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Westerbeke 17.0KW EDE-60Hz Manuale di Installazione Pagina 40

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FUEL
INJECTORS
REMOVING
THE
INJECTORS
NOTE:
Injector
must
be
serviced
in
a
"clean
room"
emirmunent.
1.
Disconnect the high pressure lines from the injectors and
loosen the lines
at
their attachment to the injection pump
and move them out
of
the way
of
the injectors. Avoid
bending the lines.
2.
Using a 17mm long socket, remove the fuel return line in
its entirety from the top
of
the injectors. Take care not to
lose the two sealing washers and banjo bolt that attaches
the fuel return line to each injector.
NOTE:
Clean
the
area
around the base
of
the injector
prior
to
lifting it out
of
the
cylinder head
to
help prevent
any
rust
or debris from falling
down
into
the
injector
hole.
If
the
injector will not lift out easily and
is
held
in
by
carbon
build
up
or
the
like,
work
the
injector
side
to
side
with
the
aid
of
the
I
7mm
deep
socket
wrench
to
free
it and
then
lift it
out.
3. The injector seats in the cylinder head on a copper seal-
ing washer. This washer should
be
removed with the
injector and replaced with a new washer when the injec-
tor is reinstalled.
INJECTION
TESTING
1. Using the nozzle tester, check the spray pattern and injec-
tion starting
preSsure
of
nozzle and,
if
it exceeds the
linlit, adjust
or
replace the nozzle. \Vhen using nozzle
tester, take the following precautions:
A
CAUTION:
The
spray
injected
from
the
nozzle
is
of
such
velocity
that
it
may
penetrate
deeply
into
the
skin
of
fingers
and
hands,
destroying
tissue.
If
it
enters
the
bloodstream,
it
may
cause
blood
poisoning.
a.
If
the diesel fuel
of
the nozzle tester
is
discolored,
replace it.
At
the same time, clean or replace the filter.
b. Set the nozzle tester in a clean place where there is
no
dust or dirt.
c. Mount the nozzle and nozzle holder on the nozzle
tester.
d. Use
tl1e
fuel
at
the approximate temperature
of
68°
F (20° C)
e. Operate the hand lever
of
nozzle tester several times to
bleed the
air in the nozzle line, then move the hand
lever at intervals
of
one stroke per second while read-
ing the injection starting pressure.
INJECTOR
START
TO
INJECTION
PRESSURE
1991
-2134
psi
(13.73
-14.71
MPa)
Inspecting
Spray
Pattern
1.
Operate the hand lever
of
the nozzle tester at intervals of
one stroke per second to check
if
the fuel is injected cor-
rectly
in
its axial direction. A nozzle is defective
if
it
injects fuel in an oblique direction or in several
separate
strips. Also, a spray
in
the fonn
of
particles indicates a
defect. These defects may sometimes be caused
by
clog-
ging with dust and, therefore,
ali pmts should be cm·efully
cleaned before reassembly. (Care should be taken not to
expose ones skin to this spray as it may penetrate the skin
and cause infection.)
~
~
1
,rr
1
NORMAL
j
1
1r
•/rill
lrriJ
1
:J!l;\
td
~
~~~
;:•
FAULTY
Ill
'
¥~~
.-~~
CHATTERING
TEST
~
ll
"
!;,
,FAULTY
\.
II
~I
,,,
I"
...
2.
Apply the pressure
of
1635lb/in
2
(115 kg/cm
2
)
to
nozzle
by operating the hand lever, and check the drips from the
nozzle tip.
If
it
drips or has a large accumulation
of
fuel
on the bottom, it is considered defective and should be
repl!lced. A very small amount
of
fuel may sometimes
remain on the tip
of
the nozzle; however, tins does not
indicate a defect.
hOI
DRIP
TEST
The injection starting pressure for the injectors is adjusted
by
increasing or decreasing the tlllckness
of
the adjusting shim.
TI1e
shim has I 0 different tlllcknesses for every 0.0020
in
(0.05
rnrn)~
between 0.0049in (1.25mm).to 0.0669in (1.7mm)
With each
0.0020in
(0.05mm) increase, injection pressure is
increased approximately
7l.llb/in
2
(5.0 kg/cm
2
).
\Vhen
replacing
tl1e
shim, grip the retaining nut in a vise and
remove
ti1e
body with a wrench. Tighten
ti1e
retaining nut to
the specified torque;
INJECTOR
TO
CYLINDER
HEAD
TIGHTENING
TORQUE
36.2-
50.6
(49
-
68.6
Nm)
TYPICAL
INJECTOR
ADJUSTING
SHIM
!
SHIM
THICKNESS
PRESSURE
VARIATION
WITH
0.01
mm
(0.004
in)
ADJUSTING
WASHER
IS
34
PSI
(235
KPa)
. I
Engines
& Generators
30
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