Komatsu 170-3 Series, Shop Manual, Page: 137 / 454

170-3 SERIES
12-11
TESTING AND ADJUSTING
MEASURING COMPRESSION
PRESSURE
When measuring the compression pressure, be
careful not to touch the exhaust manifold or
muffler, or to get caught in rotating parts.
★
Measure the compression pressure with the
engine warmed up.
(Oil temperature: 40 – 60°C)
★
Since adapter assemblies F2 of the all cylinders
should be removed and installed simultaneously
for efficiency, prepare 6 sets of them.
1. Remove the cylinder head cover.
2. Remove rocker arm assemblies (1) of the all cyl-
inder.
3. Remove injector push rods (2) and injectors (3)
of the all cylinders.
★
Use a special tool to remove the injector (see
DISASSEMBLY AND ASSEMBLY).
4. Install adapter assemblies F2 to the all cylinders
and secure them with the holders.
★
Install each adapter assembly with the hole
for taking out the injector on the opposite
side of the holder.
★
Hold the adapter in position with an injector
holder.
Mounting bolt:
24.5 – 34.3 Nm {2.5 – 3.5 kgm}
5. Install rocker arm assembly (1), then adjust the
valve clearance.
Mounting bolt thread, seat:
Engine oil (E030CD)
Mounting bolt:
235.2 – 254.8 Nm {24 – 26 kgm}
★
For details, see ADJUSTING VALVE CLEAR-
ANCE.
6. Disconnect 2 large-sized intermediate connec-
tors (4) of the engine.
★
This sets so that no fuel is supplied from the
fuel pump to the injector.
7. Connect compression gauge F1 to adapter
assembly F2 of the cylinder to be measured.
➄
MEASURING COMPRESSION PRESSURE
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