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Belarus Tractors-cold weather starting information? Answered

Thank you for taking my question.  I purchased a Belarus tractor model 525 (65 hp. 4wd) new in 1990.  Although the tractor came equipped with glow plugs, they burned out shortly after I purchased the tractor.  I replaced the glow plugs again and they also didn't last long.  I then installed a block heater which heats the water and also a small heater from Wolverine company which actually glues on externally to the bottom of the oil pan.  Now although these products help somewhat, I was wondering if any of my good Instructable friends have had similar problems with these types of tractors and how they eliminated the problem.  The two heater items while they help, require several hours if not overnight to work.  Other than the cold weather starting problem this has been a good solid tractor.  In closing, I know these tractors are made in Belarus/Russia where the temps are far more severe than here in Southeast Missouri so I know there must be a solution.  One last thought, cold weather for these tractors is defined as any temp. below 60 degrees F.  Thanks, Debra Kay  


i just bought an old belarus 525.

We had trouble starting it too, here is what we did...

Make sure all your ground wires are tight, make sure all ur starter connections are corrosion free and same for your batteries.

After all that, it was turning over way better but still not starting. (Previous owner started it with ether every time, so it was known to be working)

Found the AC plug for what i thought was a block heater, turns out it was a fuel filter heater. i plugged that in for 10 mins and the tractor started right up!

Keeping the battery and oil warm definatley help it turn over when its cold but its the fuel itself that needs to be warm for it to spark up for you.

I know thus is a necro post but maybe someone in the future will find help with this info.

Thats about it.

Peace out.

Belarus Tractors 525

Tractor came equipped with glow plugs each plug is 1.4V together plugs 5.6V +

1.4 V glow plug indicator together 7V. Your battery is 12V.

You need additional resistor to change voltage from 12 V ti 7V .I bought resistor on

E bay from seller harp2rs. Seller know what resistor you need. Ask for glow plug resister . You can connect resistor at ate end or before glow plug resister circle.

When I had a mercedes 300D turbodiesel while living near Winnipeg, Manitoba, I found that the BEST thing I could do for starting the engine in the morning was to heat the battery. the wrap-around blanket type battery heaters are the bee's knees. You might need two of them to go around a tractor battery, and it's also very helpful to set the battery on a sheet of stiff foam insulation, and wrap it around and top with fiberglass insulation. Overkill? not if you can thereafter crank your engine up with no problems.

Also you might want to check the starter to make sure it's putting out the correct amt. of torque. My father and I had a several-months long battle with fried batteries in our Ford Diesel truck, after having the starter rebuilt not once, but twice! A new starter changed the whole demeanor of that truck. It whings right up now.

You could maybe get some kind of paraffin-heater to place under the engine something like an hour before starting.


Your tractor should start no problems without a block heater, to below freezing. The best way to check glow plugs is to remove them and connect to a battery they should glow red hot like in the photo after a few seconds. take a note of how long it takes to get red hot 10 seconds or so. If they fail to glow, or glow up near the threads replace them.
next make sure your getting power to the plugs. connect a test light and turn on the ignition, the power should stay on for 10 seconds or so. If you find the power is stay on too long it will burn out the glow plugs. Or It may have had the wrong glow plugs fitted There is a voltage stamped on the side. Its common to have 9 volt plugs as they are very quick to glow, but you have to have the right timer fitted. You could replace them with a higher voltage plug. Finally some glow plug timers don't work properly if a glow plug is burnt out, they have a current sensor and it usually makes the timer turn off early. If all else fails I agree with mpilchfamily bypass the timer and just have a button.


5 years ago

From what I read here, it sounds like the glow plugs are Current driven
until the engine begins to run.
The longer it takes the engine to start causes the glow plugs to
overheat and sometimes burn out.

I wonder if a timer control would cut back the plug current after a length
of cranking time, because obviously the plug may exceed a thermal limit
after a continuous heating period.
The plug was hot enough at the beginning and gets even hotter as time goes on.


Guy i worked with would hack the system so the glow plugs where on a separate button under the dash. Then you could hold the button down for a 10 count then start the engine up.

It's not at all uncommon in Russia to keep vehicles running 24/7 in the depth of winter.

Spares are almost unheard of so I guess this is their answer.

What lube are you running in them ?
Do they crank very slowly too ?
Are you using a low-temp diesel fuel ?

This is a common problem with all diesel engines. In the winter truckers either keep the engine running all the time or they have the heaters plugged in over night to keep the block warm. The 2 heaters you have are the best solution available short of the glow plugs. So you might as well keep the tractor plugged in all the time or keep replacing the glow plugs.

If your worried about your electric bill from the heaters then figure out the minimum time it takes to heat the block then put the heaters on a timer. Either way you have to plan ahead and get things warmed up before you want to use the tractor.