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Piston
maximum
diameter
subtracted from mi-
nimum cylinder diameter
gives
p
iston clearance.
If
beyond tolerance. hone cylinder to tolerance or
re-bore to
next
over-size and fit over-size
piston.
(Fig.
3-3-13)
Min.
Max.
Piston
0.0016
in.
0.0018 in.
clearance
(0.040mm.)
(0.045
mm.)
Maximum
0.004
in.
(0.1
mm.)
wear
limit
E.
Piston
rings
1.
Removal
a. Put your thumb at
each
end
of the
piston ring and
pull
the piston ring ends
apart.
Remove the ring
by
moving the ring off the piston at the
side
opposite the ring
ends. {Fig.
3-3-14)
b.
Remove
ring
expander from
top
and 2nd ring
grooves.
2
.
Maintenance.
a.
Check rings for
scoring.
If
any
severe scratches
are noticed. replace
set.
b.
Measure ring end gap
in
free
position. If beyond
tolerance, replace set. (Fig.
3-3-15)
Top ring
end
gap,
free
Approx.
0.30in.
(7.5mm.)
2nd
ring
end
gap, free
Approx.
0.16
in.
(4mm.)
72
Fig.
3-3-13
Fig. 3 -3-14
Fig.
3 -3-15
Le jeu du piston est la difference entre le
diametre
mi-
nimum
du
cylindre
et
le diametre
maximum du
pis-
ton. Si
cc
jcu n
'est
pas compris dans
les limites
speci-
fiecs,
roder le
cylindre
de maniere
a
obtenir
un
jeu
correct,
OU
rcnlcscr
le
cylindre
cooformement au
dinmc.1rc
du pi\ton
surproftlc
a
cote
immediatement
Sllf)Crtl'lllC
(l·11t.
3
J
13)
Min.
1 - -
Jcu
du
plNl011
0,01\0111111
1 - -
Li111ilc d'IINlll'C1
E.
Sc11rnc111
~ 11\-
1
ll•to11
I.
DclllUIIIUMl'
Max.
0,045
mm
0,
1
mm
a. Mcttrr Ir, pom
1•,
dr
d111quc cote
du
segment
de pis-
ton
cl
t11rr
trh11
u n •r~
nIrc111itcs.
(Fig.
3-3-14)
b.
Enlc11r1 1'1 ,tr11~rI11
1lr
,r11rncnt
dcpuis
les
rainures
du
hnul
cl
du
1
<' 1 111' ,rjlllll'llt
2.
E11Irct11•11
a.
Vcril1e1
It-~ qmIr11t
110111 l'uNurc. Si
des rayures
prulil11tl1·n 11111 1111I11lilr
ll'111I1lnccr
le jeu.
b.
Mcsi111·r
111
IrnI11
,I«•~
I1111Irnl\
llcmontes,
et
rempla-
ccr
le
11·11 111
11•1•11111111~
I
In
hu
!(Cur
de
In
fente
depa.sse
In l<llcrnnll1 (I
IM,
I I ,
,,
Jcu
lihrc
1\
In
n111p,
du
SCf-1111~111
hllpt•l
it'III
Jcu lihr~'. ,·,
111
t·1111p1•
du
2clll!l Nlll\llllllll
ll11v1ro11
7,5
mm
l !11vlron
4
mm
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