Faults
61
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
Lube-oil consumption
too high
D Lube-oil quality does not meet the regu
lations
D Oil level in oil pan too high
D Leaks in lube-oil circuit especially at the
turbocharger and oil cooler
D Piston rings heavily worn
D Valve stems heavily worn, bent
D Crankcase breather clogged
D See "Fluids and Lubricants..."
D Check whether the guide tube is
correctly installed and the cor
rect oil dipstick is being used
D If coolant is discovered in the
engine oil, check cylinder head
gasket, cylinder liner gasket and
piston rings
D Remedy from manufacturer ser
vice
Gas consumption too
high
D Gas quality does not meet the regu
lations
D Ignition timing incorrectly set
D Charge mixture cooler dirty/leaks
D Charge mixture ducting leaks
D Valve seat leaks
D Air filter clogged
D Exhaust gas recirculation cooler dirty
D See "Fluids and Lubricants..."
D Check intake vacuum
D Remedy from manufacturer ser
vice
D Check exhaust back pressure
Blue smoke D Lube oil penetrates into combustion
chamber (pistons/piston rings worn or
piston rings broken)
D Turbine and compressor impeller in tur
bocharger dirty (rough running, out of
balance)
D Valve stem/guide worn
D Remedy from manufacturer ser
vice
White smoke D Coolant penetrates into combustion
chamber (cylinder head/gasket leaks)
Engine knocking D Ignition timing incorrectly set
D Valve clearance not OK
D Valves stick
D Piston pin or crankshaft bearing loose
D Piston ring broken
D Check thermostat
D Remedy from manufacturer ser
vice
Engine too "loud" D Intake or exhaust pipe leaks
D Timing gears worn, gear backlash too
large
D Valve clearance too large
D Turbine and compressor impeller in tur
bocharger dirty (rough running, out of
balance)
D Poly-V-belt slips
D Engine bearing not suitable/worn
D Remedy from manufacturer ser
vice
Exhaust temperature/
exhaust back pressure
too high (thermal over
load)
D Unsuitable exhaust piping; heat ex
changer and catalytic converter have
too high resistance
D Remedy from manufacturer ser
vice
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