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| caution |
- When operating, do not support the
common rail assembly by holding the rail
pressure limiter and the pressure sensor
at both ends.
- Before the installation, make sure that
there is no foreign object or rust to
the
thread and to the high-pressure pipe
sheet surface.
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1.Install the common rail
assembly to the cylinder head, and let the mounting bolt be
seated. (until the bolt slightly touches the common rail
installation surface)
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2.
| caution |
- The removed fuel injection pipe and
supply
pump pipe can be reassembled up to five
times. To count the number of fuel
injection pipe and
supply pump pipe reassembly, record it
by adding the reassembly number of this
time (once usually)
to the previous number of reassembly
written on the maintenance handbook.
When the number of
the previous reassembly reaches 5 or
when the fuel injector assembly or
common rail assembly
is replaced, always use a new fuel
injection pipe and supply pump pipe. At
that time, write
"New (0 times)" in the maintenance
handbook.
- If a fuel leak is present in the fuel
injection pipe and fuel injection pipe
set
once, do not reuse it and replace with a
new one.
- If the fuel injector assembly, common
rail assembly or supply pump assembly is
replaced,
the contact surface (seal surface)
between the fuel injection pipe and fuel
injection pipe set,
and the other side component is changed,
do not reuse the fuel injection pipe and
fuel supply
pump pipe and replace with a new
one.
- When reassembling the fuel injection
pipe and supply pump pipe, remove the
foreign
material attached on the sealing
surface, and install it with the
contacting point of the pipe
aligned.
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Align the fuel injection pipe centre axis with the
other side components (common rail
assembly, fuel injector assembly and supply pump assembly)
centre axis to install the fuel injection
pipe No.1 to No.4. Then, tighten the flare nut temporarily
until the tip of pipe (seal surface)
contacts with the other side components.
| note |
When the fuel injection pipe
is installed, tighten the flare nut while
shaking the pipe
lightly to align the centre axis of both
components.
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3.Using the special tool
crowfoot wrench (MB992211), tighten the common rail assembly
side
of the fuel injection pipe No.1 to No.4 and supply pump pipe
to the temporary tightening torque
calculated by the following formula.
Tightening
torque: (18 ±
2) ×
{L ÷
(L +
25)}
N·m
18 ±
2: Tightening torque of the fuel injection
pipe (unit: N·m)
L: Distance between the
centre of a torque wrench drive and of its handle
(unit:
mm)
25: Length of pitch for special tool between
holes (unit: mm)
4.Using the
special tool MB992211, tighten the common rail assembly side
of the fuel
injection pipe No. 1 to No. 4 and supply pump pipe to the
specified torque calculated by the following
formula.
Tightening torque: (35 ±
5) ×
{L ÷
(L +
25)}
N·m
35 ±
5: Tightening torque of the fuel injection
pipe (unit: N·m)
L: Distance between the
centre of a torque wrench drive and of its handle
(unit:
mm)
25: Length of pitch for special tool between
holes (unit: mm)
5.Tighten the
common rail assembly to the specified
torque.
Tightening torque: 25 ±
7 N·m
6.Check that no fuel is leaked
from the fuel injection pipe connection area and the
gasket.
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