Chapter 3 Fuel Injection Equipment
7. Fuel Injection Nozzle
i4LHA Series
(3) Inspecting the stopper
Check
for scratches/wear in seals on both ends,
check
for abnormal wear on the surface where it
comes
in contact
with
the nozzle; replace if the
stop plate is excessively worn.
Hole
type
Nozzle
contact surface \ fl Pin
Seal
surface
mm (in.)
Nozzle
contact surface wear
limit
0.1 (0.0039)
(4) Inspecting the nozzle spring
Replace
the nozzle spring if it is extremely bent,
or if the surface is scratched or rusted.
7-6 Adjusting fuel injection nozzle
7-6.1 Adjusting opening pressure
Mount the fuel injection nozzle on the nozzle tester
and
use the handle to measure injection starting pres-
sure.
If it is not at the specified pressure, use the adjust-
ing shims to increase/decrease pressure.
Hole
type
Injection
starting pressure
MPa(kgf/cm
2
)
4LHA-STE/STZE/STP/STZP
4LHA-DTE/DTZE/DTP/DTZP
26.5—27.5
(270-280)
23.5-24.5
(240-250)
(5) Nozzle holder
Check
the oil seal surface for scratches/wear-
replace
if wear is
excessive.
6-5 Fuel
injection
nozzle
reassembly
The
fuel injection nozzle is reassembled in the opposite
order to disassembly.
(1)
Insert
the adjusting shims, nozzle spring and nozzle
spring seat in the nozzle holder, mount the stop
plate
with
the pin, insert the nozzle body/nozzle
set
and tighten the nut.
(2) Use the special holder when tightening the nut for
the hole type
nozzle,
as in disassembly.
Nozzle
nut tightening torque
NlkgO-m
Hole
type nozzle
39
2 - 44.1(4-4.5)
3-2-46
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