Test Compression Pressure; Method For Testing Compression Pressure - Komatsu PC500LC-10R Shop Manual

30 TESTING AND ADJUSTING

TEST COMPRESSION PRESSURE

Tools for testing compression pressure
Symbol Part No.
A 795–502–1590 Gauge assembly
B 795–471–1420 Adapter
C 6217–71–6112 Gasket
Commercially
D
available
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Place the machine on a level ground, lower the work equipment completely to the ground in a stable
posture, set the lock lever to LOCK position, and then stop the engine.
k
Check that the system operating lamp is not lit, then turn the battery disconnect switch to OFF posi-
tion.
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When testing the compression pressure, be careful not to burn yourself by touching the exhaust
manifold or muffler, or get caught in a rotating part.
Check this item under the following conditions.
Engine oil temperature: 40 to 60 °C
Refer to this section when testing the compression pressure to perform troubleshooting or periodical mainte-
nance.

METHOD FOR TESTING COMPRESSION PRESSURE

1.
Open the engine hood (19).
2.
Remove the head cover and injector. See DISASSEMBLY
AND ASSEMBLY, "REMOVE AND INSTALL INJECTOR
ASSEMBLY".
3.
Set the cylinders to the compression top dead center. See
"TEST AND ADJUST VALVE CLEARANCE".
REMARK
Check that both of the intake rocker arm and exhaust rock-
er arm at the compression top dead center are movable
the same amount of valve clearance by hand.
4.
Remove the common rail cover (1) and remove fuel high-
pressure tube (2) to be tested.
PC500LC-10R
Part name
Hose
TEST COMPRESSION PRESSURE
Q'ty Remarks
1 Pressure range: 0 to 7 MPa
1
1
1 Hose inside diameter: 14 mm
30-31