Handling Cylinder Cutout Mode Operation - Komatsu PC88MR-10 Shop Manual

Handling cylinder cutout mode operation

a The cylinder cut-out test mode operation means
to run the engine with the fuel injectors of one or
more cylinders disabled electrically to reduce the
number of active cylinders. The purposes and
effects of this operation are as follows.
1. This mode is used to find out a cylinder which
does not output power properly (or, combustion
in it is abnormal).
2. When a cylinder is selected for Cylinder Cut-out
Mode operation, if the engine speed and output
do not change from the normal operation (all-
cylinder operation), that cylinder has one or
more defects.
The following problems can be considered:
Compression leak from cylinder head gasket
Defective injection from injector
Defective piston, piston ring or cylinder liner
Defective valve mechanism (valve operating
system)
Defective electrical system
3. The injector of each cylinder is separately
controlled electronically in the common rail fuel
injection system, so the cylinder cut-out test can
be performed easily by the simple operations of
the switches compared with the mechanical fuel
injection system. This allows to find out a
defective cylinder easily.
PC88MR-10
30 Testing and adjusting
Engine and cooling system
(PC400-AD00-34F-K-00-A)
30-23