Valmet 309 - Repair Instructions: Crankcase; A. REMOVING THE CRANKSHAFT; B. CHECKING THE CRANKSHAFT; REPLACING THE CRANKSHAFT GEAR RIM (411 engines)

REPAIR
INSTRI'CT
I OI{S
CR^NKCASE
I.
CRANKSHÅFT
A. REMOVINO
THE
CMNKSMFT
l. ReDove
ilp ol
I sumo.
2.
Losen the
connec+lng
scre$
ot
ihe lube
ol
I
plpe
of
the
countorba lance
m€hanlsm
troo ihe
cyllnder
block
os rell
as the reialninq
scrors
of
th€
counierbal6nce
mechanlsm.
Rem;ve
+he
coun+erbalance
mechanlsn
and ihe lube
ol I
olo€
(41|
engl nes
l.
f.
Loosen
the
flxlng
screys
of ihe ol
I
pump
pressuro
plpo
trom
lhe
cyllnder block
and iho
ol I
pump
reialnlng
screus.
Removs ihe
oll
punp
and the ol
I Iniako
and
pressur€ plpes.
4.
L@sen
ih€ flywheel
rstalnlng
scrows and r€move
the flyHheel,
Thon
loosen
ihe flyrheel
houslng
llxlng
screws
ond renbve
the
houslng.
5. Renrove
ihe gear
houslng
(
Instruc ons,
polnt
5).
Loosen fhe
nuts/sc.eis
ol
ihe
connecllno
rod
bearlng
caps,
qemove
the
caps and
push
the
conneciing
rods
so tar dorn +hat
they wlll
not
pr€vent
you
from
removing +he
cr6nkshafi.
Loosen the
retalnlng
scrers
ot the naln bearlng
caps and reirove
the caps.
Llft
fhe crankshafi
ofl from
lts
posltlon.
CIfCKING
THE
CR^iIKSHAFT
vJösh
+he
c.ankshoft carefully
6nd ensure ihaf
C.
the oi
I channels
are
clean.
Max pgrmlsslble
cleorance In ih6 maln beorlng
ls
0rl8 |'n
and
ln the bl9 end b€arlng
0,14
rn. lf
ne€ded,
th€
journals
must bo
ground.
llhsn
grlndlng
fol low the stondard
underslzes
and
use underslzed bearlng shells
supplled
es spare
ports,
see
+echnlcal doia,
polnt
crlnkshaft.
lhen
grlndlng
not€ that the
Journll
ådgos must
renåln round.
REF.ÄCI
NG
TIf CRA KSI{AFT
G€AR RIM
(41|
englncs)
Mark
ihe
posltlon
of
fhe
gear
rln
on the
crank-
sh
af t.
2. He6t
the rlm
evenly, for
example
rlth
o
gas
torch,
and tap off
the rlm
wllh
o sultoble
dr
I
lt.
46
M6ösure
fhe
journöl
rear and
ovolness
yil+h
a
mlcrome+er.
Pertorm
the
measuremen+ crosswlse
ai
sgveral
polnts
of thg
journal.
The
Jo'lrnal
ov6lness
or
o+her delormlty
oay noi exceed
+he
llmlf
O,of
rm.
4-9