FUEL INJECTOR NOZZLES
(Cont'd)
Checking the Nozzles
You
can adjust the release pressure of the injector by
adding or removing spacers
(Item 1)
[AJ
at the top of the
nozzle spring (Item 2)
[AJ.
Each 0.0039 inch
(0,01
mm) spacer will change the
release pressure about 142 PSI (979 kPa). The release
pressure must
be
1920-2133 PSI (13238-14707 kPa).
Connect the injector
nozzle to the tester with the nozzle
down.
Use
tools MEL 10018 & MEL 10019.
Operate the hand lever at a slow rate and not the opening
pressure.
If the pressure
is
not correct, disassemble the injector
nozzle and add or remove spacers.
Assemble the injector nozzle and check the pressure
again.
When you
assemble the injector nozzle, tighten the
nozzle body (Item
3)
[A]
to
43-58
ft
.-
Ibs.
(59-79
Nm)
torque.
NOTE: Do
not
over
tighten,
or
slow
action
of
the
valve
will
occur.
Check for inside leakage. Operate the hand lever until the
pressure
is
almost enough to open the injector valve.
Record the pressure.
Release the hand lever. Check the pressure decrease for
10 seconds.
If the pressure decrease
is
more than 740 PSI (5102 kPa)
in
10 seconds, the nozzle is damaged.
Check that the spray pattern
is
correct [BJ.
The spray pattern is not correct if any of the
following
occur:
Fuel comes out of the side of the nozzle.
Drops of fuel are present at the nozzle.
The nozzle does not have an even flow coming from the
nozzle.
-7C-7-
A
%~~
3
~
0~
~@
~2
@
I 8-{)4103
B
PI
PI
CORRECT WRONG
Spring
Nozzle
Body
Needle
Valve
A-02621
IMPORTANT
Do
not
disassemble
or
test
the
injector
nozzles
unless
you have
the
correct
service
and
testing
tools.
1-2121-0297
A
WARNING
Diesel fuel
or
hydraulic
fluid
under
pressure
can penetrate
skin
or
eyes,
causing
serious
injury
or
death. Fluid leaks
under
pressure may
not
be visible. Use a piece
of
cardboard
or
wood
to
find
leaks. Do
not
use
your
bare hand. Wear
safety
goggles. If
fluid
enters
skin
or
eyes, get
immediate
medical
attention
from
a physiCian
familiar
with
this
injury.
W-2072-0496
741, 742, 743, 743DS
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