Komatsu 114E-3 Series Shop Manual page 336

SEN00464-01
36. Common rail and piping
k
Do not bend the high-pressure pipe to
collect before installing.
k
Be sure to use the genuine high-pres-
sure pipe clamps and observe the
tightening torque.
k
Install each high-pressure pipe and wir-
ing harness at least 10 mm apart from
each other.
a When installing each high-pressure pipe,
check the taper seal of its joint (Part (a):
Part of 2 mm from the end) for visible
lengthwise slit (b) and spot (c) and check
part (d) (End of taper seal: Part at 2 mm
from the end) for stepped-type wear
caused by fatigue which your nail can feel.
If there is any of those defects, it can
cause fuel leakage. In this case, replace
the high-pressure pipe.
1) Install common rail (16) temporarily with
mounting bolts (17) (Tighten the bolts by
hand).
2) Tighten drain tube (18) temporarily.
28
50 Disassembly and assembly
3) Install tube (7) between the supply pump
and common rail.
3
Nut: 37.3 ± 4 Nm {3.8 ± 0.4 kgm}
4) Install stay (15) and tighten clamp (14)
temporarily.
5) Install tubes (1) – (6) between the com-
mon rail and injector.
3
Nut: 37.3 ± 4 Nm {3.8 ± 0.4 kgm}
a When installing the tubes to the No.
1, No. 3, and No. 5 cylinders, discon-
nect the wiring connector of the injec-
tor wiring harness.
6) Tighten drain tube (18) permanently.
3
Joint bolt:
24 ± 4 Nm {2.4 ± 0.4 kgm}
7) Tighten common rail (16) permanently.
3
Joint bolt:
43.1 ± 4.0 Nm {4.4 ± 0.4 kgm}
8) Tighten clamp (14) permanently.
9) Install bellows (8).
a Set the slits of each bellows out and
down.
a The bellows are installed so that fuel
will not spout over the hot parts of the
engine and catch fire when it leaks for
some reason.
10) Fit the gasket and install head cover
assembly (9).
3
Head cover assembly mounting
bolt:
11.8 ± 1.96 Nm {1.2 ± 0.2 kgm}
114E-3 Series