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Yangdong Co. Y90 Series Spezifikationen Seite 22

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Seitenansicht 21
check
a fauly injector,i.e.loosen
the
nuts
of
injection
pipe
.from
the
injector
of
every cylinder
sl1ccessivelY,and observe
the
exhaust smoke.When the cylinder with
the
faulty iniector stops
firin~black
smoke
would
disappear.and
en~ine
speed is not appreciably affected
or
not
affected
at
al1.1t
may
also
be
checked by IisteninJ]; to
the
chattering action
of
the injector
of
every
cylinder
with
the flywheel
rotatingJf
the
distinct
clear
sharp
sound
of
certain
cylinder
could·
not
be
heard,
the
injector in this cylinder may
be
faulty.
I.Procedure
of
injector testing
and
adj ustment
(1
)Work the injector tester hand
pump
until
the
gauge pressure reaches
about
specified
injection pressure. Then operate the hand pump slowly and adjust the injection pressure
at
which injection begins.The nozzle should not show
any
signs
of
leaka~e.
If
fuel drips
around
the
nozzle tip after several tests,the nozzle set
must
be
dismantled
for
cleaning
and
winding.Then
test it again.
(2)Relnove. the lock
nut~turn
the adjusting
screw
to
get
the
pressure
at
the beginning
of
injection \vhich should
be
specified value in section
I.Then
tighten
the
lock nut,and
test
it again.
(3)Work
the
hand
pump
at
a rate
of
approximately 1 stroke
per
second
and
observe the
nozzle spray.The fuel spray should be even,and well atomized in a
shape
of
cone.At
any
cros~
section
of
the
cone
..
the atomized fuel should be finely and evenly distributed.Fuel droplets and
irregular pattern
wh~ch
can be seen by naked eyes should not be present in
the
spray.There
should be a distinct clear sharp sound at the
end
of
iniection.Generally,irregular pattern
of
the
spray is caused by needle valve seizure,fuel
dripping is generated by
damaged
conical sealing
surface
of
needle valve and spray split results froln carbon deposits
on
the
tip
of
nozzle
and
its
heat deformation.
2.1niector dismantlement and repair
( I)Before dismantling
the
injector.clean
off
the dirt gathered on it .Clamp
the
nozzle body
in a vice lined by
copper
sheets
on
its jaw \vith the nozzle
upward.I'um
off
the 'nozzle
cap
nut
and take
out
the nozzle set.Draw
out
the needle valve from the nozzle body
and
soak
it in clean
fuel oil.Then clamp the injector in
the
vice upside
down
again.Dismantle
the
adjusting nut,and
adjusting scrc\v,then take out the injector
spring and spindle.
(2)
If
the nozzle set is seized
or
clnits fuel badly,it Inust be cleaned.Soak the seized nozzle
in
the) oil for a \vhile.and
clamp
the
needle valve by a pliers \vith cloth Iined.Then rota.te and
dra\v it
out
slowly.iust to avoid
scratchin~
its surface.Decarbonize the needle valve and nozzle
body with
wooden
(~hip
soaked in fuel oil.lt is forbidden to clean theln ,"'ith
In
etaI chip.
If
the
4-3
Seitenansicht 21
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