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1-36
GROUP
1-
ENGINES
FIG.
3S-Crankshaft
End Play
FIG.
40-Piston
Pin
Removal
W,o.","
INSERfS
.00
RETAINER
_
'.:::)
FIG.
39-Piston
and Connecting Rod Assembly
idle
and
check for oil pressure and
check
all
hose
connections and
gas-
kets
fo
r
leaks.
PISTON AND
CONNECTING
ROD REMOVAL
The
piston
and
connecting rod as-
sembly
is
shown
in
Fig.
39.
1. Drain the cooling system and
the crankcase.
Remove the air
cleaner,
then
tape the air horn closed.
Remove
the
cylinder
head,
oil
level
dip
stick,
crankcase
ventilation
tube,
fl
yw
heel housing inspection
cover,
oil
pan,
and
tbe
oil pump screen and
inlet
tube.
2.
Before removing the piston
as-
semblies, remove
a ny
ridge
and
/or
deposits
from the upper
end
of
the
cylinder bores. Move
the
piston
10
the
bottom of its
travel
and
place a
cloth
on
the
piston
head to
collect the
cuttings.
Remove
the
cylinder
ridge
with
a
ridge
cutler. Never
cut into
the
ring
travel area
in
excess of
1/32
inch when
removing ridges.
After
the
ridge has been removed,
remove
the
culler
from the
cylinder bore, then
turn
the
cra
nkshaft until
the piston
is
at the top
of its stroke and
carefull
y
remove
the cloth
with the cuttings.
3. Turn
the
crankshaft until
the
connecting
rod
being
removed
is
down.
Remove the
hex
head nUlS
from the connecting
rod
bolts.
Pull
the
cap
off the rod,
then push
the rod
and piston
assem bly
out
the
top
of
the
cylinder
with
the handle
end
of a
hammer.
Avoid
damage
10
the
crank-
pin
or the
cylinder wall
when remov-
ing the
piston.
4,
If
new piston
rings
arc
to be in-
stalled and
the
cylinder
has not
been
refini
shed,
remove
the glaze
fro
m
the
SI'RING
SI'ACER
OIL
RING
ASSEMBLY
~
STEEL RAILS
COMI'RE~ION
RINGS
1079_11
cylinder wall by passing
a
fine grit
hone
or
glaze
removal
1001
Ihrough
the
bore
a
few
times.
Take all
the
necessary
precautions to
catch
the
grit. Do
not
hone
mo
re
than enough
to
rough up
the
finish.
Thoroughly
clean
the
cylinder
walls
and
the block
after the
glaze is removed,
then
oil
the
walls.
5. Repeat the
above
procedure
on
each
assembly.
PISTON AND
CONNECTING
ROD DISASSEMBLY
Mark
the
pistons and
pins
to assure
assembly
with
the
same
rod
and
in-
stallation
in
the same cylinder
from
which
they
were
removed.
Remov·
the
piston rings.
Remove
the
pisto
pin
retainers,
then
drive
the
pin
out
of
the piston a
nd
rod (Fig.
40).
Dis-
card the retainers.
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