Komatsu PC500LC-10R, Shop Manual, Page: 438 / 758

5.
Remove the rocker arm assembly (3), disconnect the in-
jector wiring harness (4), and remove injector (5).
REMARK
• Disconnect the injector wiring harness from the termi-
nal on the injector side, and pull it outside the rocker
housing. (Loosen the 2 terminal nuts alternately)
• Pass a wire under the fuel passage which is projected
sideways, and pull up the injector. (Do not pry the top
of the injector.)
6.
Install the adapter B to the injector mounting hole and con-
nect the compression gauge A.
• Be sure to fit gasket C to the end of adapter B.
• Fix the adapter B with the injector holder.
3
Holder mounting bolt:
58.8 to 73.5 Nm {6.0 to 7.5 kgm}
7.
Install the rocker arm assembly (3).
3
Rocker arm assembly mounting bolt:
58.8 to 73.5 Nm {6.0 to 7.5 kgm}
8.
Adjust the valve clearance by referring to the “TEST AND
ADJUST VALVE CLEARANCE”.
9.
After adjusting valve clearance, install intake connector (6) with clamp.
3
Mounting clamp:
10.5±0.5 Nm {107±5 kgm}
10. Install the hose D to the disconnected part of the tube on the common rail side to drain the injected fuel into
a container.
11. Restore the engine parts disconnected when removing fuel high-pressure tube (2) for testing the compres-
sion pressure, and enable the engine to be cranked.
12. Set to “No-Injection Cranking” by referring to “SET AND
OPERATE MACHINE MONITOR”.
k
Set the mode to the “No-Injection Cranking” mode.
Otherwise the engine may start and it is dangerous.
Be sure to set the engine in this mode.
13. Turn the battery disconnect switch to ON position, then
turn the starting switch to ON position.
14. Test the compression pressure when the engine is cranked
by the starting motor.
REMARK
Read the compression pressure when the pointer of gauge
is stabilized.
For standard values, see STANDARD VALUE TABLE, “STANDARD VALUE TABLE FOR ENGINE”.
TEST COMPRESSION PRESSURE 30 TESTING AND ADJUSTING
30-32 PC500LC-10R