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Using the special tool fuel
injection pipe wrench (MB992188), remove the supply pump
side
of fuel injection pipe set A and B.
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1.
caution |
- The removed fuel injection pipe can be
reassembled
up to five times. To count the number of
fuel injection 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. 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, 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 and supply pump assembly) centre axis to install
the fuel injection pipe. 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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2.Using the special tool
fuel injection pipe wrench (MB992188), tighten the supply
pump
side of fuel injection pipe set A and B to the temporary
tightening torque. Tightening torque: 18
± 2 N·m
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3.Using the special tool
crowfoot wrench (MB992211), tighten the common rail assembly
side
of the fuel injection pipe set A 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 MB992188, tighten the supply pump side of the
fuel injection
pipe set A and B to the specified
torque. Tightening torque: 35 ± 5
N·m 5.Using the special tool
MB992211, tighten the common rail assembly side of the fuel
injection pipe set A 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)
6.Check that no
fuel is leaked from the fuel injection pipe connection
area.
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