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Yangdong Co. Y90 Series Spezifikationen Seite 20

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Seitenansicht 19
Fig. 1 Adjustment
of
valve
lashes
SECTION.4 ENG'INE ADJUSTMENT
I .
Ad.iustment
of
Valve
Lash
When
.the
en~ine
is nlaintained and repaired,it is necessary ·to
check
and,
adi~st
the valve
lashes.The
recommended Jnethod
of
a4iusting the
valve
system
and
valve lash is as follows:
I.Remove the, cylinder head cover.Check and
tighten the nuts fastening the rocker arm shaft
stands.
2.Tum
the crankshaft to make sure that the
piston
of
1st
cylinder
is
at
the compression.
TOe
position.The timing mark on the inspection window
of
the fly\vheel housing exactly points to the "
0'"
1l1ark
~n
the flywheel
rim
,or
the"
0"
mark on the
c.rankshaft puJleyis
ali~ed
\\,ith the pointer on the
cover oftHning gear housing.
3. slip a feeler gauge bet\;veen the rocker arnl
and
the tip
of
the intake
or.
exhaust valve stems
of
the
1st
cylinder
respectiv\;~ly
to check and adjust the
valve lashes.fntake
-valve
lash'
and exhaust
valve
lash
in
cold
nlust
be
the
value
specified
in section
I.Then
after
turning
the
crankshaft
by
18()'J
to adjust the valve lash
of
other cytinders a(,:cording to the engine firing order( 1-'3- 4-2)for the
tour cylinder engine arid'l-3-2 for three cylinder engine.
II.
Adjustment
of
lo"iection
Timing
'ro
ohtain the most econolnical specific filet consumption and to chsure normal operation of
the enginc,injection titnin.g should be adjusted properly.For the Model 485 diesel
en~jncs,the
angle at \vhichinjection
be~ins
should be the value specified in
se'ctionl
.
The adjusting method
of
injection timing
is
as
follo~'s:
I.
Vent the air trapped
in
the fuel
system~and
turn·the crankshaft 'to fill up
the"
ini"ection
pump
wtih fuel.£)isconnect the
injection
pipe
of
the
1st
cyljnder~turn'thecranksh3.ft
slowly
in
the
direction
of
its rotation and
at
the saIne time observe
the
fuel 'level in the hole
of
fuel
pipeunion~
When
this fuel level
lust
starts
to
rise,stoptum
the
cranksha1t itnmediately.
4-1
Seitenansicht 19
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