engine is running?
 
An insect has built a nest in the vent line? or a fuel line is collapsing on the inside? or there is more contaminates in the fuel tank, possibly rust?
 

What are you doing for the two hours driving time? Is it working or just driving with light load? If it is a light load it could be fuel obstruction, because it does not need much if not under load. I am not familiar with Belarus but this is universal. Try opening fuel line as close to inj. pump as you can and see if it will run a good stream for at least a minute. Another possibility is sucking air at a connection. I had that with one of my Fords.
 
I am ivor from uk
a few years ago I had similar problems with my old dexta it would be ok for a while but then start playing up.. I changed filter but no difference but one day I had a brain wave and I tightened the screws around the lift pump diaphragm and this cured the problem .. have you checked yours???
 
Fuel comes out of the bottom of the tank then through the fuel shut off valve. Then runs through metal fuel line to the primary fuel filter then to fuel pump. There is a little leaking coming out of the primer pump just before the fuel pump.
 
Fuel shut off valve is connected to bottom of fuel tank. I
have not checked return lines. Didn't realize there were
any til I looked at it after your post. Not too familiar
with diesel engines. But learning every day. I will check
those next. Thanks
 
Ivor,
I am not sure what you mean. Do you mean the screws that hold tighten the fuel lines for fuel connection. Thanks.
 
I tightened the 5 small screws holding the lift pump together ..if you unscrew these 5 screws the top comes off to replace diaphragm
 
I think YOU just answered the question to your problem. - "There is a little leaking coming out of the primer pump just before the fuel pump." - When the engine is running, that "leak" now becomes a SUCTION drawing AIR into your fuel prior to the Fuel Pump. As the engine heats up and the heat transfers to the Priming Pump, the size of the leak INCREASES allowing even MORE AIR into your fuel causing the Fuel Pump to become loaded with AIR instead of fuel. - AIR in a Diesel fuel system, prior to the Injectors, is your ENEMY.

:>(
 
Thank you for all of your suggestions. I did get the leak fixed around the primer pump, and decided to go from there back to the fuel tank, checking all the lines. I removed the fuel shut off valve from the tank, and realized there was another reducing flange nut screwed into the tank that the shut off valve screwed into. Attached to that nut inside the tank was long screen filter, completely covered in debris. I cleaned it up and reinstalled and the tractor ran great mowing hay yesterday. So glad it was an easy fix. Thank you all so much for guiding me to the fuel issue.
 
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