Belarus 80.1 Operation Manual page 350

Table 7.1.1 continued
Failure,
external manifestation, cause
The engine fumes at all operation modes: blue smoke comes out of the exhaust pipe
Ingress of oil into
chamber due to wear of piston
rings, pistons, liners
Excess of oil in engine crankcase
Insufficient coolant volume in cool-
ing system
Radiator is dirty outside
Scale in cooling system due to use
of water
Thermostat valve does not open to
the full
Insufficient tension of fan belt
Oiling of the drive belt of fan and
pulleys
Oil pressure at a warmed-up engine is below the norm
Failure of sensor or indicator of oil
pressure in the engine
Failed tightness of oil line connec-
tions
Engine oil pump is out or order
Oil level in engine crankcase is be-
low the permissible limit
Drain valve of centrifugal oil filter is
stuck
Limiting wear in matching points
"crankshaft journal – bearings"
Stop the engine immediately by shutting off fuel or air feed. Remove the fuel pump from
the engine and send it to a specialized workshop to determine the cause and eliminate
the fault
combustion Replace worn-out piston rings, pistons, linings
Drain the excessive oil, and set the level at the up-
per mark of oil dipstick stem
The engine overheats
Top up coolant into radiator to reach the normal
level
Clean the radiator
Clean and rinse the cooling system from scale. Fill
the system with coolant
Replace the thermostat
Tighten the belt
Take off the drive belt, remove oil residue off the
surface of belt and pulleys
Replace the pressure sensor or indicator, if neces-
sary, after oil pressure check with a set of control
tools
Detect the tightness failure spot and restore it
Detect the failure and eliminate it
Top up oil to reach the upper mark of oil dipstick
stem
Rinse the valve and adjust pressure in lubrication
system
Eliminate the fault
The engine overspeeds
350
80-0000010B OM
Troubleshooting