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