Engine
SHOP MANUAL MT26-31 - 06.2005
Tier-3 710655-
Ch 1 page 153
Abnormal wear (liner, piston rings, etc.)
Effect Cause Troubleshooting Action
Short service life
Unclean intake air due
to leakage in intake
piping
Wrong grade of oil, pol-
ishing damage
Changing of filters and
oil has been neglected
Low coolant tempera-
ture (cold engine)
Excessive sulphur con-
tent in fuel
Change the fuel
Change to oil with a
higher base number.
Shorter oil change
intervals
Defective injector
(causes oil film to be
washed off)
High oil pressure (Engine warmed up)
Gauge indicates high
pressure
Incorrectly adjusted oil
relief valve
1 shim = 0.2 bar
Piston in oil relief valve
jammed in closed posi-
tion
Valve in oil duct to pis-
ton cooling nozzles is
binding
Defective sensor/
instrument
Take a reading of the oil pressure on the 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.
Oil viscosity too high
Choose a viscosity that
is suitable for the ambi-
ent temperature
Gauge indicates high
pressure
Effect Cause Troubleshooting Action
To Next Page
Loading...