140-3 SERIES
12-11
TESTING AND ADJUSTING MEASURING COMPRESSION PRESSURE
MEASURING COMPRESSION PRESSURE
When measuring the compression pressure, be
careful not to touch the exhaust manifold or muf-
fler, or to get caught in rotating parts.
★ Measure the compression pressure with the en-
gine warmed up. (Oil temperature: 40 – 60ºC)
1.
Remove cylinder head cover (1).
2.
Remove rocker arm assembly (2).
3.
Disconnect fuel high-pressure tube (3), then re-
move the injector wiring harness and fuel injector
(4).
★ Disconnect the injector wiring harness from
the terminal at the injector end and the
bracket at the rocker housing end, then re-
move from the injector. (Loosen the terminal
nuts in turn.)
★ Pass a wire under the fuel passage protrud-
ing to the side, then pull up the injector (do
not twist or lever the top of the injector).
4.
Fit adapter of compression gauge
D
, then
connect to the compression gauge.
★ Coat the connection of the adapter and
gauge with a small amount of engine oil to
prevent leakage.
★ Hold the adapter in position with an injector
holder.
3
Mounting bolt:
58.8 – 73.5 Nm {6.0 – 7.5 kgm}
5.
Install rocker arm assembly (2), then adjust the
valve clearance.
3
Mounting bolt:
93 – 103 Nm {9.5 – 10.5 kgm}
★ For details, see ADJUSTING VALVE
CLEARANCE.
6.
Disconnect 2 engine central connectors (5).
If the connectors are not disconnected, there is
danger that the engine may start during the
measurement operation, so always be sure to
disconnect them.
Cover the connector at the controller end with
vinyl to prevent electrical leakage or short circuit
with the ground.
7.
Measure the compression pressure when the en-
gine is cranked with the starting motor.
★ Measure the compression pressure when
the gauge indicator is stable.
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