Handle Cylinder Cut-Out Mode Operation - Komatsu PC500LC-10R Shop Manual

30 TESTING AND ADJUSTING

HANDLE CYLINDER CUT-OUT MODE OPERATION

The cylinder cutout 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 cylinder cutout mode
operation are as follows.
• Cylinder cutout mode operation is used to find out a cylinder which does not output power normally (or,
combustion in it is abnormal).
• If the engine speed and output do not change from the normal operation (all-cylinder operation) when a cyl-
inder is cutout with the cylinder cutout mode operation, that cylinder has a failure.
The possible failures are as follows.
• Compression gas leakage from cylinder head gasket area
• Defective injection
• Defective piston, piston ring or cylinder liner
• Defective valve mechanism (valve operating system)
• Defective electrical system
• Common rail fuel injection system individually controls the injector of each cylinder electronically , so the
cylinder cutout test can be performed easily by the simple operations of the switches compared with the
mechanical fuel injection system. So, the defective cylinder can be found out easily.
PC500LC-10R
HANDLE CYLINDER CUT-OUT MODE OPERATION
30-49