Section H. Possible malfunctions and remedies
Belarus – 90/92 Operating manual
110
Continuation of table H-1
MALFUNCTION, SYMPTOM
REMEDY
C. Exhaust tube exudes blue smoke
Oil in the combustion chamber due to wear of
sleeve-piston group parts.
Excessive oil in engine casing.
Replace worn out parts of sleeve-piston group.
Drain excessive oil, having set level by the upper
mark of oil-measuring rod.
Engine overheats
Cooling fluid boils in radiator.
Fuel injection by nozzles has become worse.
Clean the radiator from mud and dust, when is
necessary clean cooling system from scale, adjust
fan belt tension.
Find out fault nozzles, wash, clean and adjust.
Engine suddenly stops
Fuel is not supplied.
Check if there is fuel in the tank, serviceability of
fuel lines, filters and booster pump.
Oil pressure on the warmed up diesel is below allowable value
Faulty pressure indicator or sensor.
Faulty pump of lubricating system of engine.
Oil level in engine casing is below allowable.
Sticking of bleed valve of centrifugal oil filter.
Extreme wear of crankshaft neck – bearings
junction.
Replace.
Default or replace the pump.
Fill oil to the upper mark of oil-measuring,
rod.
Wash the valve and adjust pressure.
Send engine for repair.
POWER TRAIN
CLUTCH
Clutch doesn’t transfer full torque
No free travel of the pedal.
Worn out driven disc linings.
Adjust free travel of the pedal.
Replace lining or ready-mounted driven disk.
Oiling of driven disks’ lining
Remove causes of getting oil in dry clutch
section and, if necessary, replace friction lining
or disks in assembly.
Clutch doesn’t go off fully
Increased free pedal travel.
Adjust free pedal travel.
Wrong adjustment of position of release lever.
Adjust position of release levers according to present
manual.
Oil in dry section of the clutch body
Wear of the cup, sealing the crankshaft.
Replace cap.
Wear of gaskets of clutch body.
Replace gaskets.
MAIN GEAR OF REAR AXLE
High noise in bevel gear and pinion
Adjustment of tooth action of pinions of main gear and
bearings of differential is disturbed.
Adjust gears meshing and the gap in bearings.
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