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1-24
GROUP 1- ENGINES AND EXHAUST SYSTEMS
FIG.
42-Pislon Ring Gap
2.
Position the
ring in the
cylinder
bore in which it
is
going
to
be
used.
3.
Push
the ring
down
into the
bore
area where
normal
ring wear is
not
encounter
ed.
4.
Use
the
head of a
piston to
posi
tion the ring in the
bore
so
that
the
ring
is sq
uare with the
cylinder
wall
.
Use
ca
uti
on
to
avoid dam
age to
th
e
ring
or
cylind er
bore.
5.
Measu
re
the
gap
between
th
e
e
nd
s
of the ring with a fee
ler
gauge
(F ig. 42).
If
the
ring gap
is
less
th
a
n
th
e
recommended lower
lim it,
try
another
ring
set.
6.
Check
the
ring
side
clea rance
of the compression
rin
gs
with
a feeler
gauge
in serted
be twee
n
the
ring
a
nd
its
lower
land (Fig.
43).
The
gauge
should slide
freely around the entire
ring
circumfe rence without
binding.
An
y
wear
th at
occurs will
form
a step
at the
inner
port
ion of
the
lower
land.
If
the
lower
lands
have
high
steps,
the
piston
should
be
replaced.
Fitting
Piston
Pins. The piston
pin
fit should
be a
li
ght
thumb press fit
at
norma
l
te mpera
ture
(70°
F). Sta
nd
ard
piston
pins
are color coded
green.
Pins
of
O.OOI
-in
ch
oversize (coded
FIG.
43-Pislon Ring Side
Clearance
BRIGHT
(POLISHED)
SECTIONS
IMPROPER
SEATING
TAPERED
JOURNAL
RADIUS
RIDE
FATIGUE FAILURE
FIG.
44-Typical Bearing Failures
blue)
and O.002-
inch overs
ize (coded
ye
ll
ow)
are
avai
lab
le.
If
the
pi
n
hole
in the piston
must
be
reamed,
use a
n
expans io
n-type,
pilo
ted
reamer.
Place
the reamer
in
a vise and revolve
the piston
aro
und
the
reamer. Set
the
reamer
to the
size
of
th
e
pin
bo
re,
then
expand
th
e
reamer
sli ghtl
y
and
tr
ial ream
the pin
bore. Take a
li
ght cut. Use a
pilot
sleeve of
the nea rest
s
ize
to main
-
tain
alig
nment
of
the
bores.
C
heck
th
e
hole
size,
using the
new
piston pin
.
If
the
bore
is
small, ex-
pand the reamer
slightl
y
and
make
another c
ut. Repeat the
procedure
until
the proper
fit
is
obtained
.
C heck
the pisto
n pin for
fi
t
in the respec tive
rod bushing.
If
necessary, rea
m
or
hone
the
bus hing to fit the
pi
n.
Insta
ll
th
e
piston
pin
in
the
piston
an
d
rod. Insta
ll
a
new
re
tainer
at
each
e
nd
of
the pin
to hold
it in
place. Spira
l
th
e retai ners
into posi-
lion with the fingers.
Do not
u
se
pli
ers.
Mak
e sure
th
e
retainers
arc
pro perly sea
ted in their
grooves.
MAIN
.~ND
CONNECTING
ROD BEARINGS
CLEANING AND
INSPECTION
C lean
the bearing
insc
rts and
caps
thoro ughly.
In
spec
t each
bearin
g
carefully.
Bearings
that
h
ave
a
sco
red.
c
hipped, o
r
wo
rn
surface
should
be
repl aced.
T yp ical
ex-
amp les
of bearing fa ilures
a nd
their
causes
are
shown
in Fig. 44.
The
copper
lea
d
bea
ri
ng base
may
be
visib le thro
ugh
the
be aring
ove
rl
ay
.
Thi
s does
not
mca
n that
the bearing
is
worn.
D
o
not
rep
lace
the bea
rin
g
if
the
bearing clearance is
within
rccommcnded
lim
its.
Check the c lear-
a nce
of bearings
th
a
t
appcn
r
to be
sat isfac
tory
with
P
lastigage.
Fit new
beari ngs fo llowi ng
the
reco
mm
e
nded
proced
ure
(Part
1-2,
1-3.
o
r
1-4).
A 1
021-A
FL YWHEEL-MANUAL-SHIFT
TRANSMISSIONS
INSPECTION
Inspec
t
the
fl ywhee
l
for c racks, heat
c heck, or
othe
r dcfects
tha
t woul
d
make it
u
nfi
t for
further
service.
Machine the
fri
c
ti
on surface
of
th
e
fl
yw hee
l if it is
scored or
worn. If
it
is necessary
to remove more
th
an
0.045
in
ch of
stock from the
orig
in
al
th
ickness, rep lace
th
e
flywheel.
I
nspec
t
th
e
ring
gear fo
r
worn
,
c
hipped,
o
r
c racked
teeth.
If
the
teet
h
a
re
damaged
, rep lace
the ring
gear.
With
the
flywhee
l
insta
lled on the
crankshaft,
c heck the
flywheel face
run
out.
FLYWHEEL FACE RUNOUT
Insta
ll
a di
a
l
indicator
so
that
the
indica to
r
po int bears
agai
nst the
fl
yw
hee
l
face (Fig. 45).
Turn
the
fl
ywhee
l
making sure
that
it
is full
forward
or
rearward
so
tha
t
c ra
nk-
shaft e
nd
play
wi
ll
not be indicated as
fl ywh
ee
l
run
out.
RING
GEAR
REPLACEMENT
H
ea
t
the defective
rin
g
gear
with
a
b
low
to rc
h
o
n
the
eng ine
side of
FIG.
45-Flywheel Face Runoul
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