Valmet 309 - Page 106

INJECTGS
Dlslilot l{IlNG
l}E INJEcrCRS
Hash the InJectors
and
thelr
suiroundlngs
caref u I ly.
2. Renpve
the InJecilons
plpes
and
the
ovsrf lor
plPe.
Attåch ihc I nJ€cior fo !
tast
purp
and ch€d(
thr fol
lor
I ng3
-
openlng
gressure of ttP nozzle
-
creaklng chöracigrlsilcs
ond
the spray
form
-
tlghtness
of nozzle
n€€dlg ogalnsi
the seat
2.
4.
Corr# spray
form
Incorrect sprey
{orm
Bl. op€nlng
pressure
Press the tesl
pump
h6nd
levgr slorly untll
ih6
nozzle
llghily
q-eaks.
REed the openlng
pressure
In
ihe
9au90.
It
the openlng
pressurg
dlffers
from
'ihe
raflng,
the lnJector
nust b€
d
lsassembled fot- odJ usimenl.
Th6
Bosch InJec+or ls adJusted by r6plöclng
+he
shlm
(par+
2 In flgure 9
59).
The fhlckness
of
the shlms varles trom 1,00 to 1,98
ftn and
the
dlfferencg b€tw€en slzes ls 0,02
nrn. A
+hlcker
shln rolses
+he
openlng
pressure,
rhlle
o thlnner
one rgspectlvely lorers ll.
A 0,02fl1
dllference
In
ihe
shlm thlckness changes
ihe
oponlng pressure
by about 5 bar.
Because ihe
nozzle
openlng
pressure
drops
sllghtly
affer a
tex
run
hours
frcm the adJustn€nt, se+
the
openlng
pressure
at 210
!
5 brr. The
conirol
prossure
applles to both ner
and
used
I nJeciors.
B.
Open
the lnjector
retalnlng
nuts and
llfi
ihe
ln
iec'ior
anå
lts
aqJnting
lron
out
of tho
cvllnder heöd,
Ptace
piotec+
ive
Plugs
In
all
ihe connec+
ions.
Refirove
seallng
rlngs
lrdn
the cyllnder
heod'
unless
fhey
cqie off
rtth the
lniec+ors'
CHECKI }G
THE INJECTfi
N,otal
|rhen
testlng
the
Iniector
do
noi hol6
vour hand
neor
the
;ozzle,
fo-
ihe
flnely dls-
p€rsed fuel
spr6y
may
peneiraie the skln
cnd
cöuse sevore
lnjurles
!
clean
ihe
Iniactor
cårelully
rlth
cleon.lng
fluld
and brush.
Never scrope
of{
'the
carbon
wl+h
a knlle
o.
å slmlla.
fool.
The openlng
prgssure
of
adJ usled by
th6 adJustlng
the caP
nut at
tt€
+<+ ot
9
44
CAV
Injector
ls
rh
lch
I
les under
-
0-20
the
nut
942