1 ENGINE
81700'82100·82400 W$M, 11770
Fuel
Tightness
of
Pump Element
1.
Remove the injection pipes and
glow
plugs, and install the
pressu
re
tester.
2.
With
the
speed
control lever at the full injection position,
turn
the
crankshaft counterclockwise (facing the flywheel).
3.
If
the
pressure does
not
build
up
to
the
fuel
injection
pressure, replace the delivery valve
with
new one and test
again.
4.
If
the pressure does
not
built
up more than the fuel injection
pressure, replace the injection pump assembly.
II1II
IMPORTANT
CD
After
replacing only pump element, the amount
of
injection
should
be
adjusted on a specified test bench.
Fuel
Tightness
of
Delivery Valve
1.
The
delivery valve
is
checked in the
same
way
as
the pump
element. Turn the flywheel counterclockwise
to
make
the
pressure gauge indicate
14.7
MPa
(150 kgf/cm
2
,
2133 psi).
2.
Set
the
FI mark on
the
flywheel
of
the
cylinder being
checked
to
the
position
at
90° clockwise
from
the
punch
mark on the rear end plate. (This lowers the pressure inside
the
delivery chamber)
3.
If
it
takes
the
pressure five
seconds
or
more
to
drop
from 14.7
MPa
(150 kgf/cm
2
,
2133
psi)
to
13.7
MPa
(140 kgf/cm
2
,
1991
psi)
the delivery valve
can
be
used.
4.
If
the
measured 'value stays
below
the
allowable
limit,
replace the pump assembly
or
the delivery valve.
Fuel
tightness
of
981
KPa
(10 kgf/cm
2
,
142
psi)
of
delivery valve
Allowable
limit
pressure drop from injection
pressure
for
5
sec.
or
more
(2) Injection Nozzle
0087F082 0087F026
(1)
Adjusting Washer
A
CAUTION
.. Check
the
nozzle
injection
pressure and
condition
after
confirming
that
there
is
nobody standing in
the
direction
the fume goes.
If
the fume
from
the nozzle directly contacts
the
human
body,
cells
may
be
destroyed
and
blood
poisoning may
be
caused.
Nozzle Injection Pressure
1.
Set
the injection nozzle
to
the nozzle tester.
2.
Slowly move the tester handle
to
measure the pressure
at
/ which fuel begins
jetting
out
from the nozzle.
3.
If
the measurement
is
not
within
the factory specifications,
disassemble
the
injection
nozzle, and change
adjusting
washer
(1)
until the proper injection pressure
is
obtained.
(Reference)
CD
Pressure
variation
with
0.025
mm
(0.00098 in.) difference
of
adjusti ng washer thickness.
Approx.
588
kPa
(6
kgf/cm
2
,
85
psi)
Fuel
injection
13.73
to
14.71
MPa
pressire
Factory
spec.
140
to
150 kgf/cm
2
1991
to
2133
psi
1-S48
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