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22
Chapter I-General
Engine
Repair
7. FLYWHEEL,
CRANKSHAIT, MAIN
BEARINGS, AND
CONNECTING
ROD BEARINGS
Procedures
for
t he
inspection
a
nd
repair
of these
components are
conta
ined
in the following paragraphs.
a. Flywheel.
The
flywheel
a
nd
ring gear
are a
shrink
fit
and are
repla
ceable as
separate
parts.
(1)
INSPECTION.
Check
the flywheel
face
run-
out
with a
dial
indicator (fig. 30).
If
the
runout
ex-
ceed.
O.OOS-inch, remove
the flywheel
,
and
check
the
runout
of
the crankshaft mounting
flange.
It
will be
necessary
to
remove
the
crankhaft
if the flange requires
machining.
Inspect
the ring
gear
for worn,
chipped,
or cracked
teeth.
Check
the ring
gear
run
out
as indicated
in
fig.
3
1.
(2)
REPAIRS.
If
the
flywheel
runout
exceeds
O.OOS-inch
a
nd the
flange is not at
fault,
the
flywheel
should
be
replaced
or
m
ac hined.
Machine the friction
surface of the
flywheel
if
it
is scored.
If
it is necessary
to remove
more
than O.04S-inch of
stock
from the
original thickness, the
flywheel should
be replaced.
If
the
ring
gear
teeth
are chipped,
broken,
cracked,
or
worn, or
if
the
runout
exceeds
O.OIO-inch,
replace
the
ring
gear
as
follows
:
Heat
the
defective
ring
gear
with a
blow
torch on the
engine
side
of the gear, then
knock
it off the
flywh eel.
CAUTION: Do not hit th
e
flywheel
when
remo vin
g
th
e
ring gear.
Fig
.
30-Flywheel Runoul Check
H
eat
the new ring gear
evenly until
the
gear ex-
pands
enough
to
slip
onto
the
flywheel
,
then position
the gear
on the
flywheel.
M
ake
sure
the
gear
is
seated
properly against the shoulder.
CAUTION: Do
not
heat
allY
portion of the
gear
to
a tem,perature
higher
than 500
0
F.
If
I.his
lim.il.
is
ex-
ceeded,
the temper
will
be rem.oved front the
ring gea
r
teet./". JPhen
the
n
ew
ring
gear is installed
perform,
a rUllout
check on
the ring
gear
and flywheel.
h.
Crankshaft.
(1) CLEANING AND
I
NSPECTION.
Before
the
crank-
shaft
is
removed,
check
the
end play for
conforma
nce to
specifications
using
indicator
in the following manner:
Push
the crankshaft
toward
the
rear of
the engine.
Place a
dial indicator against
the
rear side of
the
crankshaft
flange.
Set the
dial on zero
then push
the
crankshaft
forward.
Compare
the
r
eading
on the dial
indicator with
specifications.
After
removing the crankshaft, wash
it
in a solvent,
and blowout
the
oil
passages
with
compressed
air.
Examine
the shaft with a magnifying glass for cracks
or
other signs
of
failure.
M easure
each crankpin and
journal
diameter
for
con-
formance
to
specifications.
Check
the
shaft for
proper
taper
and
out-of-roundness
a
t
several places around
the
circumference.
,
•
6084
Fig.
3J-Ring Gear Runoul Check
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