2.
Turn
the
cyllnder heod
ihe rlght ray and tap
'the
valve
s+em unill
the
seat
rlnq congs loose.
f. Claan the seat
rlng
posltlon
In the
head. Befor€ tlttlng a n€r, seat rlng,
rlng
rlth llquld nlirogen. Let
th€
doin In n lirogen
uni | | f
I zz Ing around
4. Tap
the ssa+ rlng ln
plöce
wlih
ö
drlft
and nachlne th€ ssailnq fac€.
cyllnder
coo I
the
rlng
coo
I
ll siops.
su ltab le
Icrtcl
lJ
requlred,
the
standard
lniec'tor
sleeve cän
be roplaced
by one rlth
0,4
||m
overslze top. B€fore
lns+alllng the sleeve,
machlne
the cyllnder head upper
gulde
bore
+o
ö
0,4
m blgger
slze.
The c.d€r
nunber for ihe
overslze Injec+or sleeve ls 8160
f8721.
F.
llÄo{lNl}c
THE VALVE
SE T
t4achIne fhe
domaged valvo sea+
uslng
valve
ssöi
cutters 8160 97454...91440
or use a valve sect
grinder.
lf the seat surface ls {lder lhan 1,5
nm, närrow lf
olthe. lrom the
outer
or ihe
inner ed9e.
The lncllna+lon of ihe valve
seat
surJace ls
Joo.
REPLAC
II{G TIIE Y^LVE
SEAT
R
I NG
The
Jll and 4ll
englnes of
hlgher
output and
all 6ll and 612
englnes are furnlshed rllh
separate valve
seöt rlngs.
lf
the
seallng
surface ls so
torn that ll
canno+ be lrDroved
by machinlng,
repl6ce the
seai rln9.
Grlnd
+he
hsad ot fhe rejected valve
so tha+
lt
flis ln+o
the seai
rlng. Fli
+he valv6 ln
posl+lon
and *eld
lt io fhe
seai rlnq.
Cool the
eeld
r lih r at*.
Nofel
ll
needed, a s+andard seai rlng can
be
replaced
nl+h a rlng tilih |rlder ouislde
dlameier.
Seai
rlnqs
for bofh Inle+
and
exhaust
valvos
ar6 dealvered
In tto overslzes.
313
See
Technlcal data,
polnf
cyllnder
head.
H.
GRINDIIIG
I}C YALVES
315
It
necessary, stralgh+en
and
clean
+he
matlng
surface of
th€ InJec+or seallng
washer
In lhe
cy I
I
nder head
H
lfh
a
r€amer
(
8161 974?0
).
t.
To
ensure max
ilghiness
betHeon +ho
valve
önd
th6
seat,
ihe
dlffgrence
In
lncllnatlon
bgtre€n
seallng
surfaces
ls 0,50. Thls
mokes
a verv
na.row
seallng
surface
whlch
se6ls
better
ihan
a wlde
one, evon
yhen
worn.
ll ihe
valvo
head
ls
domagod,
ireoi
lt
In the
grlndlnq
machlne.
AdJust
fhe grlndlng
nachlna
to
29,54.
Do
no+
grlnd
fllore
than
ls
necessarv
io
clean
the
contaqi surtace.
lf fhe
valve
head outer edge
thlckness
remalns
under 1,5
mn,
replaco ihe
valve.
It the
valve
stem l-op
has rorn
hol
lor,
lgvel
lt
by grlndlng.
'14
c)
o
66
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