SHOP MANUAL MT26-31 - 06.2005
Engine
Tier-3 710655-
Ch 1 page 156
Fluid stroke
Effect Cause Troubleshooting Action
Starter motor not pow-
erful enough to pull the
piston over the com-
pression stroke (if the
engine fires a connect-
ing rod could be bent)
Leaky charge air
cooler
Leaky cylinder head
gasket
Crack in cylinder head
Crack in cylinder liner
Test pressure (air
0.5 bar, liquid 4 bar)
If the fault is hard to trace:
Change all cylinder heads for exchange cylinder
heads.
(Or test pressurize all cylinder heads. Heat the cyl-
inder heads before pressurizing them.)
Water has entered the
engine via the exhaust/
intake system
Crack in water-cooled
exhaust manifold
Injector open
Knocking noise
Exhaust valves close
too late and strike the
piston crowns
Timing gears incor-
rectly meshed
The crankshaft gear
has come loose
Valve mechanism not
operating
Check the valve timing.
Rapidly increasing
valve clearances
Disturbances in the
supply of lubricant for
the rocker arms
The piston strikes the
cylinder head
Loosened big end
cap (wrong tightening
torque after repair)
Tighten to the torque
specified in the Shop
manual
Foreign objects in the
piston crown
Effect Cause Troubleshooting Action
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