Section H. Possible malfunctions and remedies
Belarus – 90/92 Operating manual
109
Section H. POSSIBLE MALFUNCTIONS AND REMEDIES
MALFUNCTION, SYMPTOM
REMEDY
ENGINE
Engine doesn’t start
Air in the fuel system
Bleed the system using manual fuel priming
pump. If necessary, remove air inflow. Take off fuel
pump from diesel and send it to repairs.
Engine doesn’t develop power
There is no full fuel feeding because of
disarrangement of tie-rod of control fuel pump.
Filtering element of fuel fine filter is clogged.
Nozzles are fault.
Wrong advance angle of fuel injection.
Air cleaner of engine is clogged.
Adjust control tie-rods.
Replace filtering element.
Detect fault nozzles, wash and adjust them.
Set the recommended advance angle of injection.
Carry out the maintenance of air cleaner.
Engine run at idle speed unstably
Ingress of air to fuel system.
Spring of free running in fuel system is not
adjusted.
Fuel pump is faulty.
Remove air from fuel system.
Adjust spring of free running (for diesel with fuel
pump 4UTNI o 4UTNI).
Take off fuel pump from the engine and send it to
repairs.
Engine smokes in all operation modes
А
. Exhaust tube exudes black smoke
Engine air purifier is clogged.
Needle of nozzle diffuser is hung.
Bad quality of fuel.
Faulty fuel pump
.
Make air purifier maintenance.
Find out faulty nozzle, wash o replace diffuser, adjust
the nozzle.
Substitute fuel for recommended fuel.
Dismount fuel pump from the engine and send it to
the workshop for repair.
B. Exhaust tube exudes white smoke
Engine is not warmed up.
The gaps aren’t adjusted between valves and
rockers.
Water entrapped in fuel.
The setting of fuel injection advance angle is
disturbed.
Warm up the engine, during the operation maintain
coolant temperature in the range 75... 95 °
С
.
Adjust gaps.
Replace fuel.
Set the recommended fuel injection advance angle.
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