Trouble shooting table
12
Fault
Remedy
(This column is filled in only if the
”probable cause” gives no clue as
to what must be done).
Probable cause
Coolant temperature
too high, coolant loss
D Coolant level too low
D Air in coolant circuit
D Proportion of anti-freeze / anticorrosion
agent too high
D Raw water supply clogged
D Raw water supply insufficient
D Cap with working valves on expansion
tank defective, leaky
D Thermostat in closed position blocked
D Heat exchanger heavily contaminated,
pipe group coated with foreign matter
D V-belt for water pump drive not correctly
tensioned (slipping)
D Water pump leaky, defective (bearing
damage)
D Coolant circuit clogged by foreign matter
D Thermostat jammed in ”shut” position
D See ”Fuels, Lubricants ...”
D Check inlet orifice
D Impeller worn. Measure delivery
of raw water pump and vacuum
at inlet
Lube oil pressure
varies/too low
D Oil level in oil pan too low
D Oil level in oil pan too high
D Max. inclination exceeded
D Engine temperature too high
D Oil viscosity unsuitable (viscosity too
low)
D Oil in oil pan too thin (mixed with con-
densation or fuel)
D Heavy bearing wear
D Oil pump gears heavily worn
D Safety valve in oil circuit defective (does
not shut, spring fatigued or broken)
D Oil pressure gauge defective
D Dipstick marked correctly?
See Operator’s Manual
D See ”Fuels, Lubricants ...”
Lub oil pressure too
high
D Engine cold
D Oil viscosity unsuitable (viscosity too
high)
D Safety valve in oil circuit defective (does
not open)
D Oil pipes/oil galleries clogged
D Oil pressure gauge defective
D See ”Fuels, Lubricants ...”
Lube oil consumption
too high
D Leaks in the lube oil circuit, particularly
at the turbocharger and oil cooler
D Oil level in oil pan too high
D Lube oil quality does not satisfy regula-
tions
D Turbocharger wear
D Piston rings heavily worn
D Valve guides heavily worn
D See ”Fuels, Lubricants ...”
D Measure play of rotor
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