140-3 SERIES
12-15
TESTING AND ADJUSTING REDUCED CYLINDER MODE OPERATION
REDUCED CYLINDER MODE OPERATION
★ Reduced cylinder mode operation means setting
the fuel injectors of a single cylinder or multiple
cylinders electrically to the NO INJECTION con-
dition to run the engine on a reduced number of
cylinders. It has the following purposes and ef-
fects.
★ The reduced cylinder mode operation must be
carried out when the engine is mounted on the
machine.
In addition, when carrying out reduced cylinder
mode operation, it is necessary to operate
switches or the panel on the machine mounting
the engine, so see the shop manual for the ma-
chine for details of the method of operation.
1.
The reduced cylinder mode operation is used
when it is thought that one of the engine cylin-
ders is not giving normal output (combustion). It
is a method to determine which cylinder is not
operating normally.
2.
With the reduced cylinder mode operation, if
there is no change in the engine speed and out-
put from the present condition (engine run on all
cylinders), even when a cylinder is set to NO IN-
JECTION, it means that this cylinder is the cause
of the problem.
Such problems may occur for the following rea-
sons.
• Leakage from cylinder head gasket
• Defective injection by the fuel injector
• Defective piston, piston ring, cylinder liner
• Defective valve mechanism (dynamic valve)
• Defective electrical system
3.
With the common rail type fuel injection system,
the fuel injector for each cylinder is operated in-
dividually by electronic control. So compared
with the mechanical type fuel injection system, it
is possible to carry out the reduced cylinder
mode operation with simple operation of the
switches. This makes it easier to narrow down
the location of the problem.]
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