Valmet 309 - Page 50

l.
CoU]{IERE
L
NCE iCC}l,ANl
SH
,ll|
RE
OYITG A]O
DISASSEIALIrc THE COI'XIERBAL,ATCE
lccH
Nl sf.l
De+ach lhe englne.
Open the connecllng screws of
the lube oll
plps
of +he
coun+9rba lance assenblv and
rqnov€ the
Dloe.
open ihe flxlng screws of +he counierbalance
mechanlsm,
remove +ho assembly and
the
posslble
shlms b€ftreen ihe body and +he cyllnder
block.
4.
431
Ensure
thal'
lhe backlash
b€lween
+he
aears ls
accordlng
to
ratlng
(0,O5...0,25)
a-nd ttrai
the
@unterbalance
end
play
ls
corr€ct
(O,l
...0,5
).
FITTIT{G
TTE
CDUI{IERBAIINCE
iCCHANI
SI,t
Tap the
dorel
plns
ln ihe
body
ot the
counter-
balönce
mechan I sm.
4.
Open
the refalnlng
scref,s of the counterbölance
shat+s. Press fhe
shafis off ihe
bodv
to
ihe
di.ecilon
of
+he
retölnlno scrers. Renove
fhe
counierba
lonces
and-the +h;us+
Dlates.
5.
Clean +he
oarfs
carefully.
B. RECONDITIONI]€
IHE COUNTERBALÄNCI
IfCHAN
I SI,I
Check
ihe
shafis for wear and
ihe condl+lon
of
the counteib€lance
gears
and
bearlngs.
lf the counterba lance
gears
are rorn, rep lace
th9
cou
n+erbo
I ances. The
gears
are not supplled
separo+ely as spare
par+s.
lf needed,
press
lh6 old bearlng bushes ott the
clun+erbolånce wl+h a
suliable
drlf+. Bgfore
renova I mark
the
bush
oll
groovo posltlon
on
ihe counierb€lance.
Press the
ne'r bushes
onio
+he counferb8 | ance no+ Ing +he ol I
groove
posliion.
After flitlng machlne +he bearlng
bushes io lhelr correci dlmenslon 26,040...
26,061 mm.
Flt
ihe coun+erba lances
lnslde the body notlng
thelr
correct
posltlon.
The
counierba lance wlth
6-dot
on the
gear
ls
placed
hlgher on the
body.
Allgn
the
llne narks
on ihe
counterba lances
and
tl+
the
shäfis
In
posltlon
from
+he
slde of ihe
retalnlng
scrers. lihl
le lhe shaff ls
b€ln9
fltied
ln
posl+lon,
place
the ihrust
plalå
befeeen
thg
counferbalance
and
the body.
Tha
shaft
end ls
pressed
flush rlth fhe
body.
Appty
relalnlng
compound
(6909
lo0ll) oo the
sciei
threads
and tasfen
lhe
scrers.
2. Flt the coun+erbalance
assembly
In
place
so
lha-i'
+he dot on +he
counterbolanca
gear
allgns
wlih the dot
on
the
crankshaft
gear
rlm.
5. Tlghien the flxlng
screxs ot ihg counierba lance
nEchanlsm
lo
the toroue
of
ilt
ltl.
t4easure
the back
lash betroen ihg
cauntgrbalånce
gear
and the gear
rln.
Should l+ dlffar fron ratlng
(0,1...0,5
hr), make
the adjustmeni by
placlng
0,2
|Im
shlDs
beireen the body of
ihe
counierbalance
assembly and +he cyllnder block.
4.
Flx ihe lube ol
I
DlDe.
5. l'4ou
nt
fhe
englne.
1. Line
2.
Dot
t iminq marks
timing-ma1k
n
30
4-17