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Yangdong Co. Y90 Series Spezifikationen Seite 24

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Seitenansicht 23
.....
e-+
Fig. 4 Tightening sequence
of
cylinder
'head
.bolts
SECTION 5. CONSTRUCTION
OF
DIESEL
ENGINE
I . Cvlinder
Head
When assembling'lcylinder head··is fixed
on
the cylinder block with cylinder head-bolts.A
. torsion spanner should
be
used·during tightening the bolts.The bolts are tightened
several
times
in sequence shown in Fig.4 until they reach the specified torque limit.After
dismantlin~
and
assetnbling the cylinder
head.itis
necessary to shut
down the engine when first
wanning
up
period
is
over.
Retighten each bolt
on the
cylinder head according to
the specified value
of
torque
limit and readjust the valve
lashes.
The intake
and exhaust
valves are made
of
different materials.Each couple
of
the valve and valve seat should be ground
in'order to prevent
leaka~e.
It
is'
necessary to grind
\\-'hen
gas leaks out due to burning out,lnechanical pitting and wear
appeared
on
the sealing
fa.ce
of
valve and valve seat.When grinding,apply a grinding paste(fine
valve sand)on the conic sealing surface
of
valve.Then the valve and valve seat are lapped in pair
unit) -a even,continuous and lustreless
sealing band
appears.Itis
strictly' forbidden that the
grinding paste enters the valve guide.After lapping,clean the valve
..
valve seat and valve guide
carefully.Wearing
of
the valve guide nlay cause the eccentric
wear
of
valve sealing band which
results
in
abnormal sealing.Pour
sOlne
kerosene
or
diesel fuel into the gas passage,and observe
\vhether there
is
any leakage,then check the valve sealing.
ThesealinJZband
of
valve and valve seat is normally 1.2
....
,1.6
mm
in width.After a
lonJ;!
period
of
service and regrinding many times,the width
of
valve sealing band may get
wider~
which may cause abnortnal sealing.Being kept concentrical with respect to the valve
~uide
hole,
the contact band
on
valve seat is to be refaced by a reamer.Then gring the valve
and
valve seat
in pair.
5-1
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