Komatsu 114E-3 Series Shop Manual page 335

50 Disassembly and assembly
35. Fuel pressure sensor and relief valve
1) Replace fuel pressure sensor (2), if neces-
sary, according to the following procedure.
a Do not remove fuel pressure sensor
(2) from common rail (1) for a pur-
pose other than replacement.
a Once the fuel pressure sensor is
removed from the common rail, be
sure to replace it.
1] Before removing the fuel pressure
sensor, remove mud etc. from around
it thoroughly and clean it.
2] Remove the fuel pressure sensor.
3] Check the fuel pressure sensor con-
nector for crack, breakage, damage
of the seal, foreign matter on the pin
and corrosion, bend and breakage of
the pin.
4] Install a new fuel pressure sensor.
2
Threaded part of fuel pressure
sensor:
3
Fuel pressure sensor:
114E-3 Series
Gear oil (#90)
70 ± 5 Nm {7.1 ± 0.5 kgm}
5] Connect the engine wiring harness.
At this time, take care not to connect
the wiring harness in reverse.
6] Start the engine and check that fuel
does not leak.
For the testing procedure, see Testing
and adjusting, "Testing fuel system for
leakage".
2) Replace relief valve (3), if necessary,
according to the following procedure.
1] Before removing the relief valve,
remove mud etc. from around it thor-
oughly and clean it.
2] Remove the relief valve.
3] If the leakage from the relief valve
exceeds the specified value, do not
reuse it.
4] Check that high-pressure seal sur-
faces (a) of the relief valve and rail
are free from damage.
5] Check that the adapter is free from
flaw.
6] Install the relief valve.
2
Threaded part of relief valve:
3
Relief valve:
100 ± 4 Nm {10.2 ± 0.4 kgm}
Excessive tightening can cause
leakage. Take care not to tighten
too strongly.
7] If adapter (4) was removed, use a
new copper washer (5) and coat the
adapter with gear oil #90 and tighten
it.
2
Threaded part of adapter:
3
Adapter:
37 ± 4 Nm {3.8 ± 0.4 kgm}
8] Start the engine and check that there
is no leakage.
For the testing procedure, see Testing
and adjusting, "Testing fuel system for
leakage".
SEN00464-01
Gear oil (#90)
Gear oil (#90)
27