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;The valve seat
must
be renew!=d jf
t11e
level
of the valve head
IS lovler than
tllat
of the cylinder head
bOttC)!11
stlrface by more
than: 3. 5 mm after the valve seat being reconditior·ed. Before a >new
.
\~alve
seat is pressed iIlto the c:vlinder
}1ead
,a illterference ofO. 086
-0. 15() m.m in
diameter shollld. be kept,
al1d
the cylinder head
~h().uldbe
Ileat((d" integrally" to abollt
2()O°C.
After.pressing t.he valve seat in. ,reall] its contact·band again
accurately to
ensur~
the
v81~.;e
seat being concentric \viththe .valve
guide ,·and meanwhile ,measure the
dista11·ce
frorll the cylinder head
botto·ro· surface dovvn
~()
the va.lve }1eaci vvrlich slloulcl be within 1. 2
-1. 6()
mrn.
If it
is tC)O
small, the accident of
valve impactil1g piston
may-
OCC1Jr.
f
,.~
If
~
r-'
1·
1
T
..J...l
l '
d
T)
1
~
\. 4)
l\:.lOlln
tln.g \-jY
1111Qer t"l.eaL1 ();lto
c~/
l1rl er [)-oc
k
..
>
1
1.
ri
1
.
1
' 1 1
"
1
t
Before IT1ouI1tlng toe
CY.tll1uer
'1ead, c
·lec~~·
the
t"atnes.s
Do&.
its
bottom surfa.ce
first.
TJ-!e allowat~le
clev'iation
( j f
the flatness
is
vlithin
o.
05
nlrll.
I,f'it'is greater
tha!l
o.
25
rnrn (in
longitudinal di-
rection) , the bottora
s~urface
sh9u1d be reconditi()rled
by means
of
scrar .
r1g~
WheYl
m6u:nting the cylinder
heac1
()[ltO
the cylinder
block,
tr1e
nuts
sholild
be tightened according to the seqllence
sho\vn in the fig. 3.· Tighten them gradually and evenly in several
times
w~ith
a torque .wrench until tIle specified torque lilnit of
12-
14 Kg - nl is reached; otl1erwise; the cylinder l1ea.d may be de-
formed,
tl1e
cylindel· head ga.sket maybe burnt out anc! even the
cylinder liner may, b.ebroken and"some other irnportarlt parts may
be darnaged ..
(S)Adjusting Decompressor's Travel
T'urn the flywheel
tl1
lift tIle pis
tOll
of ttle first cylinder up to
the top dead cerltre in its· comr'ressioll stroke, while the intake
valves 'on the first
ane!
second cylinder are closed., Turn the
29
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