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24
Chapter
l-General
Engine
Overhaul,
Inspection,
and Repair
Fig. 30-Flywheel Runoul
Check
CAUTION: Do not hit
Ihe flywheel when removing
the ring
gear.
Heat the new ring gear
evenly
until
the gear expands
enough to
slip
onto the flywheel.
Make sure the gear
is
seated properly against the
shoulder.
CAUTION: Do not heat any portion
of the gear
10
a temperature higher
than 500·
F.
If thi. limit i.
exceeded,
the temper
will be removed from the ring
Fig. 31 -Ring
Gear Runoul
Check
I
I
A
vs
8
=
VERTICAL
TAPER
C
vs
D
""
HORIZONTAL TAPER
A
vs
C
AND
B
'vs
D
=
O
UT
Of ROUND
CHECK
FO
R OUT-Of-ROUND AT
EACH END
OF
JOURNAL
/
I
I
B
I
I
I
"
/
'-D
-+-+I
/
,-
I
,
I
\
I
'
I
I
I
\
\
I
I
"
~/
/
....
-~,.
Fig.
32-Cranksha"
Journal Check
6517
gear
teeth. When
the new ring
gear is in$lalled, p er ..
form a runout check
on
the ring
gear
and flywheel.
h.
Crankshaft.
Check the end play
for
conformance
to specification
in the following manner:
Push the crankshaft
toward the
rear of. the
engine.
Place a dial indicator
point against
the rear or
front
end
of the crankshaft
flange.
Set
the dial on zero then
push the crankshaft
forward.
Compare
the
reading on
the dial indicator
with
specifications.
(1)
CLEANING AND
INSPECTION.
R
emove
the
crankshaft, wash it
in
a solvent)
and
blowout the oil
passages with compressed
air.
Examine the
shaft
for
damage.
Measure the diameter of each
journal in
at
least four
places to
determine
out-of-roundness,
taper,
or under-
size condition
(fig. 32).
(2) REPAIRS. If the end play
is
excessive,
replace
the thrust bearing.
Replace
the
crankshaft if
it
shows
signs of failure.
Dress minor nicks or scratches.
If the pins or
journals
are
out·of·round beyond further
use, the shaft
should be
ground
for the next
undersize
bearing.
Calculate the
correct undersize bearing to be
used
as
fol1ows
:
EXAMPLE: If the
main bearing
journal will
"
clean;
up" before it
i.
gro
und to
2.499
·
0.010
=
2.489
inches
diameter,
finish it
to
that diameter,
and install
0.010 under&ize bearing •.
Always
reproduce the
same
radii in
the
corners of
the
journals that existed
originally, Too
small a
radius may
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