Handling Reduced Cylinder Mode Operation; Handling No-Injection Cranking Operation - Komatsu PC200-8M0 Shop Manual

SEN06127-00
Handling reduced cylinder mode
operation
a Reduced cylinder mode operation means to
run the engine with the fuel injectors of 1 or
more cylinders disabled electrically to reduce
the number of effective cylinders. The pur-
poses and effects of this operation are as fol-
lows.
1. This operation is used to find out a cylinder
which does not output power normally (or,
combustion in it is abnormal).
2. When a cylinder is selected for the reduced
cylinder mode operation, if the engine speed
and output do not change from the normal
operation (all-cylinder operation), that cylinder
has 1 or more defects. The possible defects
are as follows.
q Leakage through cylinder head gasket
q Defective injection
Defective piston, piston ring
q
q Defective valve mechanism (Moving valve
system)
q Defect in electrical system
3. Since the common rail fuel injection system
controls the injector of each cylinder electroni-
cally, the operator can perform the reduced cyl-
inder mode operation easily with switches to
find out a defective cylinder.
a The reduced cylinder mode operation is
set from the service mode of the machine
monitor.
For details, see "Special functions of
machine monitor (EMMS)", "5. Reduced
cylinder mode operation function".
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30-101

Handling reduced cylinder mode operation

Handling no-injection cranking
1 operation
a No-injection cranking means to crank the
engine with the starting motor while all the
injections are stopped electrically. The purpose
and effect of this operation are as follows.
q When a machine or engine has been stored for
a long time, implementing the no-injection
cranking before starting the engine lubricates
the engine parts and thus prevents its seizure.
a The no-injection cranking operation is set from
the service mode of the machine monitor. For
details, see "Special functions of machine
monitor (EMMS)", "6. No-injection cranking
function".
101 Testing and adjusting, Part 1
PC200, 200LC, 220, 220LC-8M0
1