CHECKING SHAPE
OF
FUMES ACROSS NOZZLE TIP
1.
Set the nozzle
to
a nozzle tester
and
shoot it
in
the
air.
Check the shape of the fumes.
2.
If the shape
is
defective, replace the nozzle piece.
1.
Good
2.
Bad
CHECKING FUEL TIGHTNESS OF FUEL INJECfION PUMP PLUNGER
1.
Set a pressure gauge
to
the pump.
2.
Rotate the flywheel
to
increase the pressure
to
58.8
MPa
(600 kgf/cm
2
,
8532 psi).
3.
Align the plunger with the top dead
center.
4.
Measure the time needed
to
decrease the initial pressure.
5.
If the measurement
is
less than allowable limit, replace the pump element.
In
this
case,
ask a
repair shop
to
do the replacement.
Be
sure
to
give them adjustment reference data
on
the fuel
injection pump. (Shown below)
See engine specifications.
Reference valve 8 seconds or more
Allowable limit
4 seconds
Adjustment of Injection
Control rack Speed Amount of injection
Allowance
(mm3)
position
(*1)
(rpm)
(mm3/st)
(*3)
9 1400
22.5 to 23.5
±1.5
or less
8 1400
11.2 to 26.2
±3.8
or less
7
1400 6.0 to 21.0 ±3.8 or less
o to 3.5 1550 0.(*2)
*1:
Travel
distance from non-injecting
pOint
of control rack
*2:
Zero opening pressure
and
no
injection
*3:
Allowance
on
the basis of standard cylinder
Profile
of
fuel
pump
cam
1.
Base Circle
134
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