4.
424
Fl+ lhe
plston
rlngs
uslng
the rlng
pllers.
Ensure
+hai ihe
rlngs are flffed
ln
+helr
correct
places
and +hai lhe marklng TOP or
+he nanufac+urerrs marklng
In
ihg rlngs ls
upld
ards.
I NSPECT
ING
THE
PISTON
425
H.
F ITT
II{G
THE PISTON PIN
426
Heat ihe
plston
evenly to a tempera-fure of
l00ct.
Flt
+he connectlng
rod Into the
pls+on
and
press
ihe
pls+on pln
Info l+s
poslllon.
Noie
I The combus+lon chamber of +he
Dlslon
and and the ordlnal
nurnber on the connectlng
rod
musi
face In ogDoslie dlrectlons.
Fli
the
pls+on pln
clrcllps In ihe
pls+on.
Ensure +hat
+he clrcllps engage
properly
In
ihelr grooves.
SHORTET€D
P
ISTot{S
lf l-he
cyllnder block top face has b€en
machlned,
lns+al I respecflvely
shortgr
pls+ons
+o ensure +he
correci dlstance betwsen +he
plston
head
and
cyllnder
head.
Always replaco
all ihe
pls+ons
ln one englne to
have
ldenllcal
plsj-ons.
Max
permlsslble
relght
dlf{erence
be+reen pls+ons
In
one englne ls 25
g.
There are flve
dlfferenl
underslzes
ln +he
lengihs
of
ihe pls+ons
dellvsred as
spare
par+s
for
3ll,4ll
and 6ll englnes. The
correct
length
can be chosen accordlng
to
+he ne€d Jor
machlnlng.
ln the
case of f09 and 612 englnes
+he
s+andard
plston
rnust be shor+ened +o
correspond to ihe
cyllnder bl€k machlnlng.
t.
Piston diameter
Engine
A
gD
309
26
99,873...99.887
311
4tI
61
1
19
107,853...107,867
612
22 107,8s3...102867
Check
+he
condltion
of ihe
plsfon
and the
pls+on pln
vlsually. Pay speclal attenilon to
posslble
cracks ln +he area of the
plsion
top
and the
pln
bore.
Measure +he
plsfon
dlamo+er
a+ the
polni
Indlcaied
In flg. 4
25.
Coopare
ihe resuli
'.ilih
the railng and replace the
pls+on
',ilth
a
new one,
if
necessary.
427
4-15
To Next Page
Loading...
