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Yangdong Co. Y90 Series Dokumentacja Strona 23

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guiding
surface
of
the
needle
vaJveand
nozzle. body is
not
smooth
enougp,it
may.
be
lapped. \\lith
a.littlebitofclean
fuel oit,
th.e
n clean off
any
metaL particulates
in
clean. fue.l.While
lappj~
of
needle
valve
with
n(}ZZlebqdY,l1ever
knock
the
needle valve
~ainst
the body.
IV
•
Ad.iustmentofLube
Oil·Pressure
See fig.3.Lossen
the
lock nut and turn
the
adjusting screw with a
wrench
to take
the
lube oil
pressure within
200
~-
400kPa(in
cold
state,. the pressure
maybe
bigh~r
slightly). After
adjustment.the pressure adjusting
screw
must
be-locked
·by
the lock nut.·
v .-
Ad.iustment
of.ln.iectio·n
Pump
The
-injection
pump
has tested and calibrated
at
the'
factory.lf
it
is necessary
to
readiust,the
readjustment
must
be
perfonned in a injection
pump
test bench with ·astandard·injector
and
injection. pipes
of
standard
len~haccording
to
the
instructions
in
Operation
M.anual
of
the
Injection
Pump.
I
Fig. 3 Adjustment
of
lube oil pressore
VI
·.Adiustment
of
Decompression Arm Lash
Turn
the
crankshaft
to
make
that
the
piston
of
1st
cylinder is at the conlpressionT.D.C:. position.'I'unl
the
decolnpression
arm
to
decompression
position.IJoosen the lock nut.Turn the adjusting
screw
to
bring just into contact with
the
lock
arm
of
intake valve (Le.no valve lash).Screw the adjusting
screw
by
3/5---4/5
turns
a~ain
(nlake the
intake valve lifting
to
O.6~
O.8Inm).Then tighten the lock nut.After this
..
according
to
Item 3
of"
Adjustment
of
Valve
Lash",
make the piston
of
another cylinders at the
compression
TDC
position
one
by
one
and
adjust
by'
the
same
method.
4-4
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