Engine
SHOP MANUAL MT26-31 - 06.2005
Tier-3 710655-
Ch 1 page 151
Take a reading of the oil pressure on warmed-up
engine using a mechanical pressure gauge directly
on the engine:
Minimum 1 bar at 800 r/min.
Maximum 6 bar > 800 r/min.
Defective sensor/instru-
ment
Incorrectly adjusted oil
relief valve
1 shim = 0.2 bar
Broken spring in oil
relief valve
Max. oil pressure 2 bar
at 2000 r/min
Check/remedy
relief valve
The piston in the oil re-
lief valve has jammed
in open position
Low oil pressure
Crankshaft bearing/
main bearing of wrong
size has been fitted on
reground crankshaft
Max. oil pressure 2 bar
also when engine cold
Change to bearings of
the correct size. Check
the bearing seats be-
fore assembly
Excessive play in big-
end and main bearings
If the bushing slides
all the way out of the
bearing seat, the oil
pressure warning lamp
will come on.
The engine throws out
oil through the crank-
case ventilation
Seizing in camshaft
bearings
Piston cooling nozzle
has come loose
Suction pipe to oil
pump has come loose,
the pump sucks air
Extremely low lubricat-
ing oil viscosity
Choose a viscosity that
is suitable for the ambi-
ent temperature
Worn bushings or loose
shaft in oil cleaner Change rotor if bushing
is worn oval
Change worn/damaged
shaft
Broken O-ring on cy-
clone part of oil cleaner
Defective oil pump
drive
Internal leakage in oil
cleaner
Check that the oil
cleaner is correctly as-
sembled
Gauge shows low pres-
sure
Effect Cause Troubleshooting Action
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