Section.4 Engine Adjustment - YANGDONG Y90 Series Operation & Maintenance Manual

SECTION.4 ENGINE ADJUSTMENT
Fig. t Adjustment
of
valve lashes
3. slip a feeler gauge between
th,-:~
rocker arnl
and the tip of the intake or exhaust
valve steins of
the 1st cyl inder respectively to check and adjust the
valve
la~;,hcs.lntake
va.ive lash and exhaust valve
cover ofthning gear housing.
2.Turn the crankshaft to
rnake
sure that the
piston of 1st cylinder is at the conlpression TDC
position.'The tirrling nlark on the inspection window
of the fly\vheei housing
exactly points to
the '.
0"
tnark
on the tly\vhecl ritn
'!or
th{~
"
011
rnark
on
th{~
crankshaft pulley
is
aligned
\,,"ith
the pointer
on
the
I ..
-\d.iustJnent of Valve I.J3sh
When the engine is maintained and repaired.,it is necessary to check and adjust the valve
lashes.'fhe recommended nlethod of adjusting the
valve systenl and valve lash is as follows:
stands.
1.Remove the cylinder head
cover.(~heck
and
tighten the nuts fastening the rocker aml shaft
tash in cold
l11ust
be
tht: value specified
in section)
.1l·len after
turnin~~
the crankshaft by
180"
to
adjust
the valve lash of other cylinders according to the engine firing order(! - 3- 4-2)for the
four cylinder engine and' -3-2
tor
three cylinder engine.
II.
Adjustment of In
it~tion
Tiolinf,!
1\1 obtain
the
tnosl
econon1ical
specific 111ei conSllInption
and
to
ensure
norlnal operation of
th~
engineJnjection
tirning should
be adJusted properly.For the Model 485
die~el
engincs,the
ang)c
at
\vhich injection begins should be the
value
specified in section I .
'fhe adjusting inl~thod of injection timing is as
l(lllo\\'s:
1. Vent the
air trapped in the fuel system'land
t,
~ln the crankshaf-t to f111 up the injection
pUlnp \Vl!h
fuel.l)isconnect
Hle
injection pipe of the 1st cyiinder..turn the crankshaft slowly in the
direction of its rota[;on and at the satne tin1C ohserve the fuel level in the hele of fuel pipe union.
\Vhen this
fuel level iust
starts to risc'!stop
lurn
the crankshaft imtnediately.
4-1