Measuring Compression Pressure - Komatsu PC210-8 Shop Manual

30 Testing and adjusting
Measuring compression
pressure
a Measuring tools for compression pressure
Symbol Part No.
1 795-502-1590 Compression gauge
2 795-799-6700 Puller
C
795-790-4410 Adapter
3
6754-11-3130
k
Stop the machine on a level ground and
lower the work equipment to the ground.
a Measure the compression pressure under the
following condition.
Engine oil temperature: 40 – 60°C
q
1. Open the engine hood and remove cylinder
head cover (1).
a Since the breather connector on the rear
side of the cylinder head cover is con-
nected to the flywheel housing through the
O-ring, pull it together with the cylinder
head cover.
2. Remove the mounting bolts of rocker arm
assembly (2) on the exhaust side, and then
remove rocker arm assembly (2).
a When removing the injector, you do not
need to remove the rocker arm assembly
on the intake side.
3. Remove fuel tube (3), and then remove inlet
connector (7) in the cylinder head.
a The inlet connector is connecting the fuel
tube to the injector.
4. Disconnect injector wiring harness. Using tool
C2, remove injector (4).
PC210, 230, 240-8
Part name
Gasket
1
5. Install adapter C3 to the injector mounting part
with the injector clamp and connect compres-
sion gauge C1.
a Install the gasket to the adapter end with-
out fail.
3
Injector clamp mounting bolt:
1st time : 3.5 ± 0.35 Nm
2nd time: 75 ± 5 ° (Angle tightening)
a If a little quantity of engine oil is applied
the joint of the adapter and gauge, air
does not leak easily.
6. Install rocker arm assembly (2) on the exhaust
side and adjust the valve clearance.
a See "Adjusting valve clearance".
UEN00228-04
{0.36 ± 0.04 kgm}
11