Komatsu PC88MR-10 Shop Manual page 363

8. Install hose D5 to the disconnected part of the
tube on the common rail side to drain the
injected fuel into a container.
9. Return the engine parts disconnected for testing
the compression pressure to their original
positions to enable cranking.
10.Set the machine monitor to "No-Injection
Cranking" operation.
If the engine is not set to the "No-Injection
cranking" when performing the
compression pressure check, it may start
during measurement and cause personal
injury. Accordingly, be sure to set the
engine in this mode.
a Turn the battery disconnect switch to ON
position, then turn the starting switch to ON
position.
a For the method to set to "No-Injection
Cranking", see "Special functions of machine
monitor".
11.Crank the engine by using the starting motor and
measure the compression pressure.
a Read the compression pressure when the
gauge pointer stands still.
12.After finishing the test, remove the testing tools,
and restore the machine.
a Install injector (15) and spill hose connector
according to the following procedure.
1) Install O-ring (D4) and gasket (D3) to injector
(15).
a Do not fit O-ring (D4) to groove (a).
a Install gasket D3 so that it does not fall
from injector (15) due to its own weight.
Apply grease, if necessary.
PC88MR-10
30 Testing and adjusting
Engine and cooling system
2) When inserting injector (15) into the head,
apply engine oil to the O-ring and insertion
hole on the head.
3) Be sure to use a new injector holder bolt.
a Do not reuse the injector holder bolt since
the engine oil may enter into the fuel
return circuit.
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