Faults
MAN-Industrial diesel engines D2842 LE103
67
Carefully read the Operating Instructions before starting any work!
This is especially valid for the chapter on General Safety Instructions
and the safety instructions in each of the chapters.
Fault RemedyPossible cause
Engine speed fluctua
tions during operation
D inadequate fuel in the tank
D Air in fuel system
D Tachometer faulty
D Injectors faulty
Poor performance D Too much power is demanded from the
engine than it can produce
D Air in fuel system
D Fuel filter/air filter clogged
D Fuel grade does not meet the regu
lations
D Insufficient fuel supply
D Oil level in oil pan too high
D Exhaust pipe clogged
D Air intake pipe leaks
D Turbocharger leaks or faulty
D Insufficient compression in cylinder or
more than 3-4 bar pressure difference
between the cylinders
D Rated speed incorrectly set
D See "Fluids and Lubricants..."
D Fuel feed pump worn or faulty
D Check whether the guide tube is
correctly installed and the cor
rect oil dipstick is being used
D If coolant or fuel is discovered in
the engine oil, check cylinder
head gasket, cylinder liner gas
ket and piston rings
Coolant temperature
too high, loss of coolant
D Coolant level too low
D Air in coolant circuit
D Radiator very dirty, fins clogged
D V-belt for coolant pump not correctly
tightened (slips)
D Cap with work valves on expansion
reservoir/radiator is faulty or leaks
D Temperature display faulty
D Coolant pump leaks, defective (bearing
damage)
D Thermostat faulty, does not open
D Coolant lines leak, clogged or twisted
Lube-oil pressure too
low
D Oil level in oil pan too low
D Engine temperature to high
D Oil filter clogged
D Oil pressure indicator faulty
D Selected oil viscosity is inappropriate for
ambient temperature (too thin)
D Oil in oil pan is too thin (contains con
densation or fuel)
D Bearing heavily worn
D Oil pump gears heavily worn
D Safety valve in oil circuit faulty (does not
close, spring is worn or broken)
D See "Fluids and Lubricants..."
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