Engine
SHOP MANUAL
Ch 1 page 243
High oil consumption
Eect Cause Trouble shooting Action
Blue smoke under
load
Piston ring seizure
Piston seizure
Combustion tempera-
ture too high?
Cylinder seizure
Liner wear Unclean intake air?
Carbon polishing
(in patches)
Poor grade of oil?
Piston ring wear
Piston rings stuck
Tapered piston rings t-
ted wrong way
Broken piston rings
Individual piston rings broken = incorrectly tted
Several upper rings broken = start spray used
wrongly, wrong injection timing (too early)
Several intermediate rings broken = worn rings or
grooves
Worn valve guides
Check the clearance
between valve and
guide.
High exhaust tempera-
ture?
Poor grade of oil?
Oil level too high?
Defective shaft seals in
turbocharger
Check whether oil is
present in the compres-
sor or intake manifold
Clogged air lter
Excessive vacuum in the
air intake before the tur-
bocharger
Measure the vacuum
(max. 500 mm wc)
Check the air lter
Oil viscosity too low
Defo
rmed/incorrectly
directed piston cooling
nozzles
External leakage
Leakage in seawater-
cooled oil cooler (11-
series marine engines)
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